Question 226Steam Plants - Assistant Engineer70% to pass
To prevent a small plastic refractory wall patch repair from falling into the furnace of a D-type boiler, you should _______________.
AI Explanation
The correct answer is D) undercut the existing brick around the area to be patched.
The reason this is the correct answer is that undercutting the existing brick around the area to be patched helps to create a secure, interlocking fit for the plastic refractory wall patch. This prevents the patch from falling into the furnace of the D-type boiler. Undercutting the brick provides a mechanical attachment for the patch, rather than relying solely on the adhesive properties of the plastic material.
The other answer choices are not as effective for securing the patch. Mixing the plastic with concrete may not provide a strong enough bond, reinforcing with metal mesh could be difficult in the confined boiler space, and attaching anchor bolts to the furnace casing would not create the necessary interlocking fit with the existing brick.
Related Questions
#224 To make temporary emergency repairs to brickwork in a boiler furnace, which of the materials listed should be used? #225 Radial cracks have developed in the castable refractory of the burner cones after the first firing since the installation of new furnace front refractory. This is an indication of _______________.#227 Which of the following conditions is indicated by an external bulge or bowed area of the boiler furnace wall? #228 Which of the following problems can occur when an excessive number of water screen tubes are plugged? #229 Slag buildup on boiler furnace refractory is undesirable because it causes _______________.