NFPA 25 calculation brief
Pitot Pressure to GPM Conversion
Pitot Pressure to GPM Conversion explains the calculation inputs, formula context, field checks, and limits engineers should confirm before using results in a project workflow.
Page role
Use this page for a defined task before moving to the next project record.
- Audience
- Engineers, designers, technicians, contractors, and reviewers using a calculator-linked technical brief.
- Job
- Pitot Pressure to GPM Conversion supports hydrant flow and water supply comparison workflow by turning verified inputs into a calculator result, reference check, and worksheet handoff instead of a standalone explanation.
- Evidence
- Static pressure, Residual pressure, Pitot pressure or test flow, Outlet diameter, Required residual pressure
- Output
- Confirm static, residual, pitot, and flow values belong to the same test event. Calculate available flow at the same residual pressure used for demand comparison.
- Next
- Use /worksheets/hydrant-flow-water-supply before treating this topic as complete.
Calculator-first route
- 1Confirm the worksheet context before using this brief as a calculation input.
- 2Verify required inputs and linked reference data before opening the calculator.
- 3Run the related calculator, review warnings, and compare the output against the review checks.
- 4Carry only reviewed values into the worksheet, authority record, or final project package.
Technical brief workflow
Use this page as a calculator-linked technical brief: confirm the role, verify inputs, run checks, and move to the next tool.
| Brief phase | Engineering detail | Evidence or next step |
|---|---|---|
| Calculator role | Pitot Pressure to GPM Conversion supports hydrant flow and water supply comparison workflow by turning verified inputs into a calculator result, reference check, and worksheet handoff instead of a standalone explanation. | Hydrant Flow Test Calculator, Available Water Supply Calculator, Water Supply Curve Plotter |
| Inputs to verify | Static pressure, Residual pressure, Pitot pressure or test flow, Outlet diameter, Required residual pressure | Sprinkler Pipe Internal Diameter Reference, US Code Adoption and AHJ Checkpoints |
| Review checks | Confirm static, residual, pitot, and flow values belong to the same test event. | NFPA 25 |
| Next step | Start from hydrant flow and water supply comparison workflow when this topic controls a design or field-review decision. | Use /worksheets/hydrant-flow-water-supply before treating this topic as complete. Open /calculator/water-supply/hydrant-flow-test when the topic needs numeric screening. Check /reference/pipe-dimensions before transferring reviewed values into the project package. |
Input checklist
- 1Static pressure
- 2Residual pressure
- 3Pitot pressure or test flow
- 4Outlet diameter
- 5Required residual pressure
Next steps
- 1Start from hydrant flow and water supply comparison workflow when this topic controls a design or field-review decision.
- 2Use /worksheets/hydrant-flow-water-supply before treating this topic as complete.
- 3Open /calculator/water-supply/hydrant-flow-test when the topic needs numeric screening.
- 4Check /reference/pipe-dimensions before transferring reviewed values into the project package.
Technical review checks
- 1Confirm static, residual, pitot, and flow values belong to the same test event.
- 2Calculate available flow at the same residual pressure used for demand comparison.
- 3Flag stale, incomplete, or mixed hydrant test data before project reliance.
- 4Carry supply results into sprinkler demand or pump worksheets with pressure basis.
Where this fits in the workflow
Use this brief inside the hydrant flow and water supply comparison workflow. It should answer a calculation handoff question, not act as general reading. Start from the related worksheet and open the linked calculator only after the input source is known.
Inputs to verify
Before running a tool, verify: Static pressure, Residual pressure, Pitot pressure or test flow, Outlet diameter, Required residual pressure. Check units, equipment listings, pipe or conductor data, and whether the value comes from measured field data or an early design assumption.
Calculator sequence
Use the related calculator set for this topic: /calculator/water-supply/hydrant-flow-test, /calculator/water-supply/available-flow, /calculator/water-supply/supply-curve. Review warning states and compare the output with the linked reference basis before transferring it into a worksheet.
Project record handoff
Retain the calculator inputs, result, formula context, warning state, reference row, and worksheet handoff note together. The next project record is /worksheets/hydrant-flow-water-supply.
Limits before project use
Confirm static, residual, pitot, and flow values belong to the same test event. Treat the output as a screening value. If the result controls design, has a narrow margin, affects equipment selection, or affects AHJ approval, it should be reviewed in the full design package by a qualified professional.
Worksheet handoff
Calculation tools
Next records
Pitot Pressure to GPM Conversion
Open related tools
Before filing
- 1Start from hydrant flow and water supply comparison workflow when this topic controls a design or field-review decision.
- 2Use /worksheets/hydrant-flow-water-supply before treating this topic as complete.
- 3Open /calculator/water-supply/hydrant-flow-test when the topic needs numeric screening.
- 4Check /reference/pipe-dimensions before transferring reviewed values into the project package.