watermain: cut in vs. pressure connection
watermain: cut in vs. pressure connection
(OP)
generally, what's the difference between a cut-in and pressure connetion. is a valve vault typically required for a cut-in connection (VV is typically required for a PC). also, how do you typically call out a cut-in (simply "proposed cut-in connection")?





RE: watermain: cut in vs. pressure connection
I believe it was a plastic or rubber tapping sleeve that was attached to the main line. It gets foggy here but I believe a short stub-out was connected to the tee with valve attached. I can't remember exactly how the tee\stub-out was attaced to the sleeve but probably a mechanical joint\gasket.
Then a tapping machine is attached water tight to the valve with a mechanical joint. The one I saw was semi manual in that its moving bit had to be physically turned into the wet pipe to make the cut. Once the pipe had been penetrated the tapping machine bit is backed to the machine and the valve is shut. It then is safe to disconnect the machine.
Then you just pour a kicker behind the wet tap like it was a normal tee. My experience was with 8 and 6 in line I think. I imagine it could be a bit different with larger pipe.
RE: watermain: cut in vs. pressure connection
RE: watermain: cut in vs. pressure connection
A "cut in connection" requires shutting down the line being tapped. This is usually undesirable but sometimes necessary.
If you can't find a catalog many of AWWA's publications illustrate both procedures. For example, their Water Distribution Operator Training Handbook is an excellent source of practical information.
As to whether or not a vault is required, this is a function of how large the valve is and what type of valve it is. Consult the water system operator you are working with to find out their policy.
Good luck
RE: watermain: cut in vs. pressure connection
RE: watermain: cut in vs. pressure connection
RE: watermain: cut in vs. pressure connection
A cut in valve could be used to install an in-line shutoff valve on the main. It could also be used where a full size tee or cross needs to be installed in the mainline or where a the main / tee is very large.
If you are going to shut down the main, any type of valve or fitting could be installed.
By "valve vault" do you mean the enclosure for the valve operating stem? (Valve Box) Or an actual concrete structure for access to the valve? You will need one or the other regardless of which type valve you use.
RE: watermain: cut in vs. pressure connection
RE: watermain: cut in vs. pressure connection