TRUE or FALSE: A temperature rise will not pose a hazard as long as the equipment temperature rating is not exceeded.

• A. True
• B. Only if pressure involved
• C. False
• D. Depends on material

Answer: (C)

A rise in temperature can create hazards even if the vessel’s temperature rating isn’t exceeded. The rating protects the equipment itself, not the chemical system inside. If heat generation within the contents outpaces the ability to remove that heat, the temperature can climb and drive dangerous outcomes—faster reaction rates, thermal decomposition, unwanted side reactions, or phase changes. These changes can occur before the vessel rating is reached and may lead to pressure buildup, release of toxic or flammable byproducts, or ignition risks. Temperature rise is therefore a safety concern on its own, not something that disappears just because the rating isn’t breached. The statement is false.