Journal articles: 'Mud pumps'

1

Bejger, Artur, and Tomasz Piasecki. "The Use of Acoustic Emission Elastic Waves for Diagnosing High Pressure Mud Pumps Used on Drilling Rigs." Energies 13, no. 5 (March 3, 2020): 1138. http://dx.doi.org/10.3390/en13051138.

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Although mud pumps are vital components of a drilling rig, their failures are frequent. The identification of technical condition of these high-pressure piston pumps is difficult. There are no reliable criteria for the assessment of mud pump condition. In this paper, faults of the pump valve module are identified by means of acoustic emission (AE) signals. The characteristics of these signals are extracted by wavelet packet signal processing. This method has been verified by experiments conducted on a NOV (National Oilwell Varco) -made triplex 14-P-220 mud pump (mounted in the drillship). The results show that the wavelet packet signal processing method can effectively extract the frequency band energy eigenvalues of the signals. Besides, some operational problems associated with high pressure piston mud pumps are presented. A non-invasive method for diagnosing the technical condition of such pumps is being developed at the Maritime University of Szczecin.

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Pekin, S. S., A. V. Bulat, V. A. Slyshenkov, and V. V. Mekhov. "Drilling mud pumps with rack gear." Proceedings of Gubkin Russian State University of Oil and Gas, no. 3 (2019): 71–79. http://dx.doi.org/10.33285/2073-9028-2019-3(296)-71-79.

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Nikiforova, S. M., M. A. Filippov, and A. S. Zhilin. "Heat Treatment of Wear Resistant Steels for Mud Pumps." Materials Science Forum 870 (September 2016): 181–84. http://dx.doi.org/10.4028/www.scientific.net/msf.870.181.

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Influence of different type heat treatment including high temperature quenching on wear resistance has been investigated. The two investigated steels are widely used in production of mud pumps. It was shown that Kh12MFL had better wear resistance in comparison with 150KhNML. Martensitic-carbide structure of the steels formed by quenching from high temperatures (900 – 1000 °С) induced good hardness (61 – 64 HRC). Analysis of the residual austenite contents influence on wear resistance was also made. It was determined that residual austenite formed after high temperature quenching (900 – 1000 °С) was metastable and had tendency to transform into carbon containing martensite of deformation. This allowed steels to have maximum wear resistance because of providing high abilities to friction hardening of the work place of the sample.

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Kozhevnikov, N. N., and L. N. Neitman. "Development and introduction of sealing rings in mud pumps." Hydrotechnical Construction 20, no. 9 (September 1986): 533–36. http://dx.doi.org/10.1007/bf01434188.

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Zhang, Xi Xi, Yu Jing Jia, and Guang Zhen Cheng. "The Water Sump Cleaning Machine by Vacuum Suction." Applied Mechanics and Materials 201-202 (October 2012): 785–88. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.785.

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This article describes a vacuum water sump cleaning machine which is used to clean up coal mine water sump. Cleaning machine is composed of mechanical structure and electrical control devices. The parts of machine are made up of Walk the flatbed, storage mud tank, vacuum pumps, suction pipe, mud tubes, swing devices, control valves, suction pipe and pressure tracheal. When working, under the function of vacuum pumping, cleaning machine pulls out the vacuum from storage mud tank through the vacuum air feeder. As the vacuum level in the tank is increasing, under the function of atmospheric pressure outside world, the mud flows into the reservoir along the suction tube. When storage mud tank is full, vacuum pump automatically shut down. Turning off the vacuum valve and opening the pressure valve, the slime in the tank under the function of compressed air comes into the mine car through the row mud tube. The layout of this cleaning machine is reasonable, what is more, it is flexible and convenient to operate, so that it reduces the labor intensity significantly and improves the work efficiency of the clearance.

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Shangareev, R. R. "Assessment of professional risks in the operation of mud pumps." IOP Conference Series: Materials Science and Engineering 905 (August 26, 2020): 012087. http://dx.doi.org/10.1088/1757-899x/905/1/012087.

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Concli, F., and C. Gorla. "non-newtonian cfd modelling of a valve for mud pumps." International Journal of Computational Methods and Experimental Measurements 8, no. 1 (January 1, 2020): 61–69. http://dx.doi.org/10.2495/cmem-v8-n1-61-69.

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Ogorodnikov, S. P., I. I. Mikheev, and A. E. Kulakov. "Optimization of the mud intakes of dredges with submersible pumps." Hydrotechnical Construction 21, no. 7 (July 1987): 432–36. http://dx.doi.org/10.1007/bf01427276.

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Mohamed Iyad Al, Naboulsi, Niculae Napoleon Antonescu, Alin Dinita, and Marius Morosanu. "Tribological Characterization of Some Elastomers Used at Progressive Cavity and Piston Pumps." MATEC Web of Conferences 318 (2020): 01016. http://dx.doi.org/10.1051/matecconf/202031801016.

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The progressive cavity pump (PCP) is a positive displacement pump, consisting of a polished helical-shaped rod (rotor) turning inside a helical elastomer (stator). PCP has many advantages, but the pump durability is manly limited by elastomer behavior. At piston pumps (PP) used for drilling mud piston has an elastomer sleeve that also limit the durability. Standards like ISO 15136.1 & 2 for pumps developed by manufactures and users’ committees provides requirements for design, quality design verification etc., but do not define specifically the elastomer for the stator or the metal used for the rotor. Each PCP and PP manufacturer used specific materials at pump construction. The aim of this study was to evaluate the tribological behavior of some elastomers such polybutadiene rubber (BR), polybutadiene acrylonitrile rubber (NBR), polybutadiene acrylonitrile carboxylate (XNBR) and polyamide (PA 6) in couples with hard chromium coated steel, nitride steel and cast iron. Were determined friction coefficients and wear on 2 types of friction couples (plane to plane and shoe to plane) on two tribometers and some mechanical proprieties (Young’s modulus, ultimate tensile strength, elongation, hardness).

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Mok, S. H., and D. G. Gorman. "Using Taguchi Experimental Design to Investigate Operating Variables That Significantly Affect Wear in Mud Pumps." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 209, no. 1 (March 1995): 29–40. http://dx.doi.org/10.1243/pime_proc_1995_209_403_02.

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Maintenance of offshore drilling mud pumps is normally based on running hours. It is generally accepted, however, that time does not provide an accurate means of scheduling maintenance, given the varying operating conditions of the reciprocating mud pumps. The energy expended at the interaction of sliding surfaces is hypothesized to be a better alternative. The effects of operating variables on wear rates are investigated. A Taguchi experimental design was used to identify those factors that significantly affect wear. Within the confines of an experimental test rig, the normal load and abrasive sand content was found to have a significant effect on the specific wear rate of nitrile rubber sliding on steel in drilling fluid.

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Isakaev, E. Kh, V. B. Mordynskii, A. S. Tyuftyaev, Yu M. Avilkin, and V. A. Katarzhis. "Increasing the service life of rapidly wearing components of mud pumps." Welding International 26, no. 1 (January 2012): 40–44. http://dx.doi.org/10.1080/09507116.2011.592711.

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Cheng, Xuejing, Tianyu Gao, Shaofeng Ru, and Qian Cong. "Wear Performance of Bionic Dimpled-Shape Pistons of Mud Pump." Advances in Materials Science and Engineering 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/8256429.

