Post Weld heat treatment & No of thermocouples regarding

[Eswaran samikannu]

Good day to all,

 

We are one of the authorised repairing & Manufacturer  of OEM Cameron, VG & Shaffer BOP and riser pipes , I want to know thermocouples location / No of thermocouples vs Pipe size according to API 6A /API 16A for localaised stress relief (PWHT), Any one have the standards let me know or inform where i can get the information.

 

Thanks

S.Eswaran 

[Lakshman Kumar.B]

Hi,

 

As per API 6A, it was clearly specified PWHT shall be as per WPS only,

 

PWHT shall be carried as per the written procedure(which shall specify the tolerance in the temperature also) by the manufacturer and complying to the WPS.

 

Further WPS shall be in accordance with ASME Sec IX.

So as per my view we can refer for ASME Sec VIII Div -1 UW 40,( For requirements) and UCS 56, UNF 56, UHT 56, UHA 56, (for the temperature range, thickness limits, soaking time, etc)

 

I hope we can follow ASME Sec VIII.

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[Manivannan Hemu]

Hi,

For localized PWHT  the procedure given in AWS D 10.10. This might be used if API 6A/16A permits.

 

Manivannan.

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[K.Babu]

Hi

 

We need to refer client spec for this job.

 

VG, Cameron got their own spec for PWHT.

 

 

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Thanks & regards,

K.Babu

[pgoswami]

Hi Eswaran,

 

These two are the important among the applicable clauses for local PWHT. As stated here and as required a as a part of the quality documentations a PWHT procedure is required.It should include as a minimum requirement the following:-

1. mode of heating   
2. ramp rates(both heating and cooling)
3. recommended PWHT time and temperature, Item 1,2,3 should be as per the design code
4. no of  thermocouples required, location, width of the heating band etc(one may follow AWS D-10.10) as a default standard.

If the client has a written procedure , one should follow that. In case of  a  technical conflict , AWS D-10.10 may also  be referred.

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist & Consultant

Ontario, Canada.

Email-p...@sympatico.ca,

pgos...@quickclic.net

 

6.3.3.4 Post-weld heat treatment — Local heating

Local post-weld heat treatment shall consist of heating a circumferential band around the weld at a temperature within the range specified in the qualified WPS. The minimum width of the controlled band at each side of the weld on the face of the greatest weld width shall be the thickness of the weld or 50 mm (2 in) from the weld edge, whichever is less. Heating by direct flame impingement on the material shall not be permitted.

6.3.2.6 Post-weld heat treatment

Post-weld heat treatment shall be in accordance with the applicable qualified WPS. Welds may be locally post-weld heat-treated. The manufacturer shall specify procedures for the use of local postweld heat treatment.

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of K.Babu
Sent: Friday, March 02, 2012 9:07 AM
To: material...@googlegroups.com
Subject: Re: [MW:13808] Post Weld heat treatment & No of thermocouples regarding

[Vino Varghese]

Dear Sir,

 

The PWHT Temp range is different in ASME B31.3(Table 331.1.1) and ASME Sec VIII Div 1(Table UCS 56), but both are from ASME. The welding and welder qualification are as per ASME Sec IX, for both B31.3 and Sec VIII, Div 1.

 

Why ASME Committee put such a different requirement although both are published from ASME and material grouping is also same, means the metallurgical properties should be same. What should be the criteria of PWHT for PQR run on a Pressure Vessel?

 

Looking forward for a technical clarification.

 

Thanks & Regards

Vino-Doha

 

_________________________________________________________________________________________________________

[Eswaran samikannu]

Good Day to you,

 

Thanks Mr.Lakshman Kumar & Mr.Hemu Manivannan,  I also same point of view in  heating ,cooling & Soaking time and temperature we can follow ASME Codes.Now my concern is number of thermocouples to be connected to each joint and location of thermocouples to monitor the joint temperature. Any refrence / Recomendation from ASME Codes / API Codes.Other than AWS Codes.

 

Thanks

Regards

S.Eswaran 

From: Lakshman Kumar.B <lakshma...@gmail.com>
To: material...@googlegroups.com
Sent: Friday, 2 March 2012 4:58 PM
Subject: [MW:13806] RE: 13803] Post Weld heat treatment & No of thermocouples regarding

[SOHAIB GHNAIMAT]

Gents,   We have an issue with the steel plate manufacturer that he is getting the Raw material in the form of steel slabs from other country, and he is doing the Pre-heating and rolling....etc for the Steel slabs to get the final required steel plates.   Do we require having a mill test certificate for the steel slabs, or is enough to have it for the final steel plates.   The supplier is telling that for the steel slabs all information is secret! Do we need to have the manufacturing process, inspection & test plan for the steel slabs.   He has issued the Inspection & test plan for the processing of steel slabs to final steel plates.   Please advice.   Sohaib

[Clubb, Archie]

If it is a “Secret” then walk away!

