IOGP SAFETY ALERT

OVERPRESSURE OF AN EXPLOSION-PROOF ENCLOSURE

Corrective Actions and Recommendations:

• Recognize the potential hazard of trapped pressure in explosion-proof electrical enclosures from all sources of energy entering the enclosure
• Identify explosion proof enclosures which are susceptible to trapped pressure scenarios and do not have pressure indication or pressure relief protection
• Work with equipment manufacturers to develop a mitigation plan that addresses the trapped pressure situation while still maintaining the electrical certification of the identified enclosures

Figure 1: Re-enactment of cover removal

Figure 2: Example of Explosion-Proof Enclosure

safety alert number: 288
IOGP Safety Alerts https://safetyzone.iogp.org/