This policy, first issued on 7th July 2006, provides clear guidance on inspecting, testing, and purging industrial and commercial pipework installations. It applies to tightness testing, strength testing, and purging of natural gas systems.

Applicable Standards

We strictly adhere to the following standards:

• IGE/UP/1A (Edition 2, 2005): For systems with a maximum operating pressure (MOP) up to 16 bar.
• IGE/UP/1 (Edition 2): For systems exceeding 16 bar MOP, along with Communications 1701 and 1683.

Scope of Testing

Both new installations and modifications to existing systems require tightness and strength testing. These tests may be conducted concurrently, as detailed in Section 4.2 of the procedure.

Process of Gas Tightness Testing

Gas tightness testing involves the following steps:

1. Surveying pipework from the emergency control valve to each appliance.
2. Determining and documenting key parameters:
   • Installation volume (IV).
   • Tightness test pressure (TTP).
   • Tightness test duration (TTD).
   • As-finished drawings and gas schematics.
3. Isolating gas appliances during testing, as outlined in Section 5.7.4.

Addressing Issues During Testing

If a pressure drop exceeds allowable thresholds (refer to Table 5 of the procedure), testing will halt until the leak is located and repaired. After resolution, the test will continue to completion.

Certification and Documentation

Upon successful completion of testing, results are recorded in the client's Logbook Portal. A Gas Safety Inspection Certificate is issued to confirm system integrity and compliance. This serves as a critical document in proving the safety and reliability of the pipework system.

Commitment to Safety

Our procedures prioritise safety, ensuring that systems meet or exceed regulatory requirements. By adhering to rigorous standards, we protect personnel and facilities while maintaining operational efficiency.