NFPA 25

Water Supply Tools

Hydrant and water supply tools for converting pitot readings, plotting supply curve points, and estimating available flow at required residual pressure.

4 tools1 tablesNFPA 25

Workflow tools

Interactive calculators

Standard context

NFPA 25

Primary engineering basis

Reference tables

Input setup support

Water Supply Tools workflow

Use this category page as a workflow control surface: confirm entry conditions, run the tools, review quality gates, and keep the records.

Phase	Workflow step	Inputs	Outputs	Quality gate
Phase 1 NFPA 25	Enter hydrant test data, pitot pressure, outlet diameter, static pressure, and residual pressure.	Static pressure, Residual pressure, Test flow	Hydrant flow, Available flow, Supply curve point	Inputs have been checked against drawings, device listings, field test records, or project criteria.
Phase 2 NFPA 25	Calculate flow or available water supply using the visible test relationship.	Residual pressure, Test flow, Pitot pressure	Available flow, Supply curve point, Residual pressure check	Outputs including Hydrant flow, Available flow, Supply curve point, Residual pressure check have been reviewed before project use.
Phase 3 NFPA 25	Compare supply outputs against sprinkler demand and pump sizing screens.	Test flow, Pitot pressure, Outlet diameter	Supply curve point, Residual pressure check	Warnings, failed screens, or narrow margins are documented before moving to the next workflow.

Phase

Workflow step

Inputs

Outputs

Quality gate

Phase 1

NFPA 25

Enter hydrant test data, pitot pressure, outlet diameter, static pressure, and residual pressure.

Static pressure, Residual pressure, Test flow

Hydrant flow, Available flow, Supply curve point

Inputs have been checked against drawings, device listings, field test records, or project criteria.

Phase 2

NFPA 25

Calculate flow or available water supply using the visible test relationship.

Residual pressure, Test flow, Pitot pressure

Available flow, Supply curve point, Residual pressure check

Outputs including Hydrant flow, Available flow, Supply curve point, Residual pressure check have been reviewed before project use.

Phase 3

NFPA 25

Compare supply outputs against sprinkler demand and pump sizing screens.

Test flow, Pitot pressure, Outlet diameter

Supply curve point, Residual pressure check

Warnings, failed screens, or narrow margins are documented before moving to the next workflow.

Entry conditions

1Use this workflow when the task belongs to water supply tools and the controlling project condition is known.
2Collect Static pressure, Residual pressure, Test flow, Pitot pressure before opening individual calculators.
3Confirm the values are project-specific, field-measured, manufacturer-listed, or selected from linked reference tables.

Records to keep

1Water Supply Tools input source checklist.
2Reviewed output set: Hydrant flow, Available flow, Supply curve point, Residual pressure check.
3Linked reference values used for the calculation basis.
4Next-step review note for final calculation package, field review, or submittal check.

Next steps

NFPA 25 Flow Test and Water Supply Calculators Sprinkler Pipe Internal Diameter Reference Hydrant Flow and Water Supply Calculators

Reference tables for this workflow

Sprinkler Pipe Internal Diameter Reference

Use

Use each calculator for screening and field checks before final project calculations.

Tools in this workflow

Tool	Workflow role	Input basis	Primary outputs	Open
Hydrant Flow Test NFPA 25	Convert hydrant or flow test observations into water supply screening values.	Discharge coefficient, Outlet diameter, Pitot pressure	Hydrant flow	Open
Pitot Flow NFPA 25	Convert hydrant or flow test observations into water supply screening values.	Discharge coefficient, Outlet diameter, Pitot pressure	Hydrant flow	Open
Available Water Supply NFPA 25	Convert hydrant or flow test observations into water supply screening values.	Measured test flow, Static pressure, Residual pressure	Available flow	Open
Water Supply Curve Plotter NFPA 25	Convert hydrant or flow test observations into water supply screening values.	Measured test flow, Static pressure, Residual pressure	Available flow, Static pressure, Residual pressure	Open