Hello,
I would like to get some information about pipe roll (rotation of the pipeline when installed subsea) and the ways to prevent it when installing tees or valves.
Well this is a phenomenon which happened as the pipeline tries to minimise the work done due to the reverse bending at the sag bend.This cases problems when installing valves and tees as it change the orientation
But those are for the connection, not trying to control it during laying. I think that's what S0606 is aftera. I don't know if anyone is trying to control it during laying, except by holding tension and not letting it overbend too much.
I've always included a misalignment fitting "ball-socket type" in my tie-ins. It accepts a few degrees angular misalignment and rotates to any angle to match flange bolt holes, but that's for tie-ins, not during laying.
Thanks for you comment but what I am looking for is controlling during the laying process not at the tie-in. Actually, there are ways to do this such as attaching a bouncy tanks to valves to stop it roll and stay in the right direction.
I am looking for more information on the subject of rectifying this problem
Isn't it easier to lay the pipes, then come back, and lower in and connect tie-in assemblies? We never did a layoff with a valve rolling down a stinger and that was in what I'm sure must have been much shallower water than is typical these days.