LPG / Central Gas/Testing guide

LPG Testing & Commissioning

Commissioning is not opening the gas and lighting a burner. It is a verification sequence proving the network is tight, the pressure is correct at every appliance, and the protection system actually works rather than merely exists.

Gas network drawing and test documentation on a work table

Pre-test verification

  • Installation matching the approved drawing and pipe routes.
  • Valves, regulators, filters and isolation points fully installed.
  • Detectors, panel and solenoid valve installed and electrically connected.
  • Clear identification labels for valves and shut-off points.
  • No incomplete work or open ends anywhere on the route.

Tightness and pressure testing

The network is isolated, pressurised and monitored for a pre-agreed period. A stable reading is the only acceptable proof of tightness. Any drop requires locating and repairing the leak and repeating the full test, and no part of the route is covered until the test passes.

Purging and gas introduction

Before commissioning, air is purged from the network in a controlled manner to a safe discharge point, because an air/gas mixture inside the pipework is an undesirable condition. The step follows a defined order from the main line to branches then appliances, with ignition sources excluded from the area.

Setting regulators and verifying pressure

Working pressure is set and verified at appliances, including the most remote one and with several appliances running together. This is the test that exposes sizing or regulator-selection errors before they surface as an operational complaint months later.

Testing the protection system

  • Response testing of each detector and verification that its signal reaches the panel.
  • Confirming the solenoid valve actually closes on alarm.
  • Testing audible and visual alarms where staff are present.
  • Testing the manual shut-off button.
  • Verifying the reset procedure after the cause is cleared.

Handover and documentation

The system is handed over with as-built drawings, a documented test report, and a practical briefing for staff covering valve locations, the emergency procedure and how to respond to an alarm. Technical requirements are applied according to the specifications and regulations in force for the project and its approved design.

FAQ

Frequently asked questions

What is the difference between a tightness test and a commissioning test?

A tightness test proves the network does not leak; a commissioning test proves the system delivers correct pressure and flow and that the protection system responds. Passing the first does not replace the second.

Must testing be repeated after any modification?

Yes. Any opening of the network, appliance addition or route change reintroduces the possibility of a leak or a pressure change, so the relevant tests are repeated before returning to service.

Have a project or an existing facility that needs an engineering review?

Our engineering team can review your requirement and propose a solution suited to the application, the site and the applicable requirements.

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