SPECIFICATION SHEET • SI METRIC
CAT: PIPE-PUMPING
NPSH Available Margin Check
Calculate Net Positive Suction Head Available (NPSHA) to prevent pump cavitation.
💡 Engineering Knowledge PrimerNet Positive Suction Head Available (NPSHA) is the absolute pressure available at the pump suction nozzle above liquid vapor pressure. NPSHA must exceed the pump manufacturer's NPSHR by at least 0.5 to 1.0 meters to prevent destructive cavitation.
OPERATING LIMITS — NPSHA calculation only. Compare it with the selected pump’s NPSHR and the manufacturer/application margin.
INPUT DESIGN PARAMETERS (SI)
m
m
m
m
CALCULATED SPECIFICATION OUTPUT
Net Positive Suction Head Available (NPSHA)
💧11.29 m
| Cavitation Margin Assessment | Compare NPSHA with the selected pump’s NPSHR plus the manufacturer/application margin. Status |
Related planning checklists
This calculator appears in the following engineering planning checklists:
Pump Cavitation & Energy Cost
Plant Operations Manager1. Pipe Pressure Loss Calculator2. Static & Total Dynamic Head (TDH)3. NPSH Available Margin Check4. Pump Operating Energy Cost Calculator
Technical Methodology & Engineering Principles
GOVERNING EQUATION
NPSHA = Ha + Hs - Hf_suction - Hvp
Assumptions & Scope
NPSHA must exceed pump required NPSHR by at least 0.5 - 1.0 m safety margin.
Operating Range & Boundary
Use finite, physically meaningful inputs within the stated operating assumptions.