Calculation of pump head in production

Hsg=(Pb+△P-Pcy)×102＋△Pgs+△Pjs+Hy-Hj, where Pb is the operating pressure of the boiler drum. MPa (gauge pressure) △P------The excess pressure required to open the safety valve, in MPa ； Generally, △P = (0.03～0.05)Pb. Pcy -------- is the operating pressure of the deaerator, in MPa (gauge pressure). △Pgs----- represents the resistance in the feedwater pipeline, including the resistance of all heaters, valves, and accessories from the outlet of the feedwater pump to the boiler inlet (expressed in head), in meters ； (Flow rate: 2–3 m/s) △Pjs-----The resistance in the water supply pipeline, including the resistance of all pipes, valves, and accessories from the outlet of the water storage tank to the inlet of the water pump (expressed in head), in meters ； (Flow rate: 0.5–1 m/s) Hy--------The geometric height difference from the center of the water pump to the normal water level in the drum, in meters. Hj--------The geometric height difference from the lowest water level in the deaerator to the center of the water pump (static head at the inlet of the feed water pump), in meters