A boiler superheater safety valve is set to...

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Question 1 of 205eccefa0bacbc34ba4d46d66

A boiler superheater safety valve is set to lift at 450 psi (3102 kPa). Coast Guard Regulations (46 CFR) require that if there is a pressure drop of 10 psi (69 kPa) across the superheater, the drum safety valve should set to lift at a pressure of __________.

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🔍 Key Concepts

• 46 CFR requirements for setting safety valves on boilers with superheaters • Relationship between superheater safety valve set pressure and steam drum safety valve set pressure • Effect of a pressure drop across the superheater on the proper drum safety valve setting

💭 Think About

• If the superheater safety valve must protect the superheater from overpressure, should it lift at a higher or lower pressure than the drum safety valve? • Given a 10 psi drop across the superheater, how should the drum safety valve setting compare to the superheater safety valve setting so that steam flows correctly from the drum through the superheater? • Work out: starting from the superheater set pressure (450 psi) and a 10 psi drop, what pressure would exist at the drum when the superheater valve is about to lift?

✅ Before You Answer

• Be clear which component (drum vs superheater) is at higher pressure when steam is flowing through a restriction with a pressure drop. • Confirm whether the drum safety valve generally lifts before or after the superheater safety valve in normal protection schemes. • Check that the final chosen pressure maintains at least 10 psi difference between drum and superheater at the moment of lift, in the correct direction.

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