FireCalc – Hydrant Testing (Hose Monster)

Hydrant Testing – Hose Monster Instruments

Calculate hydrant flow from pitot readings using Hose Monster-style K-factors, generate a supply curve, and export a PDF report. All flows and pressures are approximate – always confirm against Hose Monster charts, NFPA 291 and local requirements.

Inputs

Project & hydrant information

Project name

Project address

Inspector / Company

Job / Work order #

Hydrant ID / Tag

Date

GPS latitude (optional)

GPS longitude (optional)

Notes / location description

Units

Test temperature (optional)

For record only, not used in calc.

Hose Monster / device model Device K-factor (approximate, per manufacturer)

Used in Q = K × √P, with P in psi (or kPa converted) and Q in gpm. Confirm K against Hose Monster data sheets.

Static pressure

psi

Residual pressure

psi

Pitot pressure (at Hose Monster)

psi at pitot

Elevation difference (hydrant to pitot)

ft (positive = pitot above outlet; approx correction only)

Results

Flow at pitot (Q)–

Corrected flow (Q_corr)–

Static pressure–

Residual pressure–

Flow at 20 psi (Q₂₀)–

Supply exponent (n)0.54 (assumed)

Status–

Hydrant location

Use your phone GPS or tap on the map to set the hydrant position. Latitude and longitude above will update automatically.

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Notes

• Q is calculated using Q = K × √P, with K approximated per selected device model.
• Flow at 20 psi is extrapolated using NFPA-style formula with n ≈ 0.54 – confirm against NFPA 291 and local requirements.
• This tool does not replace manufacturer Hose Monster charts – always confirm K-factors and flows with their published data.
• Use results for scoping only; final design should be based on signed test reports and approved procedures.