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net positive suction pressure NPSP
Standard
ECSS-E-ST-35C Rev. 1Definition
difference between the total pressure and the vapour pressure at a given temperatureNotes
- NOTE 1 In accordance with this definition, NPSP = ptot - pvap(T).
- NOTE 2 There are 3 types of NPSPs (see Figure 3-2): - NPSPavailable which is the NPSP at a given instant and at a certain location. - NPSPcr, or critical NPSP which is the NPSP below which the pump pressure rise decreases below a pre defined value due to cavitation. - NPSPreq, or required NPSP which is NPSPreq = NPSPcr + safety margin. In accordance with these definitions, NPSPcr < NPSPavailable
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