Re: Re: [MW:29282] What is Deference Between LP & HP welder?

This question is little comic from your client Atif, basically ASME already seggregated as per P nos as per their R&D / essentials and followed by that we have client owners manual for brining in amendment of his requirements, but without basic of this if your clients asks then really it is serious comic as LP welder cannot weld HP, as it doesnt make any sense when there is no essential changes.

But some clients make strignent on some cases alike where you have hot tapping or where u have TIE-IN requirements and owners manual will be stipulated like saying least repair rates or no such specicfic defects, in this case possible.

Here in your case officially its a green light as there wont be any change in essential and even bringing in amendment in clients specific as stringent without any serious consequences will not make any sense.

Maybe your client can ask categorization to monitor the welders ability on both HP and LP or track their repairs, tracking purpose, its acceptable, but it doesnt mean that he can stop HP to LP welders welding LP to HP joints.

Thanks.

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Regards,

MOHAMED MUNEEB MAHABOOB

From: TDK YOKESH

Date: 2019-03-11 14:42

To: materials-welding

Subject: Re: [MW:29253] What is Deference Between LP & HP welder?

Hi folks,

Correct me if I am wrong. If the code of construction is B31. 3, LP refers to Low pressure piping  which is Chapter V design and requirements while HP refers to High pressure piping Chapter IX design and requirements. Chapter IX is very stringent in its material selection,welding procedure qualification, welders qualification and NDE acceptance.  Change in material grade, heat treatment condition is essential. Impact toughness is mandatory for WPQT, PWHT is mandatory for butt welds, welder qualification requires impact toughness testing. The thickness are project specific as it  pressure temp rating is greater than  2500#. There are more to it. 

On Wed, Mar 6, 2019, 11:15 AM Atif <atif.aslam@bishoinfra.com> wrote:

Dear All,

Our client is asking for make categories for our welder such as HP & LP,  in Combined cycle power plant project, anybody can help me that why we need to do this and what is the welder qualification testing procedure/system for HP & LP welder? 

Regards:

Atif.

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