Question 184Steam Plants - 1st Asst/Chief

70% to pass

Which of the precautions listed should be taken when gagging a boiler safety valve?

ATighten the gag only finger tight to prevent damage to the valve stem, disc or seat.
BTighten the gag only with the special wrench supplied with the gag.
CDo not allow the gag to contact the safety valve stem.
DEnsure that all moving parts of the safety valve are free to move before installing the gag.
AI Explanation

The correct answer is A) Tighten the gag only finger tight to prevent damage to the valve stem, disc or seat. When gagging a boiler safety valve, it is important to only tighten the gag finger tight to avoid damaging the sensitive internal components of the valve. Overtightening the gag with a wrench, as option B suggests, could deform or jam the valve stem, disc or seat and prevent the safety valve from properly resetting and functioning. Additionally, the gag should not contact the valve stem directly, as option C warns against, as this could also interfere with the valve's operation. Ensuring the valve's moving parts are free to move, as in option D, is also a prudent step before installing the gag.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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