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Questions and Answers
What professional should determine the actual firing rate of the boiler?
What type of explosions can occur in a furnace?
In most jurisdictions, what is required following a furnace or pressure vessel explosion?
What should the owner or operator do after an explosion as per the New Brunswick Boiler and Pressure Vessel Act?
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Why did the boiler shown in Figure 3 not pass inspection?
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Study Notes
Overpressure Events
- Occur when a safety valve fails to open or fails to stop boiler pressure from rising excessively
- Can cause boiler pressure to rise more than 6% above the highest pressure at which any valve is set
- Can cause boiler pressure to rise more than 6% above the maximum allowable working pressure
Safety Valve Capacity
- Determined by ASME BPVC Section I Part PG-67
- Must be able to discharge all steam generated by the boiler
- Must not allow pressure to rise more than 6% above the highest set pressure
- Must not allow pressure to rise more than 6% above the maximum allowable working pressure
Accumulation Test
- Used to ensure safety valve has adequate capacity
- Covered in PanGlobal Fourth Class, Part B, Unit 4, Chapter 4 Operational Checks
- Type of test: Side Track Accumulation test
Response to Overpressure Event
- Shut down the boiler
- Isolate, cool, and drain the boiler
- Inform the boiler inspector
- Determine the cause of the overpressure event before returning to service
Post-Overpressure Event Inspection
- Thorough internal and external inspection of the vessel
- Hydrostatic test to determine pressure vessel integrity
- Boiler shell and other pressure components must be deemed acceptable to return to service
- Safety valves must be removed, serviced, reset, and recertified by an approved agency
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Description
This quiz covers the regulations outlined in ASME BPVC Section I Part PG-67 regarding the pressure relief valve capacity for boilers. Topics include overpressure events, safety valve failures, and steam discharge requirements.
