NFPA 25 work procedure

Water Supply Analysis Workflow

Use hydrant test readings to estimate available flow, compare demand, and document preliminary water supply margins.

Guide workflow

Follow the sequence as an engineering workflow: each phase lists the action, tools, and evidence to retain before moving forward.

Phase	Action	Tools	Evidence to keep
Step 1	Record static and residual pressures.	Hydrant Flow Test Calculator	Document the source used to start the NFPA 25 workflow.
Step 2	Calculate flow from pitot pressure and outlet diameter.	Hydrant Flow Test Calculator, Available Water Supply Calculator	Keep calculation notes showing how this step supports: calculate flow from pitot pressure and outlet diameter.
Step 3	Estimate available flow at the required residual pressure.	Hydrant Flow Test Calculator, Available Water Supply Calculator	Keep calculation notes showing how this step supports: estimate available flow at the required residual pressure.
Step 4	Compare available flow to system demand.	Hydrant Flow Test Calculator, Available Water Supply Calculator	Keep calculation notes showing how this step supports: compare available flow to system demand.
Step 5	Flag low-margin conditions for engineering review.	Hydrant Flow Test Calculator, Available Water Supply Calculator	Record the reviewed output, warning state, and next review decision.

1NFPA 25 workflow basis and project condition that triggered this guide.
2Input source notes for each calculator used in the sequence.
3Intermediate results, warnings, and pass/fail states from linked tools.
4Final review notes for engineering review, submittal review, field check, or AHJ coordination.

1The sequence starts with project-specific inputs, not untouched default values.
2Each intermediate result is checked before being transferred into the next calculator.
3Warnings or failed screens are resolved or documented before final project use.
4NFPA 25 context and local AHJ requirements remain part of the final review.

1Use this guide as a workflow checklist, not as a sealed design package.
2Start with the related worksheet before treating the guide as complete.
3Open the linked calculators when a step needs a numeric screen.
4Transfer only reviewed values and documented assumptions into project calculations or submittal material.

Water Supply Analysis Workflow

1Start from the standard workflow context when the guide controls a design or field-review decision.
2Open the related worksheet before treating the guide as complete.
3Run the related calculator sequence when a step needs numeric screening.
4Retain reviewed inputs, warnings, and handoff notes before final project use.