If a boiler superheater safety valve is leaking at normal working pressure, the quickest method of determining and possibly solving the problem is to __________.
• function of a superheater safety valve and why it might leak at normal working pressure • use and purpose of hand lifting gear on safety valves • difference between changing firing rate and directly testing/clearing the valve seat
• Ask yourself: if a safety valve is leaking slightly at its seat, what quick action could clear any dirt or carbon from the seating surfaces without shutting down the boiler? • Which option allows you to test and exercise the valve mechanism itself, rather than changing boiler operating conditions? • Which choice can you carry out immediately, from the valve, with minimal effect on the rest of the plant?
• Identify which option directly operates the valve mechanism instead of just altering pressure or temperature. • Check which method is commonly used to clear foreign matter from a safety valve seat on board. • Eliminate any choice that simply masks the symptom (leakage) instead of verifying correct valve operation.
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