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The piston is one of the parts that most easily become worn out and experience failure in mud pumps for well drilling. By imitating the body surface morphology of the dung beetle, this paper proposed a new type (BW-160) of mud pump piston that had a dimpled shape in the regular layout on the piston leather cup surface and carried out a performance test on the self-built test rig. Firstly, the influence of different dimple diameters on the service life of the piston was analyzed. Secondly, the analysis of the influence of the dimple central included angle on the service life of the piston under the same dimple area density was obtained. Thirdly, the wear of the new type of piston under the same wear time was analyzed. The experimental results indicated that the service life of the piston with dimples on the surface was longer than that of L-Standard pistons, and the maximum increase in the value of service life was 92.06%. Finally, the Workbench module of the software ANSYS was used to discuss the wear-resisting mechanism of the new type of piston.

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Meakhail, Tarek, and Ibrahim Teaima. "Experimental and numerical studies of the effect of area ratio and driving pressure on the performance of water and slurry jet pumps." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 9 (November 29, 2011): 2250–66. http://dx.doi.org/10.1177/0954406211430458.

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The slurry jet pump with scouring nozzle system can be used in dredging of sites, which are difficult to access or need handling of equipments that are used for the intake of pumping stations under bridges and concrete water channels. This system is suitable for sand, silt, sludge, mud, and other organic materials. The aim of this study is to investigate the performance of water and slurry jet pumps. The effects of the pump-operating conditions and geometries on its performance were investigated. The experimental rig was constructed in such a way that the driving nozzle diameter can be changed. In this study, three different diameters of driving nozzles, 10, 12.7, and 16 mm, have been used with one mixing chamber of 25.4 mm diameter (i.e. three different area ratios of R = 0.155, 0.25, and 0.4). Also, the effect of driving pressure has been investigated. The results show that increasing the area ratio decreases the maximum mass flow ratio. The results of computational fluid dynamics were found to agree well with actual values obtained from the experimental water and slurry jet pump.

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Mok, S., and D. G. Gorman. "Investigation of Factors Affecting Wear Characteristics in Rubber–Metal Sliding Contact." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 209, no. 2 (June 1995): 137–43. http://dx.doi.org/10.1243/pime_proc_1995_209_416_02.

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This paper examines the correlation between volumetric wear loss and the energy expended at the interface of nitrile rubber sliding on steel in the presence of drilling mud and abrasive sand. The measurement of energy expended at the material interface is investigated as an alternative for monitoring the extent of wear damage due to operating conditions. This is contrasted with running hours, as is typical of reciprocating mud pumps used in oil and gas drilling operations. It is found that increased deterioration and wear loss resulted from the combined effects of load and sand. The volumetric wear loss was found to increase at the rate of 16.8 per cent per 1 per cent sand and is specific to the type of sand used and the test configuration employed.

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15

Nikiforova, S. M., M. A. Filippov, G. N. Plotnikov, A. S. Zhilin, and S. V. Belikov. "HEAT TREATMENT OF WEAR RESISTANT STEELS FOR DRILLING RIG PUMPS." Oil and Gas Studies, no. 4 (August 30, 2015): 116–20. http://dx.doi.org/10.31660/0445-0108-2015-4-116-120.

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The influence of heat treatment different options on wear resistance of steels of trademarks Kh12MFL and 150KhNML applied in manufacturing of mud pumps is reviewed. It is shown that the steel Kh12MFL is superior in wear resistance than the steel 150KhNML at abrasion. The martensite-carbide structure of both steels obtained at quenching at normal temperatures, from 900 to 1000 0С, ensures a good hardness (61-64 HRC). The analysis of the residual austenite contents influence on wear resistance was also made. It was determined that residual austenite formed after high temperature quenching (110-1170 0С) was metastable and had a tendency to transform into carbon containing martensite of deformation in the process abrasive wearing. This allowed steels to have a maximum wear resistance because of ensuring a high ability to frictional hardening of the working surface.

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Filippov, M. A., M. A. Gervasyev, G. N. Plotnikov, S. M. Nikiforova, and A. S. Zhilin. "THE USE OF CARBON, HIGH-CHROMIUM STEELS FOR LINERS OF MUD PUMPS AND DRILLING RIGS." Oil and Gas Studies, no. 3 (July 1, 2017): 135–42. http://dx.doi.org/10.31660/0445-0108-2017-3-135-142.

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The paper shows that high temperature heating (from 1 100 to 1 170 0C) for the subsequent quenching of high-chromium steels of a martensitic-carbide class 95X18 and X12MFL provides structure to the metal base, which consist of high-carbon containing martensite and residual metastable austenite with some carbides. The resulting structure has a high capacity for frictional hardening. Experiments with cold processing treatment of the analyzed steels also showed that after high-temperature quenching with subsequent cooling to -70 0C, sufficient cooling martensite is formed, which in combination with residual metastable austenite, provides an increase of abrasive wear resistance by 25 % compared to high temperature annealing.

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Al-Ghamdi, Rasha A., and Husin Sitepu. "Characterization of Sludge Deposits from Refineries and Gas Plants: Prerequisite Results Requirements to Facilitate Chemical Cleaning of the Particular Equipment." International Journal of Corrosion 2018 (September 2, 2018): 1–8. http://dx.doi.org/10.1155/2018/4121506.

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In this paper, the method developed by the authors to separate the inorganic materials from the hydrocarbon of the sludge deposits, which is fast and can accurately identify very small quantities of inorganic materials, has been extended to characterize the 12 types of sludge samples collected from (a) a regeneration overhead acid gas condenser, (b) water draw-off pump’s suction strainer in a gas plant, and (c) condenser, inside vessels of inlet head, and head coiler tube equipment at gas plants. The results revealed that the major phases are (a) iron sulfide corrosion products with the hydrocarbon type of mixture of diesel and lube oil for a condenser and (b) carbonate scale in the form of calcium carbonate with the hydrocarbon type of lubricant oil for sludge deposits from a suction strainer for pumps, and drilling mud in the form of barium sulfate with no organic hydrocarbon or polymer for sludge samples from a water recycling pump. Moreover, the major phases for inorganic materials built up in a condenser, inside the vessel’s inlet head, and the head coiler tube revealed that iron oxide corrosion products are found in the steam drum, and iron sulfate corrosion products are built up in the condenser. The presence of dissolved oxygen in the boiler feed water is indicated by a high wt% of iron oxide corrosion product in the form of magnetite (Fe3O4), which appeared in the inorganic materials built up in the condenser steam drum. Knowing accurately which phases and their wt% were involved in the inorganic materials can guide the field engineers to facilitate efficient cleaning of the equipment by drawing up the right procedures and taking preventive action to stop the generation of those particular sludge deposits.

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Tirmizi, Syed Talha, Syed Rizwan Ul Haq Tirmizi, and Syeda Amara Tirmizi. "Mid-FTIR and Atomic Absorption Spectroscopy Based Evaluation of Oxidation Tendencies of Lubricating Oils for Effective Oil and Gas Operations." International Journal of Heat and Technology 38, no. 3 (October 15, 2020): 673–81. http://dx.doi.org/10.18280/ijht.380311.

