June, 2010

201029JunAll DayOperators of COMAH Oil or Fuel Storage SitesSafety Alert HID 6-2010 Origin: HSE Lessons:Asset integrity,Compliance with StandardsIndustry:StorageLanguage:EN TagsOverfill Protection,Storage Tanks


This safety alert is primarily for the attention of those companies operating oil/fuel storage in large tanks and may be relevant to other sites storing hazardous substances in large tanks

The investigation into the fire and explosion at the Buncefield oil terminal depot on 11 December 2005 is continuing. Enquiries into the workings of the high level safety system to prevent tank overfill have indicated that certain aspects of its installation and testing are critical in ensuring that it works properly. Operators of similar establishments are therefore advised to carry out immediate checks where TAV level switches manufactured by Cynergy3 Components Limited and supplied by them, their predecessor companies, or others, are fitted to their storage tanks.

Operators should check TAV level switches fitted with change over (double throw) reed switches. These switches are normally used in ‘de-energise’ mode to maintain alarm/trip circuits in ‘normal’ status


HSEUK Health & Safety Executive