Understanding the CP16 Gas Certificate

For Commercial Pipework Tightness Testing & Purging

What a CP16 Entails

A CP16 Gas Safety Certificate is a crucial document for commercial properties. It's not a recurring annual check, but a specific certificate issued after gas pipework has been installed, altered, or repaired. Its purpose is to certify that the pipework is safe and ready for use.

  • Purpose: To confirm that gas pipework is free from leaks (tightness testing) and that any air has been safely removed and replaced with gas (purging).
  • Gas Safe Registered Engineer: This work must be carried out by a qualified engineer who holds the specific certifications for non-domestic pipework.
  • Tightness Testing: The engineer uses specialist equipment to pressure-test the pipework, verifying the integrity of every pipe and joint to ensure there are no gas leaks.
  • Purging: When new pipework is installed or old pipework is opened up, it fills with air. Purging is the process of safely forcing this air out with inert gas, and then forcing the inert gas out with natural gas, preventing the risk of an explosive air/gas mixture forming.
  • Certification: Upon successful completion, the engineer issues the CP16 certificate, which details the work done, the test results, and confirms compliance with safety standards like IGEM/UP/1A.

When is a CP16 Required?

You must obtain a CP16 certificate in the following situations:

  • After any new gas pipework is installed in your commercial property.
  • When any alterations or extensions are made to existing pipework.
  • Following significant repairs to the pipework infrastructure.
  • When bringing a long-decommissioned section of pipework back into service.

Why is a CP16 Important?

For any commercial landlord or duty holder, this certificate is a vital part of your safety management and legal obligations.

  • Safety: It is your proof that the pipework is sound and free from leaks, drastically reducing the risk of gas leaks, fires, and explosions.
  • Legal Compliance: The certificate demonstrates that you have fulfilled your duties under the Gas Safety (Installation and Use) Regulations 1998 by using a competent person to ensure the installation is safe.
  • Insurance Validity: In the event of a gas-related incident, your insurance provider will likely require this certificate to validate your claim. Without it, your policy could be void.

This webpage provides an overview of the CP16 Gas Safety Certificate.

Always ensure any work on commercial gas pipework is carried out by a correctly qualified Gas Safe registered engineer.

Information current as of July 17, 2025. Harrow, England, United Kingdom.

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info@cgsys.co.uk
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Gas Safety in UK Education Facilities
CP42 Commercial Catering Gas Safety Certificate
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Gas Safety in UK Education Facilities
CP42 Commercial Catering Gas Safety Certificate
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CP17 Gas Safety Certificate
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Gas Safety Systems for School Boiler Rooms
Commercial Boiler Plant Room
Food Technology Rooms
Laboratories
Services
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