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Lubricants help combat an array of challenges posed during both onshore and offshore operations including in the application of thrusters, mud pumps, mud agitators, drive systems, lifts/hoists systems etc. The evaporation loss of lubricating engine oil can significantly impact the engine’s performance and emissions, by thermal degradation and corrosion. The present research focuses on challenges arising due to oxidation of lubricating oils used in different machinery by implementing thorough quantitative analysis. The interferometry was adopted to test oil samples and infrared rays were resolved into its component wavelength relative to associated functional group such as C=O and O-H groups. The frequency domain was retrieved from interferometric data by Fourier transformation with the help of FTIR (Fourier Transform Infrared Ray) spectrometer. To comprehensively understand the wear and tear process inside the peripheries of the engine, atomic absorption spectroscopy (AAS) was used for determination of metals concentration. The changes in physical and chemical properties of oil samples were discussed to retrieve useful interpretations including percentage of wear and tear was found to be 15.2% at 3000 engine running hours. The research concluded by addressing the potential impact of oxidation by-products on the lubrication performance which ultimately influence the efficiency of the oil and gas upstream operations. The research inferred to contribute towards establishing a relative deterministic approach for predicting the oxidative tendencies of lubricating oils whilst keeping in view its physical characteristics.

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Liu, Shujie, Xiangfang Li, Tengfei Sun, and Hui Zhang. "Calculation of the Hydraulic Extension Limit of an Extended-Reach Well with Allowance for the Power Limitations of the Available Mud Pumps." Chemistry and Technology of Fuels and Oils 51, no. 6 (January 2016): 713–18. http://dx.doi.org/10.1007/s10553-016-0662-9.

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Karmadi, Ketut Agus, I. Wayan Redana, I. Nengah Simpen, Mawiti Infantri, and Bambang Soenarto. "DRILLING GROUNDWATER FOR RAW WATER IN SEMBIRAN VILLAGE,TEJAKULA DISTRICTS, BULELENG REGENCY." International Journal of Engineering and Emerging Technology 5, no. 1 (July 27, 2020): 24. http://dx.doi.org/10.24843/ijeet.2020.v05.i01.p14.

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ABSTRACT- Water is an absolute necessity that must be met, both for drinking water and for irrigation. An alternative to meet the water needs other than rainwater or surface water, is by taking underground water by drilling deep wells. Sembiran Village is a village located in Tejakula District, Buleleng Regency, the village is a dry area that requires water, both for drinking water and for agriculture. Location of groundwater drilling including Tejakula groundwater basin. In order to achieve the above objectives, an effective and efficient groundwater drilling technique should be carried out considering that the area geologically has rocks dominated by volcanic lava rock which are the products of Mount Agung and Mount Buyan Beratan Purba. The method of drilling groundwater is carried out in stages starting from drilling a Pilot Hole with a diameter of 6 to 64 meters, followed by an enlargement of 8 ", 10" to 12 "drill holes to a depth of 64 meters. In the field of drilling work the Hydrolic Rotary System Method, Direct Circulation Rotary Drilling is used and for the removal of cutting / dirt mud Fludia is used. The equipment used for drilling is rotary / skid mounted drilling machines with a capacity of up to ± 150.0-200.0 meters, equipped with equipment such as: mud pumps, a series of equipment that cannot be separated from one another. For well logging an Electrical logger is used for geophysical wellbore investigations. For the work of washing wells using compressor and other supporting equipment. Pumping the test uses a submersible pump that has a minimum discharge capability of 10 lt / sec and a maximum of 20 lt / sec. The results of direct observations and measurements of the physical parameters of the Sembiran Village Drilling Well (SEM-5) contain TDS = 219.; PH = 7.0. Chemically, Iron (Fe) = 0.001 mg/ltr; Arsenic (Ar) = 0.067 mg/ltr; Availability (CACO3) = 56.4 mg/ltr; Chloride (Cl-) = 91.6 mg/ltr; Nitrate (N) = 0.013 mg/ltr; Sulfate (SiO4) = 1.88 mg); Lead (Pb) = 0 mg/ltr; organic matter (KMnO4) = 0.34 mg/ltr, so the Drilling wells (SEM-5) meet clean water quality standards based on the Regulation of the Minister of Health of the Republic of Indonesia Number 492 / Menkes / Per / IV / 2010. Discharge obtained from pumping test results at SEM-5 wells is 20.47 liters/sec with surface water level(swl) = 23.60 m, and the position of the pump is placed at 42 m from the ground surface.

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Kandel, D., R. Quagliaroli, G. Segalini, and B. Barraud. "Improved Integrated Reservoir Interpretation Using Gas While Drilling Data." SPE Reservoir Evaluation & Engineering 4, no. 06 (December 1, 2001): 489–501. http://dx.doi.org/10.2118/75307-pa.

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Summary The acquisition of gas in mud data while drilling for geological surveillance and safety is an almost universal practice. This source of data is only rarely used for formation evaluation because of the widely accepted presumption that it is unreliable and unrepresentative. Recent developments in the mud-logging industry to improve gas data acquisition and analysis have led to the availability of better quality data. Within a joint Elf/Eni-Agip Div. research program, a new interpretation method has been developed following the comprehensive analysis and interpretation of gas data from a wide range of wells covering different types of geological, petroleum, and drilling environments. The results, validated by correlation and comparison with other data such as logs, well tests, and pressure/volume temperature (PVT) data, enable us to characterize lithological changes; porosity variations and permeability barriers; seal depth, thickness, and efficiency; gas diffusion or leakage; gas/oil and hydrocarbon/water contacts; vertical changes in fluid over a thick monolayer pay zone; vertical fluid differentiation in multilayer intervals; and biodegradation. The comparison of surface gas, PVT, and geochemistry data clearly confirms the consistency between the drilling gas data (gas shows) and the corresponding reservoir fluid composition. The near real-time availability, at no extra acquisition cost, of such data has led to:The optimization of future well operations (such as logging and testing).A better integration of while-drilling data to the well evaluation process.A significant improvement in both early formation evaluation and reservoir studies, especially for the following applications, in which traditional log analysis often remains inconclusive:Very-low-porosity reservoirs.Thin beds.Dynamic barriers and seal efficiency.Low-resistivity pay.Light hydrocarbons. Examples show gas while drilling (GWD) wellsite quicklook interpretations with simple lithological and fluid interpretations, as well as more complex reservoir and fluid characterization applications in varied geographical and geological contexts; both demonstrate how GWD data are integrated with more standard data sets. Introduction The measurement of gas shows is standard practice during the drilling of exploration and development wells. Continuous gas monitoring sometimes enables us to indicate, in general terms, the presence of hydrocarbon-bearing intervals, but it rarely allows us to define the fluid types (oil, condensate and/or gas, and water). Gas data are at present largely underused because they are considered unreliable and not fully representative of the formation fluids. There are many reasons for this. On one hand, poorly established correlations exist between reservoir fluids and shows at surface; on the other hand, numerous drilling parameters strongly influence the recorded gas data, such as formation pressure, mud weight and type, gas-trap position in the shaker ditch, and mud-out temperatures. One reason may be the very low cost of such data, often equated with low value. Until a few years ago, the analysis performed on gas shows was generally restricted to the use of Pixler and/or Geoservices diagrams (or equivalent), wetness, balance, character, and gas normalization.1–4 Recent improvements in gas-acquisition technology and the new GWD methodology allow us to perform reservoir interpretation in near real time for fluid identification and contacts [oil/water contact (OWC), gas/oil contact (GOC), etc.], lithological changes, and barrier efficiency, thus allowing operations optimization (e.g., coring, wireline recording and sampling, and testing operations). It is also possible to integrate the GWD interpretation in reservoir, geochemical, PVT analysis, and comprehensive studies. Method Data Acquisition. The measurement of gas shows in the circulating drilling mud was introduced in the early days of mud logging (ML) with two objectives: first, as a safety device to indicate well behavior to drillers, and second, as an indicator of hydrocarbon-bearing zones. Today, gas-shows measurement is systematically acquired in the petroleum industry for the same reason, but it is seldom used to its full potential, mainly because of an ongoing prejudice that the data are not representative of the formation fluids and/or that the recording of these data is strongly influenced by varying drilling parameters. The ML gas system is composed of three parts:A "gas trap" to extract gas from the mud stream situated somewhere between the bell nipple and the shaker box (often in the latter).Lines, pumps, and filters enabling the transport of a dry-gas sample to the ML unit.A detection system in the ML unit. Recent efforts in the mud-logging industry to improve gas-data acquisition and analysis have led to the availability of better quality data, which has provided reliable lithological and fluid information since the 1990s. In the 1980s, most of the ML companies introduced the flame ionization detectors (FID) to replace previous total gas (TG) and chromatograph measurements. The TG measurement gives the total amount of hydrocarbon components extracted from the mud and burned in the detector. The TG could now be correlated with the C1-C5 readings from the new breed of chromatographs.5 Finally, over the past few years, several ML companies have introduced fast-gas chromatographs with improved resolution (C1-C5 in less than 1 minute), improved C1/C2 separation, and, above all, improved reliability and repeatability. High-speed chromatographs using a thermal-conductivity detector have also appeared on the market, but they were not tested within this project. Work carried out by Texaco in the early 1990s led to a significant improvement in basic trap design with the introduction of the quantitative gas measurement (QGM) trap, which was a major step in reducing the effect of environmental changes.6 An alternative proposition from Geoservices was to replace the trap, generally situated in the shaker box, with a pumping system supplying the trap with a constant volume of mud sucked from a probe situated close in the flowline to the bell nipple.7

