Safety Flash
Swivel ring flange failures
Swivel ring flange failures
- IMCA
- Safety Flash
- IMCA SF 01/00
- Pressure SystemsStructural and Asset Integrity
- Loss of containmentMechanical failurePressure systemsStructural and asset integrity
- Diving operationsInspection and maintenance
- Process pipework and pipelines
Summary
This flash warns divers about lightweight swivel ring flanges whose rings or hubs lacked adequate strength. Additional bolt loading can worsen leakage, with failures reported during tightening or subsequent thermal or mechanical loading. It describes a general ring-thickness comparison with mating weld neck flanges.
Classifications: Loss of containment; containment loss.
Classifications: Mechanical failure; equipment failure.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Structural and asset integrity; asset integrity; structural integrity.
Classifications: Diving operations; diving; commercial diving.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Process pipework and pipelines; process piping.
Summary
A safety flash warning that defective swivel ring flanges can fail during tightening or under external loads.
IMCA SF 01/00. Themes: pressure systems, structural and asset integrity.