INDEPENDENT ENGINEER TOOL BY ESSENTIAL
IGEM/UP/1B
Calculator.
Gas tightness. Clear calculations. Bring installation volume, purge volume and your readings into one focused engineer tool.
Calculate without an account. Sign up with your email to save sample records.
- Natural gas
- LPG
- LPG/air
FROM INPUT TO RECORD
Keep the numbers.
Keep the context.
A focused workspace for the calculation, the readings and the record that brings them together.
- 01
Build your installation
Add copper and steel pipe lengths, then select the meter included in your test. See a breakdown of the calculated volume.
PIPEWORK · FITTINGS · METER - 02
Give the reading its context
Select the gas, gauge and test setup. Record readings together while you inspect the calculation and its stated limits.
GAS · GAUGE · TEST MODE - 03
Bring the record with you
Create a free account to save and reopen sample results in your workspace. An Essential subscription adds numbered reports and PDF downloads.
SAVE FREE · REOPEN · UPGRADE
YOUR EMAIL. YOUR WORKSPACE.
One calculation today.
A record you can find tomorrow.
Give your sample work a home. Create an account with your email address, then keep calculator records together with your other Essential documents.
Create free accountSave and reopen results free. PDF and report downloads are included in the all-inclusive £24.99/month Essential package. Up to 2 engineers are included; each additional engineer costs £5.00/month. Payments remain disabled.
Explore Essential plansGAS TIGHTNESS TEST RECORD
Every reading.
One job record.
- Job
- Your reference
- Engineer
- Your details
- Test record
- Saved in your workspace
Is the gas calculator free?
The on-screen calculator is free without an account. A free email account lets you save and reopen your sample results. Creating numbered reports and downloading results or PDFs requires an active Essential subscription. Editable JSON recovery backups remain available to preserve your data.
What does the calculator include?
It calculates installation and purge volume from the available pipework and meter inputs, and provides a limited pressure-drop comparison using the selected gas, gauge and test mode. It includes natural gas, LPG and LPG/air selections. Its assumptions and limits are shown inside the tool.
What changed with IGEM/UP/1B Edition 4?
IGEM states that Edition 4 became effective on 1 October 2026, following the withdrawal of Edition 3. This calculator references Edition 4 and makes its input assumptions visible for review. It does not replace the full standard or its procedures. Read the official IGEM publication.
Is this the official IGEM/UP/1B app?
No. This is an independent Essential Heating Services Limited tool that references IGEM/UP/1B Edition 4. It is not affiliated with, endorsed by or approved by IGEM or Gas Safe Register. Use the full current standard and its applicable procedures.
Can I use this for live gas-safety work?
This version is for sample testing and technical review only. It must not be used to make live gas-safety decisions. A competent reviewer must validate the tool against the licensed current standard before professional release.
Can I keep more than one test in a record?
Yes. You can add the readings for a job to a combined record, save it with a free account and reopen it later. An active Essential subscription is required to create numbered sample reports and download reports or PDFs. Editable JSON recovery backups preserve your original data.
Which plan includes PDF and report downloads?
Calculator PDF and report downloads are included in the all-inclusive £24.99/month Essential package; there is no separate calculator subscription. Up to 2 engineers are included; each additional engineer costs £5.00/month. Payments are currently disabled, so you cannot purchase or activate a subscription here yet. View Essential plans.
How does this connect to Essential certificates?
Your Essential workspace brings sample calculator records and certificates together. The certificate package setup collects company and engineer details for your documents. Explore the full Essential package.
CLEAR ABOUT THE LIMITS
A calculation supports the engineer.
It does not replace the procedure.
Technical review and independent sign-off are outstanding. All generated records retain their sample markings. The tool cannot verify an installation, the equipment used or how a test was carried out.
Read IGEM’s official Edition 4 scopeSTART WITH THE NUMBERS