Pipe Work (surface pipe connections)

May be threaded, unions, clamps, or flanged. Flanged connections are preferable (not mandatory) especially in the higher pressure applications, unions and clamps are acceptable in low to medium pressure, functions, threaded connections are appropriate in low pressure operations only and care must be taken to avoid galling / thread damage.

Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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