What is a elastic bend in long-run pipeline?

[onrush]

Dear members,

In my current project, there is a 3" pygas pipeline with its length 2Km. However, our client requests us to use elastic bend for change of direction wherever possible.

My questions are;

1) What is a elastic bend and how is it installed at site?

2) Why should a elastic bend be used?
(I think that factory-made 5D bend may be sufficient
for pigging.)

3) Where can I get any technical information about elastic
bend? (Website may be better.)

4) How can I determine the minimum bending radius of a
elastic bend under given conditions?

Thanks....

 

[JStephen]

Well, I'm not a pipe person, but sounds like they just want the pipe deflected without putting any fittings in it. Check your pipe code and see if it specifies a minimum radius or maximum bending stress that is permissible.