Question 616Steam Plants - Assistant Engineer

The correct answer is C) inject sealing compound between the casing halves. Turbine casing flanges are sometimes provided with a system of joint grooving to allow for the injection of a sealing compound between the casing halves. This helps create a tight seal and prevent leakage from the casing. The other options are incorrect because they do not directly address the purpose of the joint grooving feature. Option A describes a labyrinth seal, which is a different sealing mechanism. Option B refers to increasing contact pressure, which is not the primary function of the joint grooving. Option D is about ensuring alignment, which is a separate consideration from sealing.