A pipe “flange” is a ring of metal, usually welded to the end of a pipe, with holes drilled in it parallel to
the pipe centerline to accept several bolts:
Flange joints are made pressure-tight by inserting a donut-shaped gasket between the flange pairs
prior to tightening the bolts. A common method of installing such a flange gasket is to first install
only half of the bolts (in the holes lower than the centerline of the pipe), drop the gasket between
the flanges, then insert the rest of the bolts:
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