HSE issues reminder of the risks and precautions associated with tank cleaning operations

Following the incident at the Chevron Pembroke Refinery on 2nd June, HSE, on behalf of the COMAH Competent Authority, has issued a reminder to site operators of the dangers associated with this type of operation and of the guidance available to ensure the work is undertaken safety.

Tank cleaning operations were in progress within the amine recovery unit at the refinery site when there was an explosion and subsequent fire. The incident led to the death of four people and serious injuries were sustained by another person. The joint police and COMAH Competent Authority investigation team is working to establish the cause of the incident.

The risks associated with tank cleaning are widely recognised in the major hazard industries and there are well established control measures. These are outlined in:

• Safe maintenance, repair and cleaning procedures, Dangerous Substances and Explosive Atmospheres Regulations 2002. Approved Code of Practice and Guidance, L137, HSE.


• Guidance on permit-to-work systems: A guide for the petroleum, chemical and allied industries, HS(G)250, HSE, and


• Code of Safe Practice Part 16 - Tank Cleaning Safety Code.Energy Institute, 20085

Site operators should review their arrangements for cleaning tanks that contain hazardous substances and ensure that they meet current good practice.