What is your welding position of PTC #1? Assuming you are using Same WPS for all joints (category A, assuming all your welds fall under this category) and you have done your PTC#1 in Vertical position, In my opinion PTC#2 is not required {refer UG-84(i)(3)(a)(2)}.
However it could be the reason your Surveyor is asking for PTC#2, since some portion weld seam is subjected to PWHT two times, in that case even your PTC#2 should undergo PWHT twice, is n’t it? I am not clear on this; members please share your views?
From:
Sent: Friday, February 22, 2008 4:13 PM
To:
Subject: [MW:596] Re: selction of Production test coupons (PTC)
Dear Friend
Design code is ASME Section Div.-1. MOC is SA 537 Cl.2, Thickness is 57.5mm to 59.9mm, MDMT is -46 (Minus) Degree Celcius, Welding Process is SMAW, Filler metal AWS clasification E8016-C1, PTC thickness is 59.1mm, PWHT Cycle is Heating rate above 426 Degree celcius -94 Degree per hour max., Soaking Temp.-586-606 Degree, Soaking Period 2 hours 30 Minutes, Cooling rate above 426 Degree celcius -117 Degree per hour max.
Hope I clearify
Regards
Jivan Dhamane
Raghuram Bathula <raghurambathula@gmail.com> wrote:
can please explain more about your problem, Design code, MOC, Thickness involved, MDMT , Welding process used...
On Feb 19, 2008 5:57 PM, Jivan Dhamane <jivanadhamane@yahoo.co.in> wrote:
Dear Friends
I have two queries that are as follows please advice me.
- We are constructing Horton Sphere, at the initial stage our subcontractor had submitted PWHT procedure for whole sphere, but due to some accessories to inserted in the sphere for PWHT purpose they revised PWHT procedure in two parts. That is by Internal Firing Method for whole sphere except (Bottom Centre Crown plate weld) and after welding of Bottom Centre Crown plate weld PWHT is to carry out by Local Electrical Heating Method.
By doing so, BVIS Surveyor is asking for 02 Nos. Production Test Coupons (PTC). One for PWHT by Internal Firing Method and another for PWHT by Local Electrical Heating Method. We tried to convince BVIS Surveyor for only one no. PTC as Welding Procedure Specification (WPS), PWHT cycle and other all construction activities are same for both the part but BVIS Surveyor is no satisfied and asking for 02 Nos. PTC.
Waiting for your reply, till then take care and good bye
Regards
Jivan Dhamane
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