Eduardo1982
Mechanical
- Oct 31, 2014
- 65
Hey guys I hope ervtybody here is fine.
I wish to know yuor ideas in regards of the next topic. As it is stipulated in several docs and codes PWHT and NDT must be done before of any test pressure on lines. In many systems, like steam lines to turbines or boilers, the chemical cleaning and steam blowing Will be done after test pressure. However, as normal practises, some valves are installed after chemical cleaning & steam blowing process and welding Works (with NDT & PWHT) must be performed as "Golden joints". The point is that.. what could be the risk if instead to perform NDT & PWHT on time before of hydrotest, I decide to perform some PWHT & NDT after chemical cleaning? If I believe that my welders are skyll enough so probably I won´t have any problem with the soundness of the welds…. or is there any problem related to mechanical properties on the pipe that I could see only with hydrotest?
I wish to know yuor ideas in regards of the next topic. As it is stipulated in several docs and codes PWHT and NDT must be done before of any test pressure on lines. In many systems, like steam lines to turbines or boilers, the chemical cleaning and steam blowing Will be done after test pressure. However, as normal practises, some valves are installed after chemical cleaning & steam blowing process and welding Works (with NDT & PWHT) must be performed as "Golden joints". The point is that.. what could be the risk if instead to perform NDT & PWHT on time before of hydrotest, I decide to perform some PWHT & NDT after chemical cleaning? If I believe that my welders are skyll enough so probably I won´t have any problem with the soundness of the welds…. or is there any problem related to mechanical properties on the pipe that I could see only with hydrotest?
