PPEC Pressure Powered Pump Selection and Sizing（PPEC压力驱动泵的选择和分级）.pdf

PPEC Pressure Powered Pump Selection and Sizing How to Select Size Condensate load 3000 lb/h From the inlet pressure, back pressure and filling head conditions given below, select Steam pressure available for operating pump 75 psig the pump size and check valve package which meets the capacity requirement of the Vertical lift from pump to the return piping 30 feet application. Pressure in the return piping (piping friction negligible) 25 psig Specify pump body type. Select optional extras as required. Filling head on the pump available 6 inches For GPM, multiply the capacities below by 0.002. Solution: For kg/h, multiply the capacities below by 0.454. 1. Calculate H, the total lift or back pressure, against which the condensate must be For liquid specific gravities from 0.9 to 0.65, consult Spirax Sarco. pumped. = (30 x 0.433) + 25 = 38 psig * Back pressure is the lift height (H) in feet x 0.433 plus psig in return line, plus 2. From capacity table, with 75 psig inlet pressure and 40 psig back pressure, choose a downstream piping friction pressure drop in psig. calculated based on the maximum 1-1/2 pump with stainless steel check valves, which has a capacity of 3300 lb/h. instantaneous discharge rate of the respective pump selected. (See TIS Sheets) Note from capacity multiplying factor charts: Not