Fire Pump Discharge Pressure Calculator
Find the exact pressure your fire pump needs with a reliable fire pump discharge pressure calculator. This guide helps you calculate accurate discharge pressure for fire protection systems. Use simple steps and real examples to ensure safety and compliance.
Fire Pump Pressure Calculator
How to Use Fire Pump Discharge Pressure Calculator
Follow these simple steps to use a fire pump discharge pressure calculator:
- Step 1: Enter Static Pressure: Input the suction or incoming water pressure (in psi or bar).
- Step 2: Add Elevation Head: Enter the vertical height from pump to the highest discharge point. Use: 1 foot = 0.433 psi or 1 meter = 0.1 bar.
- Step 3: Include Friction Loss: Add pipe friction loss based on pipe length, diameter, and fittings.
- Step 4: Enter Required Residual Pressure: Input the pressure needed at the outlet (e.g., hydrant or sprinkler).
- Step 5: Calculate: Click calculate to get the fire pump discharge pressure.
How to Calculate Fire Pump Discharge Pressure
Use this formula:
Step-by-Step Example
Given:
Static Pressure = 20 psi
Elevation Height = 30 ft
Friction Loss = 10 psi
Required Residual Pressure = 50 psi
Step 1: Convert Elevation to Pressure
Elevation Pressure = 30 × 0.433 = 12.99 psi
Step 2: Apply Formula
Discharge Pressure = 20 + 12.99 + 10 + 50
Step 3: Final Result
Discharge Pressure = 92.99 psi (≈ 93 psi)
This value ensures proper water delivery in fire protection systems.
Fire Pump Discharge Pressure Conversion Chart
| Elevation (ft) | Pressure (psi) | Elevation (m) | Pressure (bar) |
|---|---|---|---|
| 10 ft | 4.33 psi | 3 m | 0.30 bar |
| 20 ft | 8.66 psi | 6 m | 0.60 bar |
| 30 ft | 12.99 psi | 9 m | 0.90 bar |
| 50 ft | 21.65 psi | 15 m | 1.50 bar |
| 100 ft | 43.30 psi | 30 m | 3.00 bar |
FAQs About Fire Pump Discharge Pressure Calculator
A fire pump discharge pressure calculator helps determine the total pressure required at the pump outlet to meet system demands.
Proper discharge pressure ensures water reaches all outlets with enough force during emergencies.
Key factors include: Static pressure, Elevation height, Pipe friction loss, and Required outlet pressure.
Multiply height (ft) by 0.433 to convert it into psi, or height (m) by 0.1 to convert it into bar.
It depends on system design, but most systems require 50–150 psi at discharge.
Yes, you can use the fire pump discharge pressure calculator for both hydrant and sprinkler systems.
It is highly accurate when you input correct system data and friction loss values.
Yes, pipe size affects friction loss, which directly impacts discharge pressure.
You can use psi or bar, but ensure consistency throughout the calculation.
Yes, ignoring friction loss leads to underestimating the required discharge pressure.