Quote Originally Posted by FATHI View Post
There is a dedicated and clear chapter about bolt torque, bolt pretension load with or without bolt greasing , with wrench or controlled tightening in this standard
API 6A

I believe it is a standard about Christmas trees for oil industry

Unfortunately I do not have a copy here , but I am wiling to talk in detail if I find it.

if someons has this standard please upload it , than we can talk further
API 6D Pipeline Valves - 2002:

[link Point to another website Only the registered members can access]