Hydraulic calculators and field notes for sprinkler and standpipe work.
Run standpipe pressure checks, friction-loss estimates, and sprinkler flow calculations — then read short articles on the details that come up in design, install, and inspection.
Tools
Standpipe pressure, friction loss, end-head flow, measurement conversion, and soffit placement — each calculator targets one common job-site or plan-review question.
Standpipe Pressure Calculator
Check whether residual pressure at the pump is enough to deliver required pressure at the top of a standpipe riser.
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Friction Loss Calculator
Quick Hazen-Williams friction loss for a given flow, pipe length, diameter, and C-factor.
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End Head Pressure Calculator
Calculate sprinkler flow from density and area, then find pressure required for standard and custom K-factors.
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Feet & Inches Calculator
Add, subtract, and multiply feet-inch-fraction measurements, calculate area, and convert to decimal feet.
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Soffit Sprinkler Placement
Enter soffit width and height to find required placement per NFPA 13-2019 Chapter 10 (standard spray) and Chapter 12 (residential), for pendent and sidewall sprinklers.
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From the blog
Notes on standpipes, sprinkler hydraulics, and inspection details.
