Pump Sizing Calculator

The calculator determines the total differential head and power required to pump a liquid from a source vessel through a line to a destination vessel.

Frictional and static pressure losses are determined for the suction side and discharge side of the pump. NPSH available, including a user specified margin if required, is also calculated.

1. Enter the pump and vessel tag numbers
2. Enter the barometric pressure at the pump
3. Enter the margin over the basic NPSH available, if required
4. Enter the pump efficiency
5. Enter the fluid details and physical properties
6. Enter the suction and discharge vessel gas pressures
   • Set the suction vessel pressure to 0 barg if the pump is pumping from atmospheric pressure
   • Set the discharge vessel pressure to 0 barg if the pump is pumping to atmospheric pressure
7. Enter the suction and discharge static heads
8. Choose the nominal diameter and schedule of the suction and discharge lines
9. The calculator will determine the inside diameter of each line
10. Enter a length for the suction and discharge lines
11. Enter an absolute roughness for each pipe. Typical values:
12. • Commercial steel: 0.046 mm
    • Drawn tubing (brass, lead, glass): 0.002 mm
    • Asphalted cast iron: 0.122 mm
    • Galvanized iron: 0.152 mm
    • Cast iron: 0.259 mm
13. Enter the quantities of each type of fitting for each pipe if known
14. If the type and quantities of each fitting are unknown, enter a fitting factor. Typical factors for 50 metre long lines:
    • 3" diameter and smaller: 1.5
    • 4" and 6" diameter: 2.0
    • 8" diameter and larger: 2.5
15. Enter a discharge control valve differential pressure if a control valve is fitted in the discharge line
16. Click the "Calculate" button
17. The calculator will determine the total differential pressure and power required to pump the specified fluid
18. The NPSH available will also be calculated