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When moving tubing into and out of a pressurized well, slips are used to hold onto the pipe. The modern HCU systems have 4 sets of slips: two sets of snubbing slips control pipe during pipe light operations and two sets of heavy slips control pipe during pipe heavy operations. Once the slips bite the pipe, a hydraulic jack is used to move the pipe into or out of the well. The process is relatively fast and consists of one set of slips biting the pipe, the other set opening, the jack moving the pipe about 10 ft, then the other slips grab the pipe again. Snubbing units are able to move pipe into and out of the well without any pressurized fluid escaping. This process is called [[Glossary:Stripping|stripping]], which is the act of moving pipe through a closed annular blow out preventer. (Note: when working with wellhead pressures in excess of 3,000 psi, can test the efficient operating limitations of most coiled tubing units.) When working with surface pressure greater than 3,000 psi, all pipe connections must be “staged” into or out of the well in a process called ram to ram staging. An equalizing valve and a bleed-off valve are used to safely move the tubing and couplings through the BOP. The final set of safety devices are the profile nipples installed periodically throughout the tubing string. In the event of a check valve or tubing failure, wireline plugs can be run to isolate the problem<ref>Reference one paper SPE-123123-MS</ref>.<br />
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