Repair of Body cracks for A 217 Gr WC6
Vinod Jotwani
We have noticed multiple crack during the replica check in the control valve body ( Material A 217 Gr WC6 , size 2 " X 2500 RTJ, H2 service) during the fire incident at our Hydrocracker plant. We would like to carry out the repair jobs for the same,
Kindly share your experience and also advise whether advisable or not. Also share the WPS and cautions to be followed if repair performed by anyone in the group.
Vinod
Muni Andy
It can be welded.But you have to dismantle the valve.
Do preheat as per A217,Weld it and then do Post weld heatreatment
at 700 Deg C.Soaking hours as per thickness.
Do the remachining where required because there
may be little distortion.
Do the crack removal by grinding.
Before proceeding grinding,arrest the crack at both ends.
Regards,
C.Muniyandi
Coimbatore
9994765591
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pgoswami
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Muni Andy
Sent: Sunday, January 02, 2011 9:59 PM
To: material...@googlegroups.com
Subject: Re: [MW:9049] Repair of Body cracks for A 217 Gr WC6
Marcelo P. Soriano Qa/Qc Eng'r.
in my opinion and experience theres bo any code telling that repairing
welding of valve body* (casting) because in casting if you have crack
on it and apply heat it will be larger and more cracks will run
through the body, its better to replace it that than compromise the
safety and property.....
thanks,
marcelo soriano
Technip Qc Eng'r
Muni Andy
Marcelo P. Soriano Qa/Qc Eng'r.
Please considered the type of deffect as said by mister vinod that is
(MULTIPLE CRACK) and also consider the type of service and pressure,
specially the SAFETY and involvement of PROPERTY..
Material A 217 Gr WC6 , size 2 " X 2500 RTJ, H2 service
marcelo p soriano
technip qc eng'r
> >http://materials-welding.blogspot.com/
> > The views expressed/exchnaged in this group are members personel views and
> > meant for educational purposes only, Users must take their own decisions
>
> - Show quoted text -
Vijai Kumar Joshi
Dear Sir,
Please tell the name of electrode to be used.
Thanks and regards.
VKJ
From:
material...@googlegroups.com [mailto:material...@googlegroups.com] On
Behalf Of Muni Andy
Sent: Monday, January 03, 2011 5:59 AM
To: material...@googlegroups.com
Subject: Re: [MW:9049] Repair of Body cracks for A 217 Gr WC6
Dear Vinod,
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Marcelo P. Soriano Qa/Qc Eng'r.
1. need pqr, wps and qualified welder.
2. 2500 rating
3. time for the preparation of documents to be use for repair
4. testing
OR
1. Purchase valve and reinstall and back to operation as early than to
repair MULTIPLE CRACKS on VALVE BODY....
> >http://materials-welding.blogspot.com/
> > The views expressed/exchnaged in this group are members personel views and
> > meant for educational purposes only, Users must take their own decisions
Muni Andy
Thanks for your mail.
I understaood the situation.I am not telling to use as it is..
Take more care.Do repair.Pls ensure that the defect is removed.
Then you can use.
Getting new valve will take months.Also will cost more money.
Everyone cannot do the repair and it is not a easy task.but it is possible.
.Some expert guidance required.
C.Muniyandi
On 1/3/11, Marcelo P. Soriano Qa/Qc Eng'r.
Panomsit Srirunpetch
Vinod Jotwani
Thanks for the valuable suggestions. Looking to the risk involved and the time period required to carry out the repair we have decided to put in a globe valve to control flow temperorily (as process allows for it) and to procure new valve body.
Thanks again,
Vinod
--- On Mon, 1/3/11, Marcelo P. Soriano Qa/Qc Eng'r. <marcelopso...@yahoo.com.ph> wrote:
pgoswami
Vinod,
I would say that was a wise discussion. Although I had dropped a few lines on safe welding practices as per API -510, later after browsing through API-579(Section-11, Assessment of Fire Damage ), I realized that a lot more things are desired for proper assessment for any fire damage , then only any welding/ refurbishing should be thought of.
It would be a good idea to get some heads up from API-579 on such damages in future . There're are some typical examples on assessment of fire damages of various plants and equipments in this API/ASME book.
Thanks.
Pradip
Goswami,P.Eng.,IWE
Welding & Metallurgical Specialist &
Consultant
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sharafat dhanse
this type of weld repair procedure is called as stelliteing.