Whenever commercial gas pipework is installed, altered or repaired, it must be tested and purged before it can be used. We carry out the full process to current standards and issue a CP16 commercial testing and purging certificate on completion.
What gas testing and purging involves
Testing confirms the integrity of the pipework, while purging safely clears air or gas from the system so it can be commissioned without a dangerous mix. Our engineers carry the correct equipment and qualifications to test and purge installations of all sizes and pressures.
- Tightness testing — verifying there are no leaks across the installation.
- Strength testing — confirming pipework withstands the required pressure.
- Purging — safely removing air or gas before commissioning.
- Let-by and commissioning checks — ensuring the system is safe to operate.
- CP16 certification — full documentation issued on completion.
When do you need testing and purging?
Testing and purging is required after new pipework installation, alterations or extensions, repairs, decommissioning, or when bringing a previously isolated supply back into use. It's a legal requirement under the Gas Safety (Installation and Use) Regulations that this work is carried out by a qualified engineer.
Qualified and compliant
Our engineers hold the relevant TPCP1 / TPCP1A testing and purging qualifications and are Gas Safe registered. You receive clear, audit-ready certification suitable for landlords, managing agents, insurers and compliance records.
Related services
Testing and purging is often part of a wider commercial gas installation or underground pipework project. Need the formal paperwork? See commercial gas certificates.