In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?
• Hydrostatic test purpose and how pressure is applied to the boiler • Function of boiler vent valves when filling with water • Why safety valves and manhole/handhole covers must be handled carefully during tests
• When you first start filling a boiler with water for a hydrostatic test, what must happen to the air inside the boiler, and how is that accomplished? • During a hydrostatic test, are you trying to test the boiler with the safety valve in service, or are you normally isolating it from the test pressure? Why? • Is it good practice to over-tighten manhole/handhole covers before you know how the joints are seating under pressure, or do you normally tighten progressively as pressure comes up?
• Verify the primary reason vents are opened during filling for hydrostatic tests. • Consider standard practice for safety valves during hydrostatic tests: are they used to control pressure, or removed/blanked off so the test pump controls pressure? • Think about good maintenance practice: is maximum tightening before pressurizing recommended, or is gradual, even tightening as pressure is raised safer?
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