Gas Testing & Purging

Tightness testing is a safety-critical process carried out on existing pipework to ensure your gas pipework and installations are in a sound condition and safe to use. The test is carried out at a set pressure as per GSIUR 1998 using calibrated equipment to monitor any loss in pressure no matter how small and rectify if necessary.

We would advise that all gas pipework should be inspected and tested annually. Often this is a requirement of your building insurance to validate the policy.

Strength Testing (STP):

New commercial & industrial pipework should undertake a Strength Test (STP) which is carried out above the normal operating pressure to identify any construction faults with the new pipework installation.

What you can expect from a Strength Test:

Survey of installation – inspection & removal of any component that may be damaged by the test pressure & test separately

Calculation of the volume of the installation

Determine test pressure & period

Preparation for the test including full health & safety briefing/assessment

Pressurise system and complete strength test

Analyse test readings to determine whether installation is gas-tight & safe

Checking if there are any joints in hazardous or unoccupied spaces.

Completion of documentation



The purging of commercial & industrial gas pipework from gas to air is carried out to displace the combustible gasses with an inert mixture via a series of calculations, purge stack & safe working systems. This procedure would then ensure that any decommissioned pipework is safe to be dismantled or left open to the atmosphere without constituting a danger.


The purging of commercial & industrial gas pipework from air to gas is to ensure the perfect air/gas mixture is passed through the pipework without causing any hazards such as stratification or enveloping within the gas lines. The incorrect mixture at the incorrect rate will lead to appliance failure, explosive ignition, etc.

What you can expect from Purging:

Carry out a thorough risk assessment

Set up safe systems of work including barriers & signage

Set up purge stack & monitoring equipment

Calculate purge volumes & purge medium (air/gas/nitrogen)

Ventilate purge area & extinguish any naked flames or sources of sparks

Isolate appliances if applicable

Carry out purge as per appropriate IGEM/UP standards

On completion of purge, remove testing equipment from system and reconnect or plug pipework connection points

Complete all appropriate paperwork & certify purge

Steps to start your project


Analysing & Quantity Surveying


Planning &


Interim Checks
& Reports




Project Execution
& Handover

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