ASME B-31.1, specifies that uniform ,preheat, post heating(when specified by design specifications) and PWHT (when specified by design code), needs to be done for power piping. Performing the above with resistance coils(local PWHT) are common practice for in situ fabricated piping.
Please look at AWS-D-10.10-2009, for detailed guidance.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist
Hamilton, Ontario, Canada
ca.LinkedIn.com/pub/pradip-goswami/5/985/299
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of george.dilintas@gr.bureauveritas.com
Sent: Thursday, August 20, 2015 4:02 AM
To: pradip kumar Sil
Subject: Re: [MW:23317] Pre-heat & pre heat maintenance
The preheat method is not specified in the ASME Code. It is a matter of sound engineering practice
Sent from my BlackBerry 10 smartphone.
| From: pradip kumar Sil Sent: Πέμπτη, 20 Αυγούστου 2015 - 10:29 To: materials-welding Reply To: materials-welding@googlegroups.com Subject: [MW:23316] Pre-heat & pre heat maintenance |
Dear All,
-- Is there any code requirement for ASTM A335 Gr P-22 material before welding & pre heat maintenance by resistance coil ( For uniform pre-heating pre heat maintenance ) for power piping
Regards
Pradip
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