🔍 Key Concepts

• Purpose of a hydrostatic test on a boiler and how it differs from normal steam operation • How safety valves are designed to operate (spring-loaded, set pressure) • Standard practice for temporarily securing safety valves during a pressure test

💭 Think About

• During a hydrostatic test, is the boiler under steam pressure or water pressure, and how does that affect the behavior of safety valves? • Which option represents a temporary mechanical restraint that can be removed after the test, rather than a permanent change to the valve’s calibration? • What would be the safety implications of changing the spring pressure settings just for the test?

✅ Before You Answer

• Verify which choice involves a removable device or method used only during testing and does not alter the valve’s set pressure • Eliminate any option that would recalibrate or misadjust the safety valve from its certified set pressure • Consider standard marine boiler practice: how are safety valves normally kept from lifting only during hydrostatic tests?