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Jayarathne, Thilina, Chelsea E. Stockwell, Prakash V. Bhave, Puppala S. Praveen, Chathurika M. Rathnayake, Md Robiul Islam, Arnico K. Panday, et al. "Nepal Ambient Monitoring and Source Testing Experiment (NAMaSTE): emissions of particulate matter from wood- and dung-fueled cooking fires, garbage and crop residue burning, brick kilns, and other sources." Atmospheric Chemistry and Physics 18, no. 3 (February 15, 2018): 2259–86. http://dx.doi.org/10.5194/acp-18-2259-2018.

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Abstract. The Nepal Ambient Monitoring and Source Testing Experiment (NAMaSTE) characterized widespread and under-sampled combustion sources common to South Asia, including brick kilns, garbage burning, diesel and gasoline generators, diesel groundwater pumps, idling motorcycles, traditional and modern cooking stoves and fires, crop residue burning, and heating fire. Fuel-based emission factors (EFs; with units of pollutant mass emitted per kilogram of fuel combusted) were determined for fine particulate matter (PM2.5), organic carbon (OC), elemental carbon (EC), inorganic ions, trace metals, and organic species. For the forced-draft zigzag brick kiln, EFPM2.5 ranged from 12 to 19 g kg−1 with major contributions from OC (7 %), sulfate expected to be in the form of sulfuric acid (31.9 %), and other chemicals not measured (e.g., particle-bound water). For the clamp kiln, EFPM2.5 ranged from 8 to 13 g kg−1, with major contributions from OC (63.2 %), sulfate (23.4 %), and ammonium (16 %). Our brick kiln EFPM2.5 values may exceed those previously reported, partly because we sampled emissions at ambient temperature after emission from the stack or kiln allowing some particle-phase OC and sulfate to form from gaseous precursors. The combustion of mixed household garbage under dry conditions had an EFPM2.5 of 7.4 ± 1.2 g kg−1, whereas damp conditions generated the highest EFPM2.5 of all combustion sources in this study, reaching up to 125 ± 23 g kg−1. Garbage burning emissions contained triphenylbenzene and relatively high concentrations of heavy metals (Cu, Pb, Sb), making these useful markers of this source. A variety of cooking stoves and fires fueled with dung, hardwood, twigs, and/or other biofuels were studied. The use of dung for cooking and heating produced higher EFPM2.5 than other biofuel sources and consistently emitted more PM2.5 and OC than burning hardwood and/or twigs; this trend was consistent across traditional mud stoves, chimney stoves, and three-stone cooking fires. The comparisons of different cooking stoves and cooking fires revealed the highest PM emissions from three-stone cooking fires (7.6–73 g kg−1), followed by traditional mud stoves (5.3–19.7 g kg−1), mud stoves with a chimney for exhaust (3.0–6.8 g kg−1), rocket stoves (1.5–7.2 g kg−1), induced-draft stoves (1.2–5.7 g kg−1), and the bhuse chulo stove (3.2 g kg−1), while biogas had no detectable PM emissions. Idling motorcycle emissions were evaluated before and after routine servicing at a local shop, which decreased EFPM2.5 from 8.8 ± 1.3 to 0.71 ± 0.45 g kg−1 when averaged across five motorcycles. Organic species analysis indicated that this reduction in PM2.5 was largely due to a decrease in emission of motor oil, probably from the crankcase. The EF and chemical emissions profiles developed in this study may be used for source apportionment and to update regional emission inventories.

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Mikhaylov, Dmitry, Maksim Khatsayuk, and Konstantin Mikhaylov. "MHD Device for Transportation, Dosing and Heating Molten Metals." Applied Mechanics and Materials 698 (December 2014): 95–100. http://dx.doi.org/10.4028/www.scientific.net/amm.698.95.

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In the process of aluminum alloys production liquid melts are often required to load from one mould to another or to heat them to the definite temperature. For these purpose MHD-molds or MHD-pumps are commonly used. During the operation of such pumps the inside channels are often clogged with oxides. The paper presents the MHD-device consisting of MHD pressure pump with MHD stirrer used for transportation, dosage and heating aluminum alloys.

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ANKER, ARTHUR, CARLA HURT, and NANCY KNOWLTON. "Three transisthmian snapping shrimps (Crustacea: Decapoda: Alpheidae: Alpheus) associated with innkeeper worms (Echiura: Thalassematidae)in Panama." Zootaxa 1626, no. 1 (October 31, 2007): 1–23. http://dx.doi.org/10.11646/zootaxa.1626.1.1.

