Re: [MW:31863] PWHT required after Preheat for CS or LTCS

Dear Mr. Jamie,

ASME B31.3 is applied.

Service for Ammonia Liquid Design Temp from -35 to 70 degree C. I am not sure about whether lethal but it's a dangerous service.

Thank you for your help.

Best regards

Vào Th 5, 17 thg 12, 2020 vào lúc 11:55 Jamie Reyes <jamiejrmachineco@gmail.com> đã viết:

What is the code of construction?

What is the type of service?

Is Lethal Services involved?

Need the above mentioned information.....

Regards,

Jamie Reyes

J.R. Machine Company, Inc.

On Wed, Dec 16, 2020 at 7:47 PM thanh tung Nguyen <tungexp.268@gmail.com> wrote:

Dear Experts,

Hope you all are well.

I have a question is about the weld of the base material of CS (or Low temp. CS) with wall thickness greater than 25mm, Do we still required PWHT if we applied a preheating process before, or PWHT is no longer mandatory?

And which reference can be found?

Thank you & best regards./.

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