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Non-Domestic Gas Testing & Purging Record (CP16)

A CP16 records the testing and purging of non-domestic gas pipework installations. It documents tightness testing results, purge procedures, and let-by checks on commercial gas systems. The record must be completed by a Gas Safe registered engineer with non-domestic qualifications, following IGEM/UP/1 procedures for safe purging.

Gas Safety (Installation and Use) Regulations 1998, IGEM/UP/1Valid: One-off (issued at completion)

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Sample CP16 certificate

Sample Non-Domestic Gas Testing & Purging Record (CP16) certificate created with CertBox, showing the professional PDF layout with pipework tightness test results and pressures, purge procedure and gas detection confirmation, let-by test on meter and emergency control valve

Sample CP16 with fictional data. All personal details shown are fake.

What it covers

  • Pipework tightness test results and pressures
  • Purge procedure and gas detection confirmation
  • Let-by test on meter and emergency control valve
  • Installation pipework details and materials
  • Test medium and equipment used
  • Safe commissioning sign-off

Who needs a CP16?

Commercial gas engineers
Facilities managers
Building contractors

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Frequently asked questions about CP16

How is a CP16 different from a domestic gas tightness test?
Non-domestic installations typically have larger pipe volumes and higher operating pressures. The CP16 follows IGEM/UP/1 procedures which require longer stabilisation periods and different pressure thresholds compared to domestic testing.
When is a CP16 required?
A CP16 is required after any new non-domestic gas pipework installation, after significant alterations or extensions to existing commercial pipework, or when recommissioning a system that has been disconnected.

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