Seal chamber pressure value Pm for different types of pumps (for reference)

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Pressure value Pm in the sealing chamber of different types of pumps (for reference): Pump type, estimation formula. Pump with a rear cover equipped with back blades and wear-resistant rings: Pm = Ps + 0.25(Pd – Ps). Here, Ps is the pump inlet pressure, and Pd is the pump outlet pressure; the same applies hereafter. Rear cover with balance hole: Pm=Ps+0.10(Pd-Ps). With back blades and balance hole: Pm=Ps. Rear cover equipped with an anti-wear ring, no balance hole: Pm=Ps+1.8 bar. Open impeller, without rear cover or balance hole: Pm=Ps+C(Pd-Ps). Note: C=0.1 (for maximum impeller diameter), C=0.3 (for minimum impeller diameter). Rear cover without anti-wear ring, no balance hole: Pm=Ps (this is the case for most vertical pumps). Double-suction pump: Pm=Ps. Multi-stage pump: Analysis is based on the arrangement of balance pipes, balance discs, and balance drums; the pressure in the sealing chamber is sometimes equal to the inlet pressure, sometimes it is the outlet pressure of an intermediate stage, and sometimes it is the outlet pressure of the pump.