Gas escape or explosion during installation, testing or commissioning
risk assessment
A written risk assessment for gas escape or explosion during installation, testing or commissioning on a UK construction site: who is at risk, what goes wrong, how likely and how bad before and after controls, and the control measures that bring the score down. Copy it into your RAMS and change what does not fit.
What goes wrong
Explosion and fire causing fatality and serious injury to multiple persons; structural damage; evacuation of the building.
Control measures
- Work carried out only by a Gas Safe registered engineer holding the correct ACS category for the appliance and installation type.
- Gas supply isolated at the meter before altering pipework.
- New pipework purged before appliance connection.
- Tightness test carried out to IGEM/UP/1B before the installation is put into use.
- No naked flame or hot work carried out near an unpurged system.
Where this sits in a RAMS
- The risk assessment names the hazard, who it can hurt, how badly, and what you will do about it. That is this page.
- The method statement then says how the work is actually done, step by step, with these controls built into the steps rather than listed at the end.
- The people doing the work read it and sign it before they start. Keep the signed copy with the job, and review it when anything changes.
Questions people ask
Do I need a written risk assessment for gas escape or explosion during installation, testing or commissioning?
If you employ five or more people, the significant findings of your risk assessments must be written down (Management of Health and Safety at Work Regulations 1999, regulation 3). Below five it is still expected on any managed site, and every principal contractor will ask for it as part of your RAMS before you start. Guidance, not legal advice.
How is the risk score worked out?
Likelihood (1 to 5) multiplied by severity (1 to 5). This hazard scores 2 × 5 = 10 before controls (high) and 1 × 5 = 5 with the controls in place (medium). The residual score is what you are accepting when you sign the RAMS off.
Can I copy this into my own RAMS?
Yes. It is written as a starting point. Change what does not match your site, add anything specific to the job, and make sure the person signing it off has actually read it. A risk assessment nobody edited is the first thing an inspector notices.
Who should carry out the risk assessment?
A competent person: someone with the training, knowledge and experience to recognise the hazards in that work and judge the controls. On most small sites that is the supervisor or the contractor themselves, with the people doing the job involved. Guidance, not legal advice.
How often should it be reviewed?
Whenever the job, the site conditions, the plant or the people change, after any incident or near miss, and at least annually so it does not go stale. Date every review.
Build the whole RAMS in ten minutes
Type the job and the trade, and SiteLynx drafts the scope, pulls hazards like this one from the library with their controls, lays out the method steps and puts it in front of your team to sign on their phones. Every plan is 14 days free.
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