Coast Guard Regulations (46 CFR) require that the design pressure of an economizer integral with the boiler and connected to the boiler drum without intervening stop valves shall be at least equal to __________.
• 46 CFR requirements for power boilers and economizers (look in 46 CFR Part 52) • Meaning of design pressure versus test pressure and safety valve set pressure • Why an economizer that is integral with the boiler and has no intervening stop valves must be treated a certain way for pressure design
• Ask yourself: If there is no stop valve between the economizer and the boiler drum, what pressure can the economizer actually be exposed to in service? • Which of the answer choices is tied directly to the maximum operating pressure the boiler drum can see in normal operation, rather than to a special test or pump condition? • How do Coast Guard/ASME rules usually relate the design pressure of attached components (like economizers) to the safety valve setting on the drum?
• Check in 46 CFR Part 52 (Power Boilers) for the specific wording on economizers integral with boilers. • Verify which items in the choices are operating/relief-related pressures and which are test-only or pump-related pressures. • Confirm that the required design pressure is at least equal to a value that the boiler and drum will routinely or potentially reach in normal or relief conditions, not just during hydrostatic tests.
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