Hydrotest Water Quantity Calculator

Hydrotest Water Volume Calculator

Calculate fill water required for HVAC piping pressure tests — chilled water, condenser water & heating systems

HVAC Piping · MEP Engineering

Pipe segments

Pipe size Int. dia (mm) Length (m)

Additional volumes & margin

Equipment & fittings volume (liters)

Safety margin 5% — Minimal 7% — Standard 10% — Recommended 15% — Large system

Always add fittings, valves, coils, heat exchangers and expansion tank volumes separately. Margin covers air venting, hose losses & flushing.

Please check all pipe segment fields.

Results

Pipe volume

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liters

+ Equipment

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liters

Total fill volume

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liters (with margin)

Segment	Int. dia (mm)	Length (m)	Volume (L)

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Formula reference

V = (π / 4) × D² × L × 1000

V = volume in liters  |  D = internal diameter in meters  |  L = pipe length in meters

Hydrotest pressure = 1.5 × working pressure (verify against project spec & local standards)

Quick reference — liters per meter of pipe

Pipe size	Internal dia (mm)	Volume per meter
DN25	24.3 mm	≈ 0.46 L/m
DN50	52.5 mm	≈ 2.16 L/m
DN80	80.9 mm	≈ 5.14 L/m
DN100	102.3 mm	≈ 8.22 L/m
DN150	154.1 mm	≈ 18.67 L/m
DN200	202.7 mm	≈ 32.29 L/m

HVAC Hydrotest Water Calculator  ·  MEP Engineers Club  ·  Based on schedule 40 internal diameters