Is there someone that could help to understand how the Net Positive Suction Head (NPSH) equation below applies to the LN2?
NPSHa = p + Lh – (Vp – Hf)
Where:
p – Pressure on surface of liquid in closed suction tank, in feet absolute
Lh – Minimum static suction head in feet
Vp – Vapor pressure of...
Thanks dcasto
It is 72,000 scfm. Each pump capacity is 270 gpm.
I did not mention that this system will be working only once a day during 20 min test. Is there any concern about the pump start-up? Also, should the pump discharge pipe be insulated? The suction line will be VJ pipe.
We need to provide variable flow (3,000 – 72000 scfm) of GN2 at 250 psi and 70 degrees F to several modulators in a test room. We need to maintain 220 psig pressure in the test room manifold. Three centrifugal pumps with VFD’s will pump LN2 through (2) water bath vaporizers. The LN2 is stored...