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The present study deals with three species of Alpheus, including two new species, living symbiotically in burrows of innkeeper worms (Echiura: Thalassematidae) on the tropical coasts of the western Atlantic and eastern Pacific Oceans. Alpheus christofferseni n. sp. is described on the basis of four specimens from Atol das Rocas, northwestern Brazil, and one specimen from Bocas del Toro, Caribbean coast of Panama. All specimens of this species were collected with suction pumps from burrows on intertidal or shallow subtidal sandflats; the Panamanian specimen was collected together with its echiuran host, Ochetostoma cf. edax (Fisher, 1946). Alpheus naos n. sp. is described on the basis of a single specimen found together with its host, Listriolobus sp., under large intertidal mud-covered rocks of Punta Culebra, Isla Naos, Pacific coast of Panama. Finally, two specimens of Alpheus aequus Kim & Abele, 1988 were collected together with their hosts, Ochetostoma edax, in the mixed rock-sand-mud intertidal of Coiba, Pacific coast of Panama. Remarkably, these three species are nearly identical in morphology and are also similar in color patterns. However, despite their morphological and ecological similarities, they are among the most genetically distinct of transisthmian alpheid geminate taxa examined to date. Genetic analyses suggest that A. aequus and A. naos n. sp. form an eastern Pacific clade whose sister taxon is the slightly more distantly related western Atlantic A. christofferseni n. sp. Estimated divergence times are ~10 mya for the two eastern Pacific species, and ~11–12 mya for the western Atlantic and eastern Pacific clades. Within Alpheus, A. christofferseni n. sp., A. aequus and A. naos n. sp. belong to the pantropical A. barbatus Coutière, 1897 species complex (A. barbatus clade), which also includes the eastern Atlantic A. ribeiroae Anker & Dworschak, 2004 and the Indo-West Pacific A. barbatus. The association of all three American species with thalassematid echiurans, as well as previous reports of associations between A. barbatus and echiurans in the western Pacific, suggest that this symbiosis is relatively ancient, having evolved in the ancestor of the A. barbatus clade (at least 12 mya and probably earlier).

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Gruver, J. K., R. D. Flack, and K. Brun. "Laser Velocimeter Measurements in the Pump of an Automotive Torque Converter: Part I—Average Measurements." Journal of Turbomachinery 118, no. 3 (July 1, 1996): 562–69. http://dx.doi.org/10.1115/1.2836703.

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A torque converter was tested for two turbine/pump rotational speed ratios, 0.065 and 0.800, and a laser velocimeter was used to measure three components of velocity within the pump. Shaft encoders were used to record the instantaneous pump angular position, which was correlated with the velocities. Average flow velocity profiles were obtained for the pump inlet, mid-, and exit planes. Large separation regions were seen in the mid- and exit planes of the pump for a speed ratio of 0.800. Strong counterclockwise secondary flows were observed in the midplane and strong clockwise secondary flows were seen in the exit plane of the pump for all conditions; vorticities were evaluated and are reported. Velocity data were also used to find the torque distribution. For both speed ratios the torque was approximately evenly distributed between the inlet and exit. Finally, slip factors were evaluated at the mid-and exit planes. At the midplane they were approximately the same as for conventional centrifugal pumps; however, at the exit plane the slip factors are larger than for centrifugal pumps.

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Christensen, Dawn M. "Physiology of Continuous-Flow Pumps." AACN Advanced Critical Care 23, no. 1 (January 1, 2012): 46–54. http://dx.doi.org/10.4037/nci.0b013e31824125fd.

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The use of mechanical pumps for circulatory support started in the mid-1950s. The evolution of these devices has led to the present-day use of continuous-flow pumps to take over the function of a patient’s failing heart. The physiology associated with rotary blood pump use is quite different from normal cardiovascular physiology. Clinicians caring for patients who are supported by rotary blood pumps must have an understanding of the differences in physiology, monitoring methods, and unique complications associated with the use of these pumps.

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Cardoso, Rafael M., Robson O. dos Santos, Rodrigo A. A. Munoz, Carlos D. Garcia, and Lucas Blanes. "A Multi-Pump Magnetohydrodynamics Lab-On-A-Chip Device for Automated Flow Control and Analyte Delivery." Sensors 20, no. 17 (August 31, 2020): 4909. http://dx.doi.org/10.3390/s20174909.

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This article shows the development of a computer-controlled lab-on-a-chip device with three magnetohydrodynamic (MHD) pumps and a pneumatic valve. The chip was made of a stack of layers of polymethylmethacrylate (PMMA), cut using a laser engraver and thermally bonded. The MHD pumps were built using permanent magnets (neodymium) and platinum electrodes, all of them controlled by an Arduino board and a set of relays. The implemented pumps were able to drive solutions in the open channels with a flow rate that increased proportionally with the channel width and applied voltage. To address the characteristic low pressures generated by this kind of pump, all channels were interconnected. Because the electrodes were immersed in the electrolyte, causing electrolysis and pH variations, the composition and ionic strength of the electrolyte solution were controlled. Additionally, side structures for releasing bubbles were integrated. With this multi-pump and valve solution, the device was used to demonstrate the possibility of performing an injection sequence in a system that resembles a traditional flow injection analysis system. Ultimately, the results demonstrate the possibility of performing injection sequences using an array of MHD pumps that can perform fluid handling in the 0–5 µL s−1 range.

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Chirkov, D. A., and E. O. Timashev. "Efficiency of a submersible plunger pump linear motor." E3S Web of Conferences 140 (2019): 02012. http://dx.doi.org/10.1051/e3sconf/201914002012.

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Modern oil extracting has difficulties with extraction at depths exceeding 2 kilometers from mid and low debit wells. Traditional way for extraction from mid and low debit wells (pumping unit) is unacceptable for this task, because of rod column break hazard. Meanwhile, submersible electrical centrifugal pumps that are usually used for oil extracting from big depth have very low efficiency on low debit wells. Due to that, a new class of oil extraction equipment has appeared—submersible plunger pumps. Their world-leading manufacturer is China. The biggest progress in submersible plunger pump linear drive research was reached in Perm National Research Polytechnic University. Although efficiency of this type of pumps on low debit wells is much higher than centrifugal pumps have, it is still very low and does not exceed 30%. Thus, efficiency improvement of gaining popularity submersible plunger pumps is an important task not only for oil extraction but also for energy saving. Major power loss happens in windings of submersible linear motors. Because of that, first step of pump efficiency improvement is improvement of linear drive efficiency. Motor design optimization allows to significantly raise its efficiency to 50%. Higher efficiency could be reached by optimizing motor operation algorithm and using better materials.

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Khan, Mohammed Asadullah, and Jürgen Kosel. "Integrated Magnetohydrodynamic Pump with Magnetic Composite Substrate and Laser-Induced Graphene Electrodes." Polymers 13, no. 7 (April 1, 2021): 1113. http://dx.doi.org/10.3390/polym13071113.

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An integrated polymer-based magnetohydrodynamic (MHD) pump that can actuate saline fluids in closed-channel devices is presented. MHD pumps are attractive for lab-on-chip applications, due to their ability to provide high propulsive force without any moving parts. Unlike other MHD devices, a high level of integration is demonstrated by incorporating both laser-induced graphene (LIG) electrodes as well as a NdFeB magnetic-flux source in the NdFeB-polydimethylsiloxane permanent magnetic composite substrate. The effects of transferring the LIG film from polyimide to the magnetic composite substrate were studied. Operation of the integrated magneto hydrodynamic pump without disruptive bubbles was achieved. In the studied case, the pump produces a flow rate of 28.1 µL/min. while consuming ~1 mW power.

