Pump hydraulics calculations

Where a significant lift is required, such as at an offshore facility, several options are available such as a shaft driven, hydraulic drive, or electrical submersible pumps. Shaft driven vertical turbine pumps historically have been used extensively offshore. Reliability improvements for electrical submersible pumps with hydraulically driven units have been used more often as they eliminate alignment concerns, topside weight is limited, and in some instances, are less complex than the right angle engine driven vertical line shaft pumps. Hydraulic calculations for offshore pump installations must remember to account for wave and tide fluctuation. 

The required pump hydraulic horsepower (PHHP) can be calculated as... 

Start the mud pump, running as slowly as possible, to pump fluid at a rate of 1.5 to 2.0 bbl/min. This reduces fluid friction resistance pressures to a minimum and pumps at minimum standpipe pressure for circulation. The standpipe pressure (for 1.5 to 2.0 bbl/min) can be found from standard fluid hydraulic calculations. 

Confirm hydraulic calculations on all pump circuits and establish pump NPSH and minimum equipment elevations. 

The total power requirements for pumping are calculated by adding the hydraulic and the viscous power requirements. The former can be estimated from the MEB equation written for the work input, — W. We note that p — p2 and that Ef includes not only the friction losses on the discharge section but also the inlet section. The former was, as stated earlier, estimated to be 329.0 J kg , while the latter was estimated to be... 

Table 6-3 shows a pump hydraulic design calculation data sheet. Centrifugal Pump Efficiency... 

The computer program PROG62 sizes the centrifugal pump for the given flow rate and fluid characteristics. The program calculates the hydraulic brake horsepower required by the pump and the actual brake horsepower. In addition, the program computes the available net positive suction head (NPSH) and the pump efficiency. Table 6-7 shows the input data and results of the pump hydraulic design calculation. The available NPSH is 64 ft, and the actual brake horsepower required for the pump operation is 7.0hp, with a pump efficiency of 68%. 

Hydraulic Calculations. Fluid friction and turbulence within a heat exchanger cause the exit pressure of each fluid to be lower than its entrance pressure. It is desirable to minimize this pressure drop. If a fluid is made to flow by a pump, increased pressure drop will require more pumping power. As with convection resistance, pressure drop depends on many factors and is difficult to predict accurately. Empirical methods are again used. Generally, design changes that reduce the convection resistance will increase the pressure drop, so engineers must reach a compromise between these issues. 

Pump suction or discharge pressure can be calculated by performing a hydraulic calculation on the pump sucti< i and discharge line re ctively. After pump suction and discharge pressures are known, required pump head can be calculated as follows. 

Thermal-Hydraulic Analysis must be extended to at least 24 hours into the accident. This study used calculations for feed-and-bleed operation with a charging pump, and with gravity teed from the refueling water storage tank (RWST),... 

Underreamer Hydraulics. Pressure losses across the underreamer nozzles (orifice) are shown in Figures 4-178 and 4-179 [58]. The shaded area represents the recommended pressure drop required for cutters to fully open. These pressure drop graphs can be used for pressure losses calculations (given pump output and nozzles) or for orifice (nozzle) selection (given pump output and pressure loss required). 

Calculate the optimal hydraulic parameters for the hole depth of 8,555 ft if the available data are as given below Type of pump Continental Emsco F-1600 with 97% pump volumetric efficiency. To prevent rapid pump wear, the pump pressure should not exceed about 80% of the maximum pump pressure at any liner size. The hole size is 12- - in. and the mud weight is 9.7 Ib/gal. 

Brake horsepower, centrifugal pumps, 200 Driver horsepower, 201 Burst pressure, 405, 456 Cartridge filters, 274-278 Capture mechanism, 279 Edge filler, 278 Filter media, table, 278 Micron ratings, 277 Reusable elements, 281 Sintered metal, 280 Types, 276, 277, 279 Wound vs. pleated, 276, 277 Centrifugal pumps, operating characteristics, 177-180 Calculations, see hydraulic performance Capacity, 180... 

Overall coefficients, 332 Vertical plate coil, 331 Hindered settling velocities, 231, 236 Horsepower, centrifugal pump driver, 201 Hydraulic performance, calculations, 180-188... 

The second option considered was use of interception wells. One- or two-pump wells could be constructed at calculated spacings to create a hydraulic trough parallel to the canal to intercept the product. This design was considered more acceptable to the safety officer and the facility engineer, but was rejected by the maintenance foreperson because of the relative complexity of the operation system. The number of submersible pumps and sophisticated electronic controls would have required employment (or training) of technical specialists beyond the cost budgeted under normal operations. 

Related Calculations. Use the method given here for any type of pump whose variables are included in the Hydraulic Institute curves (Figs. 6.10 and 6.11) and in similar curves available from the same source. Operating specific speed, computed as above, is sometimes plotted on the performance curve of a centrifugal pump so that the characteristics of the unit can be better understood. Type specific speed is the operating specific speed giving maximum efficiency for a given pump and is a number used... 

Related Calculations. Use this procedure for any condensate or boiler-feed pump handling water at an elevated temperature. Consult the Standards of the Hydraulic Institute for capacity curves of... 

Related Calculations. Use the method given here for any uniform viscous liquid—oil, gasoline, kerosene, mercury, etc.—handled by a centrifugal pump. Be careful to use Fig. 6.32 only within its scale limits do not extrapolate. The method presented here is that developed by the Hydraulic Institute. For new developments in the method, be certain to consult the latest edition of the Hydraulic Institute—Standards. 

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