• Published: 25 Jun 2015
  • Incident ID: 3715

Gas release from stainless steel pressure switch

Cause & Consequence

  • Uncontrolled release of a flammable gas or liquid
Incident Consequence
Hydrocarbon release

Incident Location

Fixed Installation

Incident Activity

Production operations

Specific Incident Equipment

Stainless steel pressure switch being used in the fuel gas supply line to a turbine.

Lessons Identified

Water ingress can find a path between flange and pressure switch bodies, running onto threaded stud connections, creating a corrosion cell resulting in chloride stress corrosion cracking. If the bolts are a lower grade stainless steel and/or the temperature in the area is high, this can accelerate the problem.

Incident Recommendations

It is recommended that the cap screws are replaced with a material more resistant to chloride stress corrosion.

Rate this alert

Average Rating

Latest Alerts & Moments

Our searchable catalogue of hundreds of Safety Alerts and Safety Moments are all designed as learning resources that can help improve workplace safety.