TRUE or FALSE: It is acceptable to operate a process that you know may exceed the temperature rating of the equipment as long as sufficient relief devices are installed.

TRUE or FALSE: It is acceptable to operate a process that you know may exceed the temperature rating of the equipment as long as sufficient relief devices are installed.

• A. True
• B. Only relief devices are certified
• C. False
• D. Only if the process is non-hazardous

Answer: (C)

Exceeding the temperature rating of equipment is unsafe because that rating is the limit for which the equipment’s materials, joints, seals, insulation, and overall design have been proven to perform safely. Relief devices protect against pressure surges, not heat buildup. Relying on relief valves or rupture disks to compensate for overheating can still allow the process to reach unsafe temperatures, degrade materials, cause leaks, or trigger uncontrolled chemical reactions. Heat can drive thermal runaway, change reactivity, or damage containment even if pressure relief is active. Therefore, you must keep operation within the equipment’s temperature rating or redesign/use equipment rated for the higher temperature and implement appropriate controls (cooling, interlocks, alarms) to prevent exceedance.

Exceeding the temperature rating of equipment is unsafe because that rating is the limit for which the equipment’s materials, joints, seals, insulation, and overall design have been proven to perform safely. Relief devices protect against pressure surges, not heat buildup. Relying on relief valves or rupture disks to compensate for overheating can still allow the process to reach unsafe temperatures, degrade materials, cause leaks, or trigger uncontrolled chemical reactions. Heat can drive thermal runaway, change reactivity, or damage containment even if pressure relief is active. Therefore, you must keep operation within the equipment’s temperature rating or redesign/use equipment rated for the higher temperature and implement appropriate controls (cooling, interlocks, alarms) to prevent exceedance.