[MW:30100] Is PWHT required

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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