Vessels & Tanks

Hydrostatic Test Pressure Planning Calculator

Apply a user-confirmed test factor, optional stress ratio and liquid-head correction to plan a hydrostatic test target.

“The design pressure is 1,000 kPa. What target follows from the approved factor and gauge location?”

Core formulae

Hydrostatic test planning reference

Reference-point targetP_ref = P_design × factor × stress ratio

Liquid head correctionΔP = ρ g Δz

Gauge targetP_gauge = P_ref + ΔP

Simple arrangement sketch

Vessel and gauge elevation

Approved test basis

This calculator will not choose the statutory or standard test factor for you.

Design / reference pressurekPaConfirmed test factor1.50 is an example starting input only. Verify the applicable standard edition, repair basis and inspector-approved procedure.Allowable-stress ratioUse 1.00 only where no temperature-dependent stress correction is required by the approved basis.Test fluid densitykg/m³Gauge below reference pointmPositive if the pressure gauge is lower than the point where the target pressure is specified.

Results

Pressure planning result

Target at reference point1,500 kPa

Hydrostatic head correction0 kPa

Target at gauge location1,500 kPa

Equivalent gauge target15 bar

Do not use this page to set a vessel test pressure by itself

The exact hydrotest pressure, upper pressure limit, metal temperature, venting, hold period, inspection sequence, calibrated instrumentation and post-repair requirements must come from the applicable standard, vessel documentation and approved test procedure.

Method

Reference target = reference pressure × entered test factor × entered stress ratio. Gauge target then adjusts for the entered vertical liquid head.

Job-file record

Save the calculation, not just the number.

Copy a permalink that reloads these inputs, or download a PDF record with inputs, visible results, assumptions, a sensitivity note, date and disclaimer.

Important boundary

A calculator can show the arithmetic. It cannot establish every requirement that applies.

Confirm the actual equipment, loading, materials, condition, jurisdiction, contractual requirements, standard edition and current project documentation before using the result for design, repair, testing or lifting decisions.

Ask an engineer about this calculation →