Hi Vino
PWHT is Reqd for the below reasons.
-// We tried to convince Client stating that this requirement of PWHT is not required as per ASME B 31.3 as this is not a Pressure Component(U-1(c)(2)(e), ASME Sec VIII, Div 1) //
Refer U-1(d). from the interpretation of the clause; any vessel/part can be designed to ASME Sec VIII and still can be stamped. This requirement is generally dictated by Client. It is the Client responsibility to dictate the service requirements. Here client has specified you the service as “Lethal” (refer U-2)
Refer UW-2 Service restrictions (excerpt)
…. If determined as lethal, the user and / or his designated agent [see U-2(a)] shall so advise the designer and / or manufacturer. It shall be the responsibility of the manufacturer to comply with the applicable Code provisions (see UCI-2 and UCD-2)
// only the Calculation part of MIXER has been considered in accordance to ASME Sec VIII, Div 1.//
The design Calculations derived from UG and as well as applicable UW for design calculations such as applicable joint type, Joint efficiency, requirement of NDT based on joint efficiency. (refer UG-16)
Extract from B 31.3
My Conclusion
The owner might have selected Category M fluid design requirements here, but specifically he selected ASME Sec VIII, Div.1 for the valid reasons he may have.
Moreover, the term “Lethal” is not addressed any where in the B 31.3 Code but it is very well addressed in ASME Sec VIII. So, the client very much aware of his design and related construction requirements. So as per my preseceptive, the item requires PWHT.
Othere seniors may throw some light
BR
M.Vijayan
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Vino Varghese
Sent: Thursday, December 22, 2011 11:12 PM
To: materials-welding@googlegroups.com
Subject: [MW:13271] Technical Query for MIXER / ASME B 31.3 Vs ASME Sec VIII Div 1
Dear Experts,
We have a Piping Component(Thickness 9.5mm), named MIXER(Sour Service & Lethal) which is coming in line with Pipeline.
1. The Data Sheet of this Mixer refers to Calculation part as per ASME Sec VIII, Div 1 , 2010 Ed.
2. The fabrication, inspection, testing refers to ASME B 31.3.
Query: Client is requesting to do Post Weld Heat Treatment for all the Weld joints as service is Lethal(UW-2 of ASME Sec VIII, Div 1 ).
We tried to convince Client stating that this requirement of PWHT is not required as per ASME B 31.3 as this is not a Pressure Component(U-1(c)(2)(e), ASME Sec VIII, Div 1) and moreover, only the Calculation part of MIXER has been considered in accordance to ASME Sec VIII, Div 1.
Client still insisit for PWHT of all related weld joints as the Process stream of this mixer has been considered "LETHAL", hence it is applicable to MIXER too. The MIXER is completed, painted and recieved at our end from Supplier without PWHT.
Please provide your technical support to justify the Query and what further appropriate action can be considered.
Thanks & Regards
Vino P Varghese
Doha- Qatar
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at 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 w.r.t. applicable code/standard/contract documents.
This communication and any files transmitted with it are confidential and may also be privileged. It is for the exclusive use of the intended recipient(s). If you are not the intended recipient or the person responsible for delivering it to the intended recipient(s), please note that any form of distribution, copying or use of this communication or information contained in it is strictly prohibited and may be unlawful. If you have received this communication in error please return it to the sender, and delete the material from any computer. We reserve the right to monitor email communications through normal internal and external networks. We believe but not warrant that the email and the attachments are virus free. The statement and opinions expressed in this communication are those of the writer and do not necessarily represent those of Madina Group, whose registered office address is
P.O. Box 20459, Doha, Qatar.
Tel. +974 44600818
Fax. +974 44603143
No comments:
Post a Comment