ASME – Lessens Learned :
Sample of Design Data on GA Drawing
Part 1 of 4 - Postweld Heat Treatment Rev.3
APAVE TIV (Thailand) Co., Ltd.
Chutchai Phromngam
Chutchai.phromngam@apave.co.th
Aug 2024
ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1-Postweld Heat Treatment.
Section VIII.1
ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1 of 4 - Postweld Heat Treatment
Case 1
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When, PWHT specified “NO”.
“POST WELD HEAT TREATMENT
:
NO, general notes 7
The minimum information should be describe at “General Notes:” such as…
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ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1-Postweld Heat Treatment.
Case 1
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When, PWHT specified “NO”.
The minimum information should be describe at
“General Notes:” such as
ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1 of 4 - Postweld Heat Treatment
Section VIII.1
1. PWHT exempted as per Table UCS-56-1 General Notes: (b).
Sample :
[Max. nominal thickness,UW-40(f) applicable paragraphs = 6mm
through 25 mm. Vessel mat’l P.No. 1 Gr. 1 and 2 ]
General Notes:
7. PWHT exempted as per Table UCS-56-1 General Notes: (b).
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ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1-Postweld Heat Treatment.
Case 1
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Or other case when vessel performed a preheat is applied.
The minimum information should be describe at
“General Notes:” such as
ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1 of 4 - Postweld Heat Treatment
Section VIII.1
“Preheat shall be apply at minimum of 95°C when nominal thickness
as per UW-40(f) applicable paragraphs more than 32 mm.”
Sample :
[Vessel nominal thickness,UW-40(f) applicable paragraphs = 25 mm
through 35mm. mat’l P.No. 1 Gr. 1 and 2 ]
General Notes:
7. Preheat shall be apply at minimum of 95°C when nominal
thickness as per UW-40(f) applicable paragraphs more than 32
mm.
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ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1-Postweld Heat Treatment.
Section VIII.1
ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1 of 4 - Postweld Heat Treatment
Case 2
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When, PWHT specified “Yes”.
“POST WELD HEAT TREATMENT
:
Yes, (see note 9)
What information describe at “ Note 9:….?”
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ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1-Postweld Heat Treatment.
Case 2
When, PWHT specified “YES”.
Notes:
ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1 of 4 - Postweld Heat Treatment
Section VIII.1
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Question maybe have :
this PWHT performing including tubesheet?
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Section VIII.1
So, when, PWHT specified “YES”.
Case 2
The minimum information should be describe at
“General Notes:” such as
ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1 of 4 - Postweld Heat Treatment
ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1-Postweld Heat Treatment.
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1.Components to be perform PWHT(e.g whole vessel, tube to tubesheet
welded joint only, Nozzle N2 to bottom head welded joint only)
2. Maximum heating rate.
3.Minimum holding time at Nominal holding temperature.
4. Maximum cooling rate.
Sample : [maximum metal thickness = 90 mm. Tubesheet, nominal
thickness,UW-40(f) applicable paragraphs = 2.0 mm tube to
tubesheep welded, mat’l P.No. 1 Gr. 1 to P.No.1 Gr.2 ]
General Notes:
See next page
10. Tube to Tubesheet welded joint with no other components, when
performing PWHT above 425°C maximum heating rate is 55°C/h,
minimum hold time is 60 minute at nominal holding temperature of
600-620°C, and maximum Cooling rate is 70°C/h.
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ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1-Postweld Heat Treatment.
Case 2
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Or other case when vessel performed as a whole PWHT
Sample : [maximum metal thickness = 50 mm. shell and
nominal thickness,UW-40(f) applicable paragraph = 50 mm
shell to shell welded, mat’l P.No. 1 Gr. 1 to P.No.1 Gr.2 ]
ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1 of 4 - Postweld Heat Treatment
Section VIII.1
General Notes:
7. Whole vessel when performing PWHT above 425°C
maximum heating rate is 110°C/h, minimum hold time is 120
minute at nominal holding temperature of 600-620°C, and
maximum Cooling rate is 135°C/h.
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ASME – Lessens Learned : Sample of Design Data on GA Drawing Part 1 of 4 - Postweld Heat Treatment
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