Head Fabrication
Head Fabrication
(OP)
In my company standard, head shall be fabricated from 1 piece. However, the segmental plates may be inevitable for large diameter of vessel.
Please advise me about the additional inspection program for QA/QC during head fabrication.
Please advise me about the additional inspection program for QA/QC during head fabrication.





RE: Head Fabrication
1) NDE (radiography of the weld Seam)
2) WPS/PQR
3) If the client has called for hardness, then check hardness
RE: Head Fabrication
Thanks for your comment. For further understanding, please advise me in the following queries :-
- Should we confirm RT after forming?
- Should we confirm MT/PT after forming?
- What is the acceptable hardness?
In my case, head material is 2.25Cr-1Mo steel. Vessel diameter is 2 to 3 m (hemispherical head).
RE: Head Fabrication
I suggest as follows :
1) RT before forming
2) RT after forming
3) MPI after stress relieving
4) Acceptable heardness for 2.25 Cr-1Mo 225 BHN