The purpose of pre-heating is to slow down the cooling rate. so for thickness >25mm you must follow resistance coil method for pre heating to ensure that the full material volume surrounding the joint is heated.
regards,
LALU
On Mon, Aug 24, 2015 at 9:14 AM, Rejoy Thomas <rejoythomas90@gmail.com> wrote:
Dear Sir,Is it OK to preheat the pipe using cooper heating method for high thickness (say >25mm) carbon steel/ alloy steel pipes, like SA335 P22? Root and hot pass will be performed by GTAW & subsequent passes by SAW or FCAW. Is there any restriction in using this type of heating in power piping, where the heating equipment is stationary and the pipe is rotating which might affect the uniform heating?RegardsRejoy ThomasPiping/Welding QC & ExpeditorSTF SpATo view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CALLc27_SiSMKdFLH71wx0Jq0sT9inr%3DHUdGZqUbPR3bCFgsWSQ%40mail.gmail.com.--On 20 August 2015 at 14:43, pgoswami <pgoswami@quickclic.net> wrote: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,IWEWelding & Metallurgical Engineering SpecialistHamilton, Ontario, Canada
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 maintenanceThe preheat method is not specified in the ASME Code. It is a matter of sound engineering practiceSent from my BlackBerry 10 smartphone.
This message contains confidential information. To know more, please click on the following link: http://disclaimer.bureauveritas.com --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 pipingRegardsPradip
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