RiyadhBPV
Mechanical
- Mar 22, 2024
- 1
Dear all,
A pressure vessel to be designed acc. to the following conditions:
- Design Pressure: 600 psig
- Max Design Temperature: 240 F
- Min Design Temperature: 32 F
- Internal Diameter: 144 in
- Corrosion Allowance: 0.125 in
- Material: SA 516 Gr. 70
- Design Code: ASME BPV, SEC. VIII DIV 1
I select 2.375 in thickness for the elliptical head (After Forming) to satisfy internal pressure design.
Now:
- To satisfy MDT the material shall be Normalized.
- As per UCS-56, Table UCS-56-1 & since the welded joints over 1 1/2 in nominal thickness, PWHT is MANDATORY.
- As per UG-79, The calculated extreme fiber elongation percent exceeds 5%
- As per UCS-79 and since extreme fiber elongation percent exceeds 5%, the head shall be Post Forming Heat Treated (PFHT)
My question is:
Is it practical to apply 3 stages of heat treatment (Normalizing, PFHT and PWHT) for my pressure part?
Thank you all from heart
A pressure vessel to be designed acc. to the following conditions:
- Design Pressure: 600 psig
- Max Design Temperature: 240 F
- Min Design Temperature: 32 F
- Internal Diameter: 144 in
- Corrosion Allowance: 0.125 in
- Material: SA 516 Gr. 70
- Design Code: ASME BPV, SEC. VIII DIV 1
I select 2.375 in thickness for the elliptical head (After Forming) to satisfy internal pressure design.
Now:
- To satisfy MDT the material shall be Normalized.
- As per UCS-56, Table UCS-56-1 & since the welded joints over 1 1/2 in nominal thickness, PWHT is MANDATORY.
- As per UG-79, The calculated extreme fiber elongation percent exceeds 5%
- As per UCS-79 and since extreme fiber elongation percent exceeds 5%, the head shall be Post Forming Heat Treated (PFHT)
My question is:
Is it practical to apply 3 stages of heat treatment (Normalizing, PFHT and PWHT) for my pressure part?
Thank you all from heart