HSE Safety Alert on road tanker pressure / vacuum relief valves
HSE has issued a safety alert following an incident which saw the failure of a road tanker pressure / vacuum relief valve.
Bulk transport containers used for flammable, corrosive, and toxic liquids and gases will normally have a pressure / vacuum relief valve fitted to prevent damage to the tank from changes in the internal pressure. These valves should be inspected and maintained in line with the manufacturer’s instructions.
Following a road incident in April 2020, investigations by Cleveland Police and HSE found evidence that a pressure / vacuum relief valve had undergone an unauthorised modification by a third party which prevented the valve’s safe operation.