Altitude above sea level:

ft

meters

Atmospheric pressure at given altitude:

ft w.g.

kPa

Leaving Water Temperature (LWT):

°F

°C

Water vapor pressure at LWT°:

ft w.g.

kPa

Friction losses in suction pipe:

ft w.g.

mm w.g.

Height "H" (see image):

ft

mm

NPSHa (available at pump's suction)

inches

mm w.g.

- Fill out the
**green spaces**only. - "Height" is the elevation difference between the pump inlet and the water surface in the tower
- Although "H" is not equal to the foundation height, we suggest to use it as such, in order to have some safety factor built into the calculation
- Calculated NPSHa must be higher than the pump's NPSHa at duty point
- If the calculated NPSHa is insufficient, increase the height until the NPSHr is satisfied (NPSHa > NPSHr)
- Do not input negative values for "H" (flooded suction)