The Gas Testing & Purging Record is for testing and purging a gas installation, not for inspecting appliances. Use it when you strength test, tightness test or purge the pipework, for example before commissioning a new install or recommissioning an existing one. It records the readings you took and the result you called, then hands the customer a clear PDF of the work.
When to use this one
- A tightness test and purge on a home or other small installation (IGEM/UP/1B Edition 4).
- A tightness test on a medium commercial installation (IGEM/UP/1A).
- A strength test, tightness test and purge on a larger installation (IGEM/UP/1).
- Any standalone gas test or purge that needs a record, on its own or as part of a bigger job.
This is a test record of the installation, so it has no appliance list. If you are inspecting appliances for a landlord, use the CP12 instead. If you are servicing an appliance, the Boiler Service Record or Service & Maintenance Record fits better. They all live side by side, so pick whichever matches the job.
Start the record
You can start one two ways:
- From the job. Open the job from Jobs and use the Gas Certificates card. Starting it here links the client, the property and the engineer for you.
- From the Gas Certs page. Go to Gas Certs, tap New certificate, and pick Gas Testing & Purging Record.
Fill it in
Work down the form on site:
- Test details. Set the test date. The engineer's and the workspace's Gas Safe numbers are checked here, since every gas record carries them.
- Client and property. Link the client and the property the work covers.
- Work undertaken. Pick every procedure you carried out: Strength test, Tightness test or Purge, in any combination. Only the test sections you choose appear below, so a tightness-only job never asks you for the strength fields.
- Tested to. The standard you worked to. A new record starts on IGEM/UP/1B Edition 4, the only edition since 1 October 2026, which covers installations up to 0.035 m³ with a meter up to 16 m³/h. Change it to UP/1A or UP/1 for a bigger installation. Gas Safe Register asks for the edition on the work record, so it prints in the heading of the tightness and purge sections.
- Strength test. Method, installation type, test medium, the strength test pressure, durations, the permitted drop and the actual drop, then the result you call.
- Tightness test. Gas type, meter details, the installation volume, the tightness test pressure, the let-by and test durations, the gauge you used, the maximum permitted leak or drop, and the actual drop and leak rate, then the result. There is a yes/no for whether the weather or temperature could affect the test, so a marginal result has the conditions recorded alongside it.
- The pipework-only retest (Edition 4). If the gauge moved at all with the appliances connected, Edition 4 has you isolate the appliances and test the pipework on its own, where no movement is allowed. Only once the pipework is proven does the first reading get compared with the limit for the installation volume. Record which happened: Not needed (no movement first time), Done (then put in the drop on the pipework alone), or Could not isolate the appliances (then the test with them connected needs no perceptible movement at all). It prints on the record, so the two readings are there if anyone asks.
- Edition 4 notes beside your readings. Pick a water gauge and Mucka reminds you that up to 0.25 mbar counts as no perceptible movement; on an electronic gauge reading to 0.1 mbar it is 0.2 mbar. A natural gas test pressure under 20 mbar gets a note too: Edition 4 allows a test from 18 mbar, and if it passes at that you then check the operating pressure to IGEM/G/13. These are reminders, never the result.
- Work out the installation volume instead of typing it. Tap Work it out next to the total installation volume. Tell it the meter and the pipe runs and it fills the volumes in for you, plus the maximum pressure drop you are allowed for that volume, all to IGEM/UP/1B Edition 4, the only edition since 1 October 2026. Full walkthrough: Work out installation volume and purge volume.
- Purge. A pre-purge safety checklist (risk assessment, signs, persons advised, bonding and so on), the purge volumes, the final oxygen or LFL reading, and the result. Under Edition 4 Mucka says beside the purge volume whether it goes to air or to ignition: natural gas up to 0.02 m³ of purge can go to air, anything bigger and all LPG goes to ignition. The same Work it out sits next to the total purge volume, and one calculation fills the tightness and purge figures together, so you only enter the pipework once.
- Pressures use a locked unit. Tap the unit to switch between mbar and bar so a reading can never be read as the wrong scale. Mucka shows an advisory note if a reading looks outside the usual range, but it never overrules you: the result is always your call.
- Declaration. Record the overall result, add any comments, and sign on screen. If the installation was left unsafe, note the Warning Notice serial in the comments. The customer can sign for receipt too, but they do not have to.
Everything saves as you go, so you can put your phone down mid job and pick up where you left off, even on a different device.
Approve and send
Tap Approve when it is done. Mucka shows you the outcome and asks you to confirm. Approving locks the record as a legal document and generates the PDF. After that it cannot be edited, only corrected.
Then tap Send. Mucka pre-fills the recipient and attaches the PDF. Check the message, then send.
Need to fix an approved record?
You cannot edit a locked record, but you can tap Amend, on the certificate itself or along the bottom when you open it from a job, a customer or a property. That copies it into a fresh draft with a new serial number; once you approve the correction, the original is marked superseded and its PDF carries a "superseded" watermark. The original is never deleted.
Ask Mucka
You can ask Mucka to get one started for you:
"Record a tightness test and purge for the install at 88 Bradford Road."
Mucka opens the draft and links it up, but it never approves or sends a record on its own. Filling in the readings, approving and sending are always your call.