As we know, After ASME B31.3 2012 editions, the PWHT requirements for greater than 20mm thick has been changed to 95 Deg Preheat for all thickness P.No1 material.
Though its excepted from latest editions, pl check the following for PWHT requirements
1. Pl check the Applicable ASME edition as per your contract
2. Pl check do u have qualified WPS/PQR without PWHT for higher thickness
Many clients specify in contract to follow 2012 edition, to perform PWHT for greater than 20mm thick. This is to avoid the potential risk involved when higher thickness pipe welding at a later stage.
Thanks and Regards
Rameshkannan D
"What you have learned is a mere handful; What you haven't learned is the size of the world – Avvaiyar"
On Wed, Apr 14, 2021 at 8:08 PM pravean ashok <gujulapravean@gmail.com> wrote:
Yes brother compulsory you have to do preheating but you need to maintain the temperature so my recommendation is better for coil induction coil heating is good to maintain the temperature--On Wed, 14 Apr, 2021, 7:55 am QA/QC, <adnanziad49@gmail.com> wrote:Dear masterswe want to weld a pipeline api 5l x70 thhikness 28 mm so we want to know the requierement of PWHT CODE API 1104AND ALSO FOR A333 GR 6 THICKNESS 45 MM CODE B31.3 . PWHT REQUIERMENTCAN ANYONE CLARIFY IT FOR ME--
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