Re: [MW:25145] PWHT Requirement as per ASME B31.3 Ed.2014

Lot of changes taken in Power and Process piping. 38mm requirement of P1 for sec8 and sec1 not for piping?

On 25-Jul-2016 7:05 pm, <dilintas@gmail.com> wrote:

All codes require PWHT for carbon and low alloy steel if thickness greater than 38 mm

Sent from my BlackBerry 10 smartphone.

From: 'wilfred kojo' via Materials & Welding Sent: Σάββατο, 23 Ιουλίου 2016 - 19:34 To: materials-welding@googlegroups.com Reply To: materials-welding@googlegroups.com Subject: Re: [MW:25140] PWHT Requirement as per ASME B31.3 Ed.2014

Loni,

The 38mm stated is based on code requirement or personal judgement. Please if by code requirement, state the code and section of the code referenced.

 

Krishna,

You are only mandated to perform PWHT if it was initially stated in WPS or design requirement. Outside these, based on code requirement, it is not mandatory.

 

Regards,

 

Wilfred Kojo

AWS CWEng

On Saturday, 23 July 2016, 14:36, 'wilfred kojo' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Krishna,

Base on requirement of the spec. it not required as long as both conditions for exemption are met.

 

Regards,

Wilfred Kojo

AWS CWEng

On Saturday, 23 July 2016, 7:49, Krishna Mudhale <kmudhale@gmail.com> wrote:

Hi Experts,
I would like to know about PWHT Requirement as per ASME B31.3 Edition 2014.
Actually for P1 Material as per Table 331.1.1 given Soaking Temperature & time for all thicknesses.
Also as per Table 331.1.3 given some exemption for PWHT of P1 material subject to two limitations ie. One for greater than 25mm thickness a preheat of 95 Deg C to be applied whereas other one is for greater than 5mm Thk multiple layer of Welding carried out.
So my question is, If thickness is of 50mm and if we are covering both the condition of preheat and multiple layer Welding then PWHT is applicable or not?

Kindly need your advise...

Thanks & Regards
Krishna Mudhale
Mob.:+91-9860459776

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