An existing, buried, empty, 2-inch GRS conduit is to be used for a new application. One end stub-up remains as is, the other end will be relocated. The idea is to remove a portion of the conduit and replace it with a new portion that is routed to the new location.
What type of conduit connection would you recommend?
Could the existing conduit be threaded in place in the trench?
What method could be used to cut and thread it without removing it from the trench?
A word of warning. I have had the threads on the next coupling back strip and break threading in place. If possable I would look for a joint to cut. Otherwise I would have a helper hold the pipe from spinning. Rod
Re: How can GRS be threaded when buried?#72313 11/22/0607:53 PM11/22/0607:53 PM
If you cant get/rent a threader like that, shoot for the ole' skool method and get a regular racheting die, and put your back into it.... (Or someone elses back) 3 forward - 2 back after you get it started, and use plenty of fluid.
Or if using a compression fitting - go for stainless tape tight with 20 mil, and if you really feel like you're cheating and your not.... Pour a little form of concrete. As for getting it tight enough - a trick I learned right here at ECN from Electure is to use a hammer drill with a chisle bit to work the edges of the fitting into getting tighter than possible with a wrench.
Mark Heller "Well - I oughta....." -Jackie Gleason
Re: How can GRS be threaded when buried?#72314 11/22/0609:04 PM11/22/0609:04 PM
iwire has the ticket, I thread pipe in the ground all the time with 700. 3 piece coupling and you're good to go. I wouldn't trust 3/4 pipe to hold a 700 back though, if the pipe breaks and it will on the thread the 700 might rip you a new one. If I couldn't hold it, I'd slip a piece of 2" over the handle. Definitely hold the pipe you are threading with a wrench so as not to spin it. Livetoride is correct, you can break it at the next coupling.
Re: How can GRS be threaded when buried?#72315 11/22/0609:11 PM11/22/0609:11 PM