Safety Alert
Failure of a road tanker pressure/vacuum relief valve
Failure of a road tanker pressure/vacuum relief valve
- HSE
- Safety Alert
- CEMHD2-2020
- Inspection and MaintenancePressure SystemsVehicles and Driving
- Hazardous substancesLoss of containmentMechanical failurePressure systems
- Inspection and maintenancePressure testingVehicles and driving
- Valve
- Competence and trainingFunctional testingPressure reliefPreventive maintenance
Summary
HSE safety alert describes a modified road-tanker relief valve that stuck open, releasing nitric acid vapour without injuries or property damage. A welded nut obstructed the valve stem. It calls for visual checks for unauthorised modifications, manufacturer-guided servicing and verification of both pressure and vacuum protection functions.
Classifications: Hazardous substances; hazardous chemicals; chemical exposure.
Classifications: Loss of containment; containment loss.
Classifications: Mechanical failure; equipment failure.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Pressure testing; hydrostatic testing; pneumatic testing.
Classifications: Vehicles and driving; driving; road transport.
Classifications: Valve; valves.
Classifications: Competence and training; competency assurance; safety training.
Classifications: Functional testing; function test.
Classifications: Pressure relief; overpressure protection.
Classifications: Preventive maintenance; preventative maintenance; planned maintenance.
CEMHD2-2020. Themes: inspection and maintenance, pressure systems, vehicles and driving.