What is IGEM/UP/1A?
It is the industry procedure for testing and purging larger and commercial gas pipework, covering strength, tightness and purge for installations beyond the domestic scope.
IGEM/UP/1A
Strength, Tightness & Purge (IGEM/UP/1A)
This certificate records the strength test, tightness test and purge carried out on larger or commercial gas pipework to the industry procedure IGEM/UP/1A. It confirms the installation is safe and sound before it is commissioned.
IGEM/UP/1A applies to installations that fall outside the scope of the simpler domestic procedure, covering larger meter capacities and pipework.
TradePlanr lets you record the strength, tightness and purge details on your phone, capture your calculated volumes and readings, and issue a professional PDF.
Issue this certificate from your phone
TradePlanr generates this and 35+ other gas, electrical, oil, plumbing and renewables certificates as proper PDFs — filled on site, signed on screen and stored against the job. Works even with no signal. Free to download.
What it covers
- Premises, responsible person and engineer details, with Gas Safe registration
- Installation details, including pipework size, volume and meter capacity
- Strength test pressure and result confirming pipework integrity
- Tightness test pressure, duration, permitted and actual pressure drop
- Purge calculation, method and confirmation of a safe purge
- The pass or fail result and confirmation the installation is safe to commission
- The standard satisfied: IGEM/UP/1A for larger and commercial gas pipework
When it's required
This procedure is used for larger and commercial gas installations, typically where meter capacity or pipework volume exceeds the limits of the domestic procedure. It is carried out when new pipework is installed or altered.
Testing and purging to the recognised procedure is part of safe commissioning and provides documented evidence that the installation meets the required standard before use.
The work must be carried out by a Gas Safe registered engineer holding the relevant qualifications for the installation being tested.
How to issue it in TradePlanr
- 1
Create the job
Open TradePlanr and start a job for the premises, adding the responsible person and installation details.
- 2
Pick the IGEM/UP/1A template
Select the strength, tightness and purge template so the test and purge fields are ready.
- 3
Record the tests on site
Enter the strength test result, tightness test pressures and pressure drop, and the purge calculation and method.
- 4
Sign and send the PDF
Sign on screen and send or store the completed certificate as evidence the installation is safe to commission.
Frequently asked questions
When do I use IGEM/UP/1A instead of UP/1B?
UP/1A is used for larger and commercial installations, typically where meter capacity or pipework volume exceeds the limits covered by the domestic UP/1B procedure.
Who can carry out a strength, tightness and purge test?
A Gas Safe registered engineer with the relevant qualifications for the installation must carry out and certify the tests.
Can I record the certificate on my phone?
Yes. TradePlanr lets you enter your test and purge results on site, sign on screen and send the PDF immediately.
Related certificates
Gas Tightness (Soundness) Test Certificate
The let-by and tightness test record for domestic gas installations to IGEM/UP/1B.
Commercial Gas Safety Record (CP1)
The commercial gas installation safety record (CP1) for non-domestic appliances.
Catering Appliance Safety Record (CP42)
The commercial catering gas safety record (CP42) for kitchens and catering appliances.
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