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NPSH
NPSH
NPSHa = (P0-Pv)/(ρ·g) ± Δh - Hf
Available NPSHa
Density
kg/m³
Surface pressure P0
Pa (abs)
Vapor pressure Pv
Pa (abs)
Lift height Δh
signed
Suction friction Hf
m
Required NPSHr
m
Safety margin
m
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Pressure head
—
m
NPSHa
—
m
Final NPSHa
—
m
Status
Estimate NPSHr
Flow
m³/h
Speed n
r/min
Suction C
900-1300
Calculate
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Est. required NPSH
—
m
NPSHr speed conversion
Rated speed n1
r/min
Actual speed n2
r/min
NPSHr at n1
m
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Converted NPSHr
—
m
Engineering estimate.