🔍 Key Concepts

• Boiler hand holes and gaskets – how a gasket is supposed to sit and seal under pressure • Seating surfaces – what happens if they’re damaged, dirty, or uneven • Dogs (clamps) – their role in applying even pressure to the gasket

💭 Think About

• Think about all the different things that must go right for a gasket to seal properly: position, surface condition, and clamping force. Which of the options listed could realistically interfere with that seal? • Ask yourself whether each choice (A, B, and C) by itself could reasonably cause leakage around a hand hole, based on how gaskets work. • Consider whether exam questions on causes of leakage often focus on only one factor or on the combined effect of several possible issues.

✅ Before You Answer

• For each option A, B, and C, verify whether it would reduce or disturb the uniform pressure on the gasket sealing surface. • Check whether any one of the listed conditions would be sufficient to cause a leak, or if only a combination would. • Confirm that you understand what "dogs" are on a boiler hand hole and how improper tightening affects gasket compression.