A complete hydraulic calculation for a tree sprinkler system, not just one pipe: start at the most remote sprinkler, walk the branch line node by node, carry the branch to the cross main with its K-equivalent, add the feed main, the riser, valves and elevation, then check the demand plus hose allowance against your water supply curve. The default values reproduce the worked example of our NFPA course.
How to use it
- Enter the design density, the area each sprinkler protects and the K-factor; the tool applies the minimum operating pressure at the end head.
- Set how many heads each branch line has, how many branch lines are in the remote area, and the spacings.
- List the branch pipe sizes from the remote end (for example 25,32 means the first segment DN25, then DN32).
- Fill in the branch inlet, cross main, feed main and riser rows with length, fitting equivalent length and rise.
- Enter the flow-test data of your water supply (static, residual and flow) and read the margin at the demand point.
Step-by-step guides
- Sprinkler Hydraulic Calculation: A Step-by-Step Worked Example
- Sprinkler Hazard Classification: LH, OH1, OH2, EH1 and EH2 Explained
- Fire Pump Sizing to NFPA 20: Rated Point, Curve Checks and Jockey
- Sprinkler Spacing Rules: Areas, Wall Distances and Obstructions
More free tools
- Sprinkler Flow & Pressure Calculator (q = K√p)
- Hazen–Williams Pipe Friction Loss Calculator
- MEP Unit Converter — kW, BTU/h, TR, CFM, L/s, bar, psi
- All free MEP calculators
- MEP Library
Results are for preliminary design and checking. Always confirm against the standard edition and local regulations that apply to your project.
Online course · certificate included
Fire Protection & Suppression Systems Design (NFPA)
20 narrated modules with animated diagrams, two complete worked projects (DWG + DXF), the Fire Calc Workbook and an online calculator.
Modules 1–3 are free, no account needed · full course €15,00 one-time