Hello Ibrahim,
The following clarification may help you.
QW-202(F) Multiple PQRs With One WPS.
A single WPS may cover several essential variable changes as long as a supporting PQR exists for each essential and, when required, supplementary essential variable
· [e.g., a single WPS may cover a thickness range from 1⁄16 in. (1.5 mm) through 11⁄4 in. (32 mm) if PQRs exist for both the 1⁄16 in. (1.5 mm) through 3⁄16 in. (5 mm) and 3⁄16 in. (5 mm) through 11⁄4 in. (32 mm) thickness ranges].
As per the query posed by Mr Ibrahim
Shell Material : SA 516 Gr.70 -- 50 mm Thk
Nozzle : SA 333 Gr.6 --- 7 mm thk
MDMT : - 46 Deg.C
I need to weld the nozzle to shell. I have a PQR with SMAW process qualified in 40 mm thk and another PQR with SMAW qualified in 6 mm thk.
As per Sec. IX if impact test is required the 40 mm PQR will support from 16 mm to 200 mm. base metal Thk. and the other PQR will support from 6 mm to 12 mm thk.
- If I club these PQR can I write a WPS to support 6 mm to 200 mm?. No the qualification range of 12-16 mm is missing . You would require a PQR to support this range ,preferably to be done on 8 or 10 mm thick plate
- Is there any issue for the missing range of qualification between 12 mm to 16 mm?. – Yes ASME Sec-IX , requirements are not fulfilled. If your organization holds any ASME stamp, you need to ensure that you do not deviate from ASME Codes it may be an issue during any quality audit.
- Or is it required to add another PQR to fill the missing thickness range from 12 to 16 mm between the first two PQRs?.—Yes, as explained above.
Date: Thu, 8 Apr 2010 07:59:50 +0400
Subject: Re: [MW:4748] Multiple PQRs for Impact test requirement
From: romiomdabre@gmail.com
To: materials-welding@googlegroups.com
Can anybody give more clear information on this combination as its contradictory to the code qualification range.
When we will make the WPS with combination of PQR from 6.0mm to 200.0mm it means u can weld even 13.0/14.0/15.0 mm base metal but you do not have any qualified PQR to support for this range (When impact is required only)
On Wed, Apr 7, 2010 at 7:59 PM, Muhammed Ibrahim <ibratech@gmail.com> wrote:
Dear Sir,
As per the below statement QW 401.3 & ASME Interpretations IX-04-04 the base metal will support from 6 to 200?.
"When essential variables are qualified by one or more
PQRs and supplementary essential variables are qualified
by other PQRs, the ranges of essential variables established
by the former PQRs are only affected by the latter to the
extent specified in the applicable supplementary essential
variable (e.g., essential variable QW-403.8 governs the
minimum and maximum thickness of base metal qualified.
When supplementary essential variable QW-403.6 applies,
it modifies only the minimum thickness qualified, not the
maximum)."
On 6 April 2010 11:25, <george.dilintas@gr.bureauveritas.com> wrote:
Hi,
Regarding individual (SMAW and GTAW) T limits what are you saying complies with QW-403.6, but you can not club those two PQRs and lower the T limit.
T is not the deposited weld metal thickness but the global (total) thickness.
I think in case you want to have a qualified WPS valid from 6 to 200 mm this is not possible when impact test is required.
UCS 67 does not give any exemption related to the type of the weld (A or B or D...) and the production impact test (UG084(i)) is not to be confused with the
WPS qualification
Dr. G. Dilintas
I&F Regional Technical Manager
Bureau Veritas Piraeus - Greece
Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
Error! Filename not specified.Muhammed Ibrahim <ibratech@gmail.com>
| Muhammed Ibrahim <ibratech@gmail.com> Sent by: materials-welding@googlegroups.com 31/03/2010 17:26
|
|
Hi Members,
Please provide a solution for the following issue.
Shell Material : SA 516 Gr.70 -- 50 mm Thk
Nozzle : SA 333 Gr.6 --- 7 mm thk
MDMT : - 46 Deg.C
I need to weld the nozzle to shell. I have a PQR with SMAW process qualified in 40 mm thk and another PQR with SMAW qualified in 6 mm thk.
As per Sec. IX if impact test is required the 40 mm PQR will support from 16 mm to 200 mm. base metal Thk. and the other PQR will support from 6 mm to 12 mm thk.
If I club these PQR can I write a WPS to support 6 mm to 200 mm?.
Is there any issue for the missing range of qualification between 12 mm to 16 mm?.
Or is it required to add another PQR to fill the missing thickness range from 12 to 16 mm between the first two PQRs?.
Or can I write a WPS directly with range 5mm to 200mm omitting impact test requirement for this joint as it is a category D joint and exempted from Production Test Coupon?.
Thanks & Regards
Muhammed Ibrahim PK
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Thanks & Regards
Muhammed Ibrahim PK
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