Line stopping allows for a valve cut-in while maintaining the existing system flow. The line drawing below shows that the main system line is isolated using a stopping unit, drained and cut. A cut-in valve is then installed. After the cut-in valve is installed, the stopping equipment is removed and a completion plug with a blind flange is installed.


A line stop for relocation uses two hot tap and two line stopping units on high-pressure piping. Line stop plugging machines stop the system flow in the old pipe. The new pipe (system relocation) is in place and the system flow is re-routed. The line stop machines are removed and stop fittings are installed at completion.

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Hot tapping or pressure tapping is the method of making a connection to existing piping or vessels while the existing system is under pressure. This method employs a drilling or tapping machine; a full-ported valve and a pressure-contained fitting attached to the existing pressurized system. Minimal water loss occurs utilizing this process.

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"I have worked in and around this industry for more than 20 years. I have worked with Craig and his team for the last 5 years. They did a hot tap on a 12-inch and 14-inch chilled water riser for was a very smooth operation."

-Craig Wooten,
Chief Engineer, Jones Lang LaSalle
"Working with McCoy Piping Services has always been a positive experience. The McCoy team presents a positive image. Their people are excellent, knowledgeable, on time, and work very well with us."

-Steve Conway,
C.E. Associate II, City Of Columbus
"McCoy Piping Services is the only company we work with to cut waterline taps. The services they provide are very specialized and require a lot of knowledge and skill. They are reliable to schedule and do a professional job."

-Jack Foster,
Geotex Construction Services
McCoy Piping Services
425 Hosack Street P.O. Box 07803
Columbus, OH 43207
(614) 444 - 2622