The prefabricated components of a flanges system are classified as spool flanges. They are mounted during the fabrication before they are delivered to the construction area.

Spool flange is a short segment of piping fitting this is usually intended to be removed, either for service or as a stand-in for a valve or other fixture to be installed at a later date.The usual attachment is made with a pipe section fitted with bolted flanges that are built pre-aligned.

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