Cavitation in centrifugal water pumps is primarily controlled by keeping available NPSH (NPSHA) in relation to the pump’s required NPSH (NPSHR) in which way at the design point?

Choices

• (A) NPSHA sufficiently above (greater than) NPSHR with margin, per pump curve and code margin
• (B) NPSHA = 0.5 NPSHR
• (C) Ignore vapor pressure in warm water
• (D) NPSH only for fans