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30

Fenton, R. N., and R. M. Wyche. "TWENTY-EIGHT DAYS IN THE BRISBANE VALLEY-DEALING WITH THE EXTERNAL ISSUES OF EXPLORATION WITHIN A RURAL RESIDENTIAL ENVIRONMENT." APPEA Journal 40, no. 1 (2000): 682. http://dx.doi.org/10.1071/aj99047.

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This paper examines challenges experienced when drilling Glamorgan–1, a wildcat exploration well located at Glamorganvale, 40 km west of Brisbane.The operation of the well received a high level of public and government scrutiny due to its proximity to local residences and the overseeing government departments in Brisbane. While exploratory hydrocarbon exploration drilling has occurred in close proximity to residences in other Australian states, this well was considered a first, as the well was drilled on a 24-hour basis within a rural residential population. To compound this issue, the immediate community consisted mainly of professionally employed people attempting to escape the urban noise and lifestyle. The well, drilled within the winter months of 1999, was located in a small valley surrounded by 11 houses within a 700 m radius.The paper considers the following key issues:Environmental management: Due to the well location and its proximity to the neighbouring residents, an environmental management plan was developed for the operation. A number of key issues were identified during the preparation of the EM plan, including noise, water use, waste water removal,social impacts, air quality, light and impact on fauna.Noise management: Noise levels recorded by four static loggers were correlated against rig activity to determine noise sources. The main sources of constant noise on the rig were the generators and mud pumps, with an increase in the level of intrusive noise occurring during tripping of the pipe. Not all noise could be controlled on the site and the focus of the mitigation was turned from controlling it at the source to mitigating its impact to the receiver using hay bales as soundbarriers.Community awareness of the drilling operation, and the overall acceptance of the project.

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FAITLI, József, and Imre GOMBKÖTŐ. "SOME TECHNICAL ASPECTS OF THE RHEOLOGICAL PROPERTIES OF HIGH CONCENTRATION FINE SUSPENSIONS TO AVOID ENVIRONMENTAL DISASTERS." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 23, no. 2 (June 25, 2015): 129–37. http://dx.doi.org/10.3846/16486897.2015.1021698.

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The behavior of slurries and suspensions made by mixing solid particles and liquids is very important for various industrial applications. The latest accidental failure events at tailings facilities (Kolontár, Baia Mare) have focused public interest into this field. Nowadays, environmental practice is turning to use dry deposition techniques or at least as high concentration slurries or pastes as possible, to avoid large spills in case of an accidental failure of an embankment. High concentration slurries are becoming widely accepted in many environmentally related operations such as underground backfilling or simple tailings deposition. However, the hydraulic transport of pastes or high density slurries requires higher energy input via pumps, and, in addition, the energy requirement or pressure loss calculation methods are also different because the rheology of pastes differs from that of dilute slurries. At the University of Miskolc, Institute of Raw Materials Preparation and Environmental Processing, Miskolc, Hungary, this topic has been studied for many decades. The fine suspension – coarse mixture flow model was introduced, and it has been determined that the flow behavior of fine suspensions made of solid particles smaller than a limit particle size can be measured and interpreted in almost the same way as for single phase clear liquids. Based on these measured rheological parameters of fine suspensions, the frictional energy loss can be calculated. The aim of this paper is to give a summary and data base about the rheological behavior of different industrial materials based on pilot scale hydraulic loop measurements. An Anton-Paar rotational viscometer and a tube viscometer with three measuring pipe sections,– developed by our institute – were used for testing. The results of measurements of various granular materials, such as sands, fly ashes, perlite, tailings and red mud are presented in connection with environmental applications. Based on these results, empirical relationships are presented, where the parameters are determined by simple function fitting into the data of measurements carried out at discrete concentration values. The rheology of fine suspensions of any concentration up to the measured maximum can be calculated by these relationships.

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32

Ainley, Steven B., Ronald D. Flack, Klaus Brun, and Tony J. Rovello. "Laser Velocimeter Measurements in the Pump of an Automotive Torque Converter Part I – Effect of Speed Ratio." International Journal of Rotating Machinery 6, no. 3 (2000): 167–80. http://dx.doi.org/10.1155/s1023621x00000166.

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A torque converter was tested at four turbine/pump rotational speed ratios (0.200, 0.400, 0.600, and 0.800) all with a constant pump rotational speed in order to determine the effect of speed ratio on the torque converter pump flow field. Laser velocimetry was used to measure three components of velocity within the pump and a shaft encoder was employed to record the instantaneous pump angular position. Shaft encoder information was correlated with measured velocities to develop flow field blade-to-blade profiles and vector plots. Measurements were obtained in both the pump mid- and exit planes for all four speed ratios. Results showed large separation regions and jet/wake flows throughout the pump. The midplane flow was found to have strong counter-clockwise secondary components and the exit plane flow had strong clockwise secondary components. Mass flows were calculated from the velocity data and were found to decrease as the speed ratio was increased. Also, the vorticity and slip factors were calculated from the experimental data and are included. The mid-plane slip factors compare favorably to those for conventional centrifugal pumps but less slip was present in the exit plane than the mid-plane. Neither the slip factor nor the vorticity were seen to be strongly affected by the speed ratio. Finally, the torque core-to-shell and blade-to-blade torque distributions are presented for both planes.

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33

Kulakov, P. A., I. H. Y. Apparov, and V. G. Afanasenko. "Improvement of mud pump valve." IOP Conference Series: Materials Science and Engineering 451 (December 14, 2018): 012201. http://dx.doi.org/10.1088/1757-899x/451/1/012201.

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Sun, Jun Yuan, and Ji Ming Xiao. "Dynamic Characteristics Analysis of the Mud Transfer Pump Rotor." Applied Mechanics and Materials 455 (November 2013): 248–52. http://dx.doi.org/10.4028/www.scientific.net/amm.455.248.

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The mud pump damming technology is a new idea put forward for realization of mechanization and automation of warping dam construction. A mud pump damming machine is studied, the FEM of the mud transfer pump rotor is built, modal analysis and rotor-dynamic analysis are carried out, natural frequencies and mode shapes under different constraints are obtained and the critical speeds of the pump rotor are determined, which will provide reference to improve the running reliability of the mud transfer pump rotor.

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35

Khatoon, Soofia, Tamanna Begum, and Nazma Begum. "Expression of Breast milk-an update." Journal of Shaheed Suhrawardy Medical College 4, no. 2 (April 3, 2013): 62–64. http://dx.doi.org/10.3329/jssmc.v4i2.14422.

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Breast feeding by sucking is the norm. However sometimes expression is the only way by which breast milk can be given to babies. There are many situations when expressing breast milk is useful and necessary to enable a mother to initiate or to continue breast feeding. Hand or breast pump are used to express breast milk. Hand expression is the most preferred method. There are some mechanical pumps though pumps cause discomfort and are usually ineffective. The Marmet technique of expressing breast milk with hand is a fabulous alternative to using a breast pump. Until recently hand expression of breast milk has been as underutilized skill. However, there are many benefits of knowing how to express milk from the breast without the use of expensive and cumbersome breast pumps. Expressed breast milk can be feed by spoon, cup and nasogastric tube. It is essential to collect and store breast milk properly to prevent the risk of bacterial overgrowth. Feeding with breast milk is quite safe if done properly. It is important for every woman to learn to express the milk. Certainly all health workers who take care for breastfeeding mothers should be able to teach the way of expression of breast milk. DOI: http://dx.doi.org/10.3329/jssmc.v4i2.14422 J Shaheed Suhrawardy Med Coll, 2012;4(2):62-64

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Denton, Richard A. "History of High Vacuum and Critical Point Equipment used in EM Specimen Preparation." Microscopy Today 1, no. 7 (November 1993): 3. http://dx.doi.org/10.1017/s1551929500068784.

