6/11/2023 0 Comments Hot to avoid dead legs in pipe![]() ![]() The cutter is withdrawn with the trepanned piece of pipe wall and the valve is closed. A cutting machine is attached to the valve, the latter is then opened, and the cutter is moved forward through the valve and trepans a hole in the side of the pipe. A split collar is clamped on to the main, the collar having a flanged branch on it to which is bolted a gate valve. If a double-socketed tee is used this must be inserted using a plain piece of pipe on one side, again joined by a collar to the pipeline.Īn alternative is to use an under-pressure connection as shown in Figure 16.2. The socket of the tee is pushed up to fit one end of the cut pipe and the resulting gap between the two spigots at the other end is joined by using a collar. If a socket and spigot tee has to be inserted into an existing pipeline the length cut out of the latter must be slightly greater than the overall length of the tee. Ratnayaka BSc, DIC, MSc, FIChemE, FCIWEM, in Twort's Water Supply (Seventh Edition), 2017 17.39 Making Connections
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