[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 ur queries.

 

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.

 

1. 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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