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Questions and Answers
What professional should determine the actual firing rate of the boiler?
What professional should determine the actual firing rate of the boiler?
What type of explosions can occur in a furnace?
What type of explosions can occur in a furnace?
In most jurisdictions, what is required following a furnace or pressure vessel explosion?
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?
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?
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.
