The correct answer is D) Each bolt should be installed and tightened in consecutive order in the clockwise direction. The reasoning behind this is that tightening the bolts in a clockwise pattern helps to evenly distribute the clamping force around the flange, ensuring a tight and uniform seal. This process is commonly referred to as "star tightening" or "crisscross tightening" and is recommended by most equipment manufacturers and industry best practices. The other options are incorrect because option A) tightening in opposite pairs can lead to uneven clamping, while options B) and C) do not follow the recommended clockwise tightening pattern.