Pump model

Increasing the shaft diameter is the most logical solution. This can be done with some pump models by simply replacing sleeved shafts with solid shafts, or by increasing the diameter of the solid shaft with a small modification to the seal chamber bore. With the pump disassembled on the shop table, the mechanic can identify the source of the problem in the pump. 

The report includes pedigree information on each plant. This includes plant name and unit number, type, vendor, number of pumps, pump designer, pump model number, and number of seal stages. 

Brkich, A., Vertical Pump Model Tests and Intake Design, presented Boston Section A.S.M.E., Feb. 1933. 

Triplex Mud Pump, Model 10-P-13 National Supply Company, Example 2... 

Pro-Minment Dosing Pumps - Models ElOOO/T and ElOOO/S Prominent Fluid Controls (UK) Ltd, Queen s Drive,... 

Variable Speed Peristaltic pumps - Models lOlU and 501U/R Watson - Marlow Ltd, Falmouth... 

Model RR/066 351 and 352 pumps models 750/16 variable-wavelength UV monitor detector 750/11 variable filter UV detector, MPD 880S multiwave plasma detector, 750/14 mass detector 750/350/06 electrochemical detector refractive index detector HPLC columns column heaters, autosamplers, pre-columns derivatization systems, solvent degassers, preparative HPLC systems... 

Laskey, R. A. and Madine, M. A. A rotary pumping model for helicase function of MCM proteins at a distance from replication forks. EMBO Rep 2003, 4, 26-30. 

Apparatus. The major components in the HPLC system (Figure 2) include a Varian HPLC pump (model 5000, Varian Assoc., Walnut Creek, CA), Altex injection valve (model 210, Beckman Inst., Fullerton,... 

A gSe of two Waters ultrastyragel columns, designated 10 A and 10 A and a Waters pump (Model 590) for HPLC were used in this study. The elution solvent was tetrahydrofuran (THE) which was distilled in the presence of a small amount of CaH in order to remove the peroxide. The flow rate was maintained at 1 ml/min. The sample injection volume was -30 pi. The chromatogram detected by the differential refractometer (Waters R401) was recorded on a strip chart recorder. All experiments were performed at room temperatures with concentrations below the over-loading condition. 

Figure 11. Flow rate vs. time, pump model P-125...

Figure 13. Temperature effect, pump model P-2500 (O) Pump /, Pump...

Mechanical Pumps. Most modern fore pumps are mechanical ones with a revolving rotor and oil seal. All pump models follow the same principle, although they differ in design. 

Pump. Solution is pumped at low flow rate through the cell by means of a Lapp Pulsafeeder pump Model LS-10. Difficulty in maintaining constant flow at slow flow rates was traced to small air pockets in the diaphragm pump head that would not spontaneously pass the exit check valve. This difficulty was remedied by the aspiration of the feed solution to remove dissolved gases. To minimize the hazard of implosion of the feed reservoir, a cage was made from 1/4-inch hardware cloth to fit the 20-liter reservoir. 

HPLC separations were carried out with a reverse-phase column (pBondapak C-18) using methanol-water (45 55) at 1.8 mL/min for 13.5 min followed by methanol-water (60 40) for 20 min. A Waters 6000A pump, Model 440 UV absorption detector and a fraction collector (LKB Multirac) were used. Fractions eluting from the column were collected and assayed by LSC. Retention times of fenitrothion, AF, and MNP under these conditions were 27.0, 11.0, and 7.5 minutes, respectively. 

The Isothermal Newtonian Standard Mathematical Pumping Model... 

Figure 2. Flow Sheet of the HPLC Unit for Rapid Protein Analysis. A binary gradient system with gradient controller, Model 21500 pumps,Model 2152 controller, Pharmacia, Piscataway, NJ, U.S.A. (A), Variable wavelength UV-Visible detector, Model LC 95, Perkin Elmer, Norwalk, CT, U.S.A (B), Constant temperature circulating bath, Model DL-8 Haake Buchler, Saddlebrook, NJ, USA (C), Heat exchangers (D), Sampling valve,...

Honeyman, B.D., and Santschi, P.H. (1989) A Brownian-pumping model for oceanic trace metal scavenging evidence from Th isotopes. J. Mar. Res. 47, 951-992. 

Keywords hydride, hydrogen, hydride bed, heat pump, modeling, experiment. 

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