Re: [MW:24543] PWHT of branch connections.//B31.3

Codes are written after careful consideration. So it is good to argue but better to follow the code. If there is any other code with other options, that needs discussion. More over the thicker side is considered as main line and thinner side as branch line.

Rgds

Prakash Gotimukul

ASME AIS, Technical Manager ASME/ISO/PED

 gprakash31@gmail.com.

Tel: +9714 2778511 Mob:+97152 979 5678

On Fri, Mar 18, 2016 at 10:42 AM, Raghuram Bathula <raghurambathula@gmail.com> wrote:

that is the reason controlling theromocouples and monitoring thermocouples are recommended in D10.10 (amount of energy required to heat the branch small compared to run pipe), similar recommendations are provided in WRC 452.

concern could be distortion or induced stresses due to circular or spot heating

On 18 March 2016 at 10:02, Hareesh K V <hareesh13h@gmail.com> wrote:

Dear Sir,

My doubt is, the width of the  band (HB or GCB) along the length of main pipe is on the logic of diminishing temperature and its metallurgical effects. Why not it is not considered to do the pwht of the branch in the vicinity area of branch/RF pad only by the same logic of HB and GCB near the weld area of RF pad/branch.( This will reduce the consumption of power, coiling time etc.)

Thanking you

Hareesh K V

On Mar 18, 2016 9:52 AM, "Raghuram Bathula" <raghurambathula@gmail.com> wrote:

Dear Hareesh

Yes, it is. guidance for placement of thermocouples can be reffered to para 6.6.4 of AWS D10.10

control thermocouples  on larger pipe and monitoring thermocouples  on smaller branch connection

On 18 March 2016 at 06:03, Hareesh K V <hareesh13h@gmail.com> wrote:

Dear Sir,

As per ASME B31.3, for branch connections, PWHT is to be done for the entire circumference of main pipe. Is there any exceptions/code interpretations for that, in Carbon steel material or Alloy steel material (SA335 Gr P9,95)?

For example: A 3/4" branch is done on the main pipe of 60" dia. As per the code requirement, the entire 60" dia is to be wrapped with coil and PWHT is to be done.

Thanks in advance.

Regards,

Hareesh K V

+91-8547859202

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