 

A

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[Jorge Mejía Lema]

There is no secret they have to show you the real especification by test or by Mill test Report Certificate from the mill. Your paying. Please see API 650 Standard.
Regards

jml from Colombia

2012/3/3 SOHAIB GHNAIMAT <sohaib...@yahoo.com>

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[Kavin Murugam]

1. Thermocouple shall be fitted directly to the equipment to ensure that all portions are properly and uniformly heat-treated without the presence of detrimental thermal gradients.

2.Thermocouples shall be firmly attached to the vessel at a maximum of 4.6 meter intervals in both longitudinal and circumferential directions.   

3.Thermocouples shall be evenly spread on the vessel external surface, including top, bottom, sides and heads; also the additional thermocouples shall be located at any major change in wall thickness.

Thermocouples shall be made from nickel-chromium/nickel aluminium wire to BS 1041, Part IV or equivalent. Certification shall be made available for each reel of wire utilized and shall indicate a tolerance of less than ± 0.5% throughout the temperature range 400ºC to 800ºC.

 

Kavin Murugam

[Fraser Rock]

Sohaib
     I would be very suspect in this situation.  There should be nothing secret about the content of steel plate being used. 
At the end of the day, you are paying for the ploate, you should know exactly what you are paying to receive.
 
Doc...Rockweld
 

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Date: Sat, 3 Mar 2012 13:23:50 -0500
Subject: Re: [MW:13816] Storage Tanks Steel Plates
From: jmeji...@gmail.com
To: material...@googlegroups.com

[Summer-BEBON-Steel]

Dear Sohaib:

 Hi,This is Summer from China, in our steel mills, there is not any secret,please do require for the mill test certificate, if they can not provide that, that means the goods maybe not the exact steel grades you want, be careful about this, 

In our steel mills, each batch of goods have their mill test certificates and certificates of origin issued by the local government, please be noted,'

2012/3/4 Fraser Rock <rock...@live.ca>

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Summer Song 

Sales Maneger 

HENAN BEBON INTERNATIONAL CO., LTD

T: +86-371-86151527                             F: +86-371-86011881 

Mobile: +86-13783594495

E-mail:   bebon...@bebonchina.com   

Web:      www.bebonchina.com

                www.steel-plate-sheet.com

                www.shipbuilding-steel.com

SKYPE:  bebonsummer 

MSN:      bebon...@hotmail.com

Lowest Price--Fast Delivery --Best Quality

[james gerald]

I suppose the Final product Mill certificate giving details of Chemical and mechanical properties as per the applicable material specification mentioning the process route is sufficient.

 

Thanks & Regards

J.Gerald Jayakumar
0091-9344954677

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From: SOHAIB GHNAIMAT <sohaib...@yahoo.com>
To: material...@googlegroups.com
Sent: Saturday, March 3, 2012 5:37 PM

Subject: [MW:13813] Storage Tanks Steel Plates

[Tarantula Ghosh]

My dear good men,
Why fuss over this when all Sohaib has to do is get the plates tested at his end and be done with. Simple, for even if the supplier gives the MTC how much forward can you go to accept the same?  And may be it is true, he does not want to divulge the info about where he gets his slabs from. So, I would suggest just get the "final steel plates" tested to your requirements. And see if you can back charge the supplier. Depends on what your purchase agreements were.No big deal as I see.
Thanks,
TG

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Tarantula

[manohar tikle]

I feel there is slight doubt in the mind of the person who is accepting the material. I suggest a sampling inspection for following tests

1. Full Plate Ultrsound scan A type for acceptance to SA 578 cl II or better in case of laminations, tears, any other rolling defects. Also additional tests for gas inclusions and for size variations in plate supplied to user of plates. slabs are good - so will plates be good provided the rolling of slabs is as per standards

Manish Tikle
Shritara Engineers
& Project Consultants,
61/62, Unique Tower,
4, Padma Nagar,
Off Link Road,
Malad(W),Mumbai
Pin 400 064.
Telfax:+91 22 28813803.
e mail:shri...@rediffmail.com

From: Tarantula Ghosh <ghosh.t...@gmail.com>
Sent: Mon, 05 Mar 2012 13:06:35
To: material...@googlegroups.com

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