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The electron microscope was only possible with the development of high vacuum technology. Mechanical pumps were available early in this century, and Gaede in Germany developed the mercury pump called a “condensation pump” during WWI and in the 1920's. In 1928, Burch in England found that a low vapor pressure oil would work in a mercury pump and the oil diffusion pump was born. They were made by DPI in Rochester, Metropolitan Vickers in England, and Leyboid in Germany. Other oils became available and in the mid-30's, vacuum evaporators were in laboratory use in England, Germany and the United States.In the 1930's and 40's, the aim was to produce vacuum of 10-4 - 10-5 mm Hg where the mean free path was two feet or more and atoms, molecules and electrons could move this distance with little obstruction. In those days, we were all very happy to get 10-4 - 10-5 without worrying much as to what gas was left.

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Su, Zi Mei, Yong Quan Sun, Hui Juan Yuan, and Jian Ying Guo. "Bayes Inference for Drilling Mud Pump Piston Life." Applied Mechanics and Materials 295-298 (February 2013): 3142–47. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.3142.

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Bayes confidence limit for domestic drilling mud pump piston life was given. Maximum likelihood estimation of mud pump piston life was discussed under Weibull life distribution. For further, failure mechanism of the same batch mud pump piston was studied, the shape parameter of Weibull distribution was considered to be constant. Bayes point estimation and confidence limit of distribution parameters and mud pump piston life were given, according to field life data collected from Daqing oil field, under non-information priori and conjugate prior information for scale parameter. Example shows the effectiveness of the proposed method.

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38

Janc, Blaž, and Željko Vukelić. "Mud-pump pressure in geothermal wells." Acta Geotechnica Slovenica 17, no. 1 (June 2020): 2–11. http://dx.doi.org/10.18690/actageotechslov.17.1.2-11.2020.

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39

Engeda, A., and Y. Elkacimi. "A regenerative flow compressor as a secondary air pump for engine emission control." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 9 (September 1, 2008): 1707–15. http://dx.doi.org/10.1243/09544062jmes958.

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A secondary air pump (SAP) is an air compressor that supplies air to the exhaust system of an automotive engine for the emission control of the engine. The SAP system has been offered as an emission control device in later versions of cars, starting in the mid-1990s. Various types of rotary and positive displacement air pumps have been tested and used for SAP application. The regenerative flow compressor/pump (RFC or RFP) and the centrifugal compressor have been found to be best suited for SAP application. This paper discusses the performance of an RFC for SAP application and shows the RFC to be the best choice for satisfying the required specifications of the SAP. Computational fluid dynamics analysis of the RFC for an SAP application was carried out to study its performance in detail.

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40

Xu, Yi Hong, and Chang Sheng Zhu. "Pneumatic High-Pressure Mud Pump Based on PLC Control." Applied Mechanics and Materials 716-717 (December 2014): 1595–98. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.1595.

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This paper proposes a design of pneumatic high-pressure mud pump based on PLC control. According to this method, we design the three-cylinder reciprocating single acting pneumatic high-pressure mud pump, and give the details of PLC control system and high-pressure pump body, finally briefly describe the working principle and the experimental results.

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41

Shen, Yue, Ling-Tan Zhang, Shi-Li Cui, Li-Min Sheng, Lin Li, and Yi-Nao Su. "Delay Pressure Detection Method to Eliminate Pump Pressure Interference on the Downhole Mud Pressure Signals." Mathematical Problems in Engineering 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/797549.

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The feasibility of applying delay pressure detection method to eliminate mud pump pressure interference on the downhole mud pressure signals is studied. Two pressure sensors mounted on the mud pipe in some distance apart are provided to detect the downhole mud continuous pressure wave signals on the surface according to the delayed time produced by mud pressure wave transmitting between the two sensors. A mathematical model of delay pressure detection is built by analysis of transmission path between mud pump pressure interference and downhole mud pressure signals. Considering pressure signal transmission characteristics of the mud pipe, a mathematical model of ideal low-pass filter for limited frequency band signal is introduced to study the pole frequency impact on the signal reconstruction and the constraints of pressure sensor distance are obtained by pole frequencies analysis. Theoretical calculation and numerical simulation show that the method can effectively eliminate mud pump pressure interference and the downhole mud continuous pressure wave signals can be reconstructed successfully with a significant improvement in signal-to-noise ratio (SNR) in the condition of satisfying the constraints of pressure sensor distance.

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42

Naidenov, N. B. "Reconditioning of worn mud pump cylinder sleeves." Chemical and Petroleum Engineering 27, no. 12 (December 1991): 734–35. http://dx.doi.org/10.1007/bf01155448.

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43

Gawlikowski, Maciej, Przemysław Kurtyka, Jerzy Zalewski, Magda Zarwańska-Doffek, and Artur Kapis. "Methodology for measuring the gap size using a fiber-optic displacement sensor exemplified by a centrifugal blood pump." Photonics Letters of Poland 12, no. 2 (July 1, 2020): 46. http://dx.doi.org/10.4302/plp.v12i2.1017.

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In order to avoid blood clotting, in the second generation of rotary blood pumps the impeller is suspended without mechanical bearing, using balance of magnetic and hydrodynamic forces. Reaching single tens of microns gap between pump housing and impeller is crucial for level of blood traumatization by the pump. In this paper we would like to present the method of physical measurement of this gap on a running pump with the use of commercial fiber-optic proximity sensor on the example of Polish rotary blood pump ReligaHeart ROT. We also discussed technical requirements of the construction of laboratory stand. Full Text: PDF ReferencesS. Westaby, "Rotary blood pumps as definitive treatment for severe heart failure", Future Cardiol. 9, 2 (2013). CrossRef R. Delgado, M. Bergheim, "HeartMate® II left ventricular assist device: a new device for advanced heart failure", Epert Rev. Med. Devices, 2, 5 (2005). CrossRef M. Ozban, T. Yagdi, C. Engin et al, Transplant proc., 44, 6 (2012). CrossRef A.T. Lanfear, M. Hamandi, J. Fan et al., "Trends in HeartMate 3: What we know so far", J. Card. Surg., 35, 1 (2020). CrossRef Ch. Zengsheng, S. Anqiang, W. Hongyu, "Non-physiological shear stress-induced blood damage in ventricular assist device", Medicine in Novel Technology and Devices, 3 (2019). CrossRef A. M. Robertson, A. Sequeira, R. G. Owens, Rheological models of blood In: L. Formaggia, A. Quarteroni, A Veneziani (eds) Cardiovascular Mathematics (Milano, Springer-Verlag 2009) CrossRef M. Gawlikowski et al., "Necessity of telemonitoring in patients treated by means of cardiac assist systems on the example of Polish rotary blood pump ReligaHeart ROT", Advances in Intelligent Systems and Computing, 925 (2019). CrossRef R. Kustosz, et al., "The tin coating utilisation as blood contact surface modification in implantable rotary left ventricle assist device religaheart ROT", Arch. Matall. Mater., 60, 3 (2015). CrossRef S. S. Patil, A. D. Shaligram, "Analytical study of performance variations of fiber optic micro-displacement sensor configurations using mathematical modeling and an experimental test jig", IJSER, 4, 11 (2013). DirectLink Philtec Application Note, 6, 25 (2017) CrossRef

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Cong, Qian, Tianyu Gao, Yiwen Sun, and Weijun Tian. "Sealing Performance of Bionic Striped Mud Pump Piston." Advances in Materials Science and Engineering 2019 (February 4, 2019): 1–9. http://dx.doi.org/10.1155/2019/8751540.

