Question 441Steam Plants - Assistant Engineer

You are correct, the answer is B) expansion joints. Expansion joints are installed in brickwork on boilers to allow for the thermal expansion of the brickwork when heated. This prevents the brickwork from buckling or cracking due to the expansion. The other options are incorrect: A) Sliding saddles are not used to prevent brickwork from buckling, they are used to support the boiler. C) Insulating bricks do not allow for expansion, they simply provide insulation. D) Insulating blocks, like insulating bricks, provide insulation but do not accommodate thermal expansion.