The professional toolkit for UK gas engineers. Calculate installation volume, permissible pressure drop and purge volume — then export a full audit-trail PDF, all to the current IGEM/UP/1B Edition 4 standard.
Accounts are created by an administrator
Enter the pipework, meter and observed pressure drop. The calculator handles the standard, the maths, and the paperwork.
Sum pipework runs across common copper and steel sizes (8mm to 2"), add meter and other volumes, get IV in m³ instantly.
Pass/fail verdicts for Natural Gas, LPG and LPG/Air using the Edition 4 permissible-limits tables — no lookup required.
Automatic 0.25 mbar / 0.2 mbar threshold based on your gauge type (water, 1-dp or 2-dp electronic).
PV = 1.5 × IV, plus purge time estimates using the meter's gas rate — ready for your on-site record.
One-click report including engineer, business, job ID, client, site, signature, entered inputs and SI conversions.
Every generated PDF and test record is saved to your private account — searchable and available across devices.
Scan meter serial numbers with your phone camera to eliminate typing errors on the audit trail.
Optional guided mode walks you through the IGEM/UP/1B procedure with clause references at every step.
Install to your phone or desktop home screen and keep working on-site without an internet connection.
Three core checks sit behind every tightness test. Here is what each one means in plain language.
The total volume of gas contained in the pipework and meter you are testing. The app adds up each pipe run, the meter volume and any extra fittings, then converts everything into cubic metres (m³). This figure drives the rest of the test.
IV = pipework volume + meter volume + other volumes
How much the pressure is allowed to fall during the test. The app compares your observed pressure drop against the Edition 4 limits for the fuel gas and installation volume. It then gives a clear PASS or FAIL verdict.
PASS if observed drop ≤ permissible limit
The minimum volume of inert gas or fresh air needed to clear the installation safely before re-commissioning. The app uses the standard multiplier and your IV to calculate it, plus an estimated purge time based on the meter gas rate.
PV = 1.5 × IV
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