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A workover rig. The term workover is used to refer to any kind of oil well intervention involving invasive techniques, such as wireline, coiled tubing or snubbing. More specifically though, it will refer to the expensive process of pulling and replacing a completion.
Be advised, an energy recovery wheel purge section is a feature that will reduce carryover leakage. It will not guarantee zero leakage from the exhaust side to the supply side of the unit. Energy Recovery Wheels | Understanding Cross Contamination / Leakage. Also, do not use a purge section on every unit. If you are not concerned with carryover then donât use a purge (like in a typical school application).