To align a flange with 8 bolt holes, which type of hole must be performed?

When aligning a flange with 8 bolt holes, performing a type 2 hole is essential. This type of hole is specifically designed to allow for adequate alignment of the flange’s holes, ensuring that the bolts can be inserted easily without causing misalignment or stressing the flanges.

The type 2 hole provides proper clearance and tolerances necessary for an 8-bolt configuration, accommodating minor variations in bolt hole spacing that may occur during fabrication or installation. This facilitates the proper seating of the flange, ensuring a good seal and preventing leaks in the piping system.

The other types of holes may not provide the necessary features to align multiple bolt holes effectively, which is crucial in maintaining the integrity of the connection between the flanges and the overall piping system. Therefore, utilizing a type 2 hole is the best practice for achieving the required alignment in this scenario.