My Point wise Reply for your Query is as follows
- The Thickness of your vessels is within the requirements of
UG-84(6mm or 25% of the thickness)
- Practically I think the welding of these three vessels will not be
possible within three month span for all 'A' & 'B' Catagory Joints, if
your production schedule is possible you can go for lesser number of
PTC.
- Eraction at Single site has no advantage the fabrication should be
done at same location for three vessels.
- As the heat number is not same but material specification is same
you can choose the material from any one heat.
- The Seperate PTC requirement will not be due to Long(A) & Circ
Seam(B). The difference will be as per Position and Procedure.
- I assume you will use two procedure one of SMAW & other of SAW
welding.
Final Solution:
1. Select the material of PTC of 70mm thick from any heat, Weld the
same with SMAW in 3G Position it will cover all the positions ( i.e
Long & Circ Seams of Shell, Doller & Pettal Seam of Dish if any)( But
be careful due to high heat input Impact may fail)( Do the welding 3G
only if required otherwise weld in the required position). If the
welding completes within 3 month no need to weld other with manual
otherwise weld one more coupon to cover another three months.
2. Select the PTC of 70 mm thick and weld with SAW welding in the 1G
positon , this will cover for Long & Circ Seams. The same way if
welding required to be covered for next three month weld one more test
coupon.
3. So with Four test coupon you can comply the ASME Section VIII
requirements.
4. Please be care full if there is any Long & Circ Seams in the Nozzle
with different thickness and procedure is different you need to have
PTC for that also.
Hope the things will be clear to you.
Regards
Best Regards,
JASPAL SINGH CWI-AWS, CSWIP-3.1
Head Quality Assurance-ISGEC-PED, Yamunanagar, Haryana (India) PH:
+911732307251 ; Mob. +918930111441(CUG), +919996624244
On Nov 28, 6:35 am, "r.kesav moorthi" <k7moor...@yahoo.co.in> wrote:
> Dear,
> you need all 6 PTC 's to qualify the production weld of LS & CS joints of vessels.
>
>
> 175, R.Kesavamoorthi,
> Principal surveyor,
> Quest (pvt.) Ltd.,
> Ranipet.
>
> From: asad azmi <azmiasada...@gmail.com>
> To: materials-welding@googlegroups.com
> Cc:
> Sent: Friday, 26 November, 2010 4:30:01 PM
> Subject: [MW:8391] production test coupon requiorement as per ASME SEC VIII DIV 1
>
> Dear all,
>
> Greetings.
>
> Please inform me PTC(Production test coupon requirement) for below details--
>
> Construction Code : ASME SEC VIII DIV 1
>
> Shell Material : SA 387 GR 12 CL 2, 65 & 70 Thk.
>
> MDMT : 0 Deg Celcius
>
> Impact test is required as per ASME SEC VIII DIV 1.
>
> The Heat number for shell material for 3 vessels is not same.
>
>
> 3 vessels are required to be fabricated as per the above requirement for single client. The vessels are going to to be erected at one location only.
>
> The thichkness of shell material for 1 vessel is 65 Thk and for other 2 vessels is 70 Thk. Diameter and Length of the vessel is different. Only MDMT and material is same.
>
> Please inform me whether seprate PTC( production test coupon) is required for each vessel OR 1 PTC attached with longseam/Circ. Seam of only 1 vessel will also represent other 2 vessels also.
>
> Whether 2 PTC ( 1 for longseam & 1 for circumferential seam for 1 vessel) is enough for all three vessels OR total of 6 PTC are required for 3 vessels.
>
> Please give code reference.
>
> Thanks in advance for your valuable suggestions.
>
> Regards
>
> Asad Azmi
>
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