Essential Information for Accurate NPSHa Calculations
Accurate NPSHa (Net Positive Suction Head available) calculations are essential to every foam pump system design. At Fire Lion, we’re committed to helping engineers and system designers ensure reliable, efficient performance in the field. To support that process, we’ve compiled a detailed list of the information required to perform accurate NPSHa calculations. Having this data ready helps prevent delays, supports proper system evaluation, and ensures that your foam pump operates as designed—without cavitation or loss of performance.
Site Information
- Location and project name
- Elevation
- Maximum ambient temperature
- Minimum ambient temperature
System Information
- Foam pump model (and serial number if installed)
- Foam pump duty point:
- Required discharge pressure
- Required flow rate
- RPM
- P&ID of the complete foam system
- Isometric drawing of suction piping from the foam tank (including any piping inside the tank) to the pump inlet
- Note elevation changes in piping and minimum foam level in the tank
- Pipe inside diameters
- Pipe wall thickness (SCH 10, 40, etc.)
- Pipe material type
- Label all fittings and valves
- Piping centerline-to-centerline dimensions
- Connection type of each fitting and valve (NPT, flange, groove, socket weld, butt weld, etc.)
- Suction gauge location and height measured to the center of the gauge
- Provide data sheets on all valves, strainers (including mesh size), and bulkhead fittings
Foam Concentrate Information
- Brand and type of foam
- Vapor pressure
- Density
- Pressure loss per ft data and chart with equivalent length of fittings
- Viscosity
- Shear table (for non-Newtonian foams)
Final Thoughts
Accurate NPSHa data is the foundation of reliable foam system performance. If you have questions about the information listed here or need assistance evaluating your system, Fire Lion’s engineering team is here to help. Contact us at info@firelionglobal.com or 360-574-9068 for guidance or to review your NPSHa data before installation or commissioning.
