Question 139Steam Plants - 1st Asst/Chief
70% to passAfter patching refractory with plastic firebrick, holes are poked in the patch on 1 1/2 inch centers in order to _______________.
Aallow for expansion
Bprevent slag buildup
Cprevent spalling
Dvent escaping moisture
AI Explanation
The correct answer is D) vent escaping moisture. The holes are poked in the refractory patch on 1 1/2 inch centers to allow any moisture trapped in the refractory material to escape as steam during the heating process. This prevents the buildup of pressure within the patch, which could cause it to spall or crack. The other answer choices are incorrect because they do not directly address the need to vent moisture from the refractory patch.
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