Re: [MW:30105] Is PWHT required

it is advice to do any modification or alteration with proper procedure.  this procedure shall be required approval from client / nominated TPI. PWHT depends on various parameters line P. No./ Group No. /thickness/ Pressure part/No Pressure parts etc  UCS -56 is refer for the same for decide PWHT required. 

for eg: for carbon steel grade material UCS-56-1 is applied. further there is provision provided to perform welding with preheating upto thickness 38mm ( general note a) and b)) without preheating. the similar provision is also incorporated in latest edition of B31.3 
Regards

Rishikesh kumar 

On Thu, Oct 3, 2019 at 2:00 PM José Juan Jiménez Alejandro <jjjimeneza@gmail.com> wrote:

Greetings !, I see that it is a modification or alteration, usually this type of work is stamped "R" of the NB, I suggest you speak it with your Authorized Inspector that you have assigned to your company (this in case your company is certified with ASME and NB), as for the PWHT depends on the number P of the material and its thickness, consult it with your ASME Inspector.
Regards!.

El mié., 2 oct. 2019 a las 0:06, Nadakuditi kiran kumar (<kinnu78@gmail.com>) escribió:

Dear Gentleman,

We have received two vessels as per drawing. ASME U stamp done on both vessels, there is one bottom outlet nozzle of 6"NB in both vessels. Now client is asking us to remove the flange of the nozzle and hook up with piping. My doubt is 

1. Whether we have to take approval from authorized inspector before going to do any modification.

2. After hook up we have to do PWHT for that hook up joint

Please clarify, if possible please provide code reference.

Line SERVICE not call any PWHT

Construction code for vessel is ASME Sec VIII, Div 1, piping construction code is B 31.3.

Thanks in advance,

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Ing. José Juan Jiménez Alejandro

Independent Consultant in Parts

and Pressure Equipment

SSI-TPI

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Skype: jjjimeneza

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