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The mud pump piston is a key part for providing mud circulation, but its sealing performance often fails under complex working conditions, which shorten its service life. Inspired by the ring segment structure of earthworms, the bionic striped structure on surfaces of the mud pump piston (BW-160) was designed and machined, and the sealing performances of the bionic striped piston and the standard piston were tested on a sealing performance testing bench. It was found the bionic striped structure efficiently enhanced the sealing performance of the mud pump piston, while the stripe depth and the angle between the stripes and lateral of the piston both significantly affected the sealing performance. The structure with a stripe depth of 2 mm and angle of 90° showed the best sealing performance, which was 90.79% higher than the standard piston. The sealing mechanism showed the striped structure increased the breadth and area of contact sealing between the piston and the cylinder liner. Meanwhile, the striped structure significantly intercepted the early leaked liquid and led to the refluxing rotation of the leaked liquid at the striped structure, reducing the leakage rate.

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SANG Youbao, 桑友宝, 王鹏远 WANG Pengyuan, 陈莹 CHEN Ying, 苏新军 SU Xinjun, 刘金波 LIU Jinbo, 郭敬为 GUO Jingwei, and 桑凤亭 SANG Fengting. "基于泵浦控制的波长可调谐Er： YAG中红外脉冲激光." ACTA PHOTONICA SINICA 50, no. 5 (2021): 68. http://dx.doi.org/10.3788/gzxb20215005.0514001.

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Sun, Jun Yuan, and Ji Ming Xiao. "Finite Element Analysis of a Mud Pump Damming Machine Frame." Applied Mechanics and Materials 541-542 (March 2014): 841–45. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.841.

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The mud pump damming technology is a new idea put forward for the realization of the warping dams constructed mechanization and automation. The mud pump damming machine is researched and developed. The FEA model of the machine frame is built. The deformation state, stress distribution, natural frequencies, mode shapes and also the biggest stress under loading the exciting force are obtained by processing the static analysis, modal analysis and harmonic analysis. The results show that the mud pump damming machine can basically meet the design requirements, while the vibrating screen driving motor should be improved to adjust its working frequency to avoid severe vibration, and the welding quality should be ensured to increase its service life.

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47

Li, Yi-bin, Chang-hong He, and Jian-zhong Li. "Study on Flow Characteristics in Volute of Centrifugal Pump Based on Dynamic Mode Decomposition." Mathematical Problems in Engineering 2019 (April 16, 2019): 1–15. http://dx.doi.org/10.1155/2019/2567659.

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To investigate the unsteady flow characteristics and their influence mechanism in the volute of centrifugal pump, the Reynolds time-averaged N-S equation, RNG k-ε turbulence model, and structured grid technique are used to numerically analyze the transient flow-field characteristics inside the centrifugal pump volute. Based on the quantified parameters of flow field in the volute of centrifugal pump, the velocity mode contours and oscillation characteristics of the mid-span section of the volute of centrifugal pump are obtained by dynamic mode decomposition (DMD) for the nominal and low flow-rate condition. The research shows that the first-order average flow mode extracted by DMD is the dominant flow structure in the flow field of the volute. The second-order and third-order modes are the most important oscillation modes causing unsteady flow in the volute, and the characteristic frequency of the two modes is consistent with the blade passing frequency and the 2x blade passing frequency obtained by the fast Fourier transform (FFT). By reconstructing the internal flow field of the volute with the blade passing frequency for the nominal flow-rate condition, the periodic variation of the unsteady flow structure in the volute under this frequency is visually reproduced, which provides some ideas for the study of the unsteady structure in the internal flow field of centrifugal pumps.

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Cheng, XJ, SF Ru, YW Sun, and Q. Cong. "Wear performance of bionic strip-shaped mud pump pistons." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 21 (July 13, 2016): 4076–84. http://dx.doi.org/10.1177/0954406216659679.

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The service life of mud pump pistons may be extended by imitating the body surface morphology of earthworms. To achieve this solution, bionic strip structures of various sizes are processed on the working surface of a BW-160 mud pump piston. The service lives of standard and bionic pistons are compared under experimental conditions. Results show that the bionic strip structure clearly improves the service life of mud pump pistons. The influence of the width of a bionic piston strip is greater than that of strip spacing. The bionic strip should not be too small or large because size could have negligible or deleterious effects on service life, respectively. The optimal structure parameters of a bionic strip piston when the optimal contact area between the piston and the cylinder liner is 73.5% are a strip width of 3 mm, strip spacing of 3 mm, and strip number of 3. These parameters improve piston service life by 81.5%. Finite element analysis simulations of wear demonstrate that the bionic strip can change the stress state on the working surface of the piston, increase lubricant storage space, improve the wear resistance of the piston, reduce extrusion injuries on the root, and prolong piston service life.

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Cao, Zheng, Jianqiang Deng, Linkun Zhao, and Lin Lu. "Numerical Research of Pump-as-Turbine Performance with Synergy Analysis." Processes 9, no. 6 (June 11, 2021): 1031. http://dx.doi.org/10.3390/pr9061031.

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The wide use of pumps and turbines has significant value in energy conservation and utilization. In this work, a three-dimensional Computational Fluid Dynamics (CFD) model and a one-dimensional theoretical model of a Pump as Turbine (PAT) were established. On this basis, the correlation between pressure and velocity was quantitatively investigated by a proposed sensitivity index (SPV). A synergy field analysis was then applied to evaluate the flow characteristics of a pump and PAT, providing a perspective from the mechanism of the energy transfer enhancement for hydraulic devices. Moreover, the hydraulic and synergy performances of PAT were studied under various operating conditions. The results show that the minimum SPV is obtained in the impeller. With increasing flow rate, the SPV of the PAT generally increases, and the synergy angle of the impeller surface increases as well. A strong disordered synergy field is observed in regions of the blade leading edge, trailing edge, and volute tongue. The variations in efficiency and head with flow rate showed similar trends, respectively, with the synergy angle of the outlet and the mid-plane. This study provides an analytical method for quantitative evaluation of flow synergy characteristics, and it supplies a basis for further design improvement of the pump and PAT.

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Shapiro, Lori E., and Neil H. Shear. "Drug interactions: Proteins, pumps, and P-450s." Journal of the American Academy of Dermatology 47, no. 4 (October 2002): 467–88. http://dx.doi.org/10.1067/mjd.2002.126823.

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Journal articles on the topic 'Mud pumps'

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