[MW:631] Re: Impact test thickness limits per B31.3 for PQR

I want add more to this debate

 

For LTCS material PQR qualification we have to satisfy both Sec IX and B31.3 Requirements.

 

1.As per sec ix requirements QW 403.6

The minimum base metal thickness qualified

is the thickness of the test coupon

T or 5⁄8 in. (16 mm),

whichever is less. However, where

T is less than 1⁄4 in.

(6 mm), the minimum thickness qualified is T/2.

Here T is less than 6mm.i.e 6mmTest coupon thickess is also not accepted.Only 5.9 mm thickness is accepted if we want lower range qualified to be T/2.Otherwise lower range is T only.

2.For PQR upper limit as per B31.3 T+6mm

On Fri, Feb 29, 2008 at 8:52 AM, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:

It's a good point to debate Mr Mahuri!

 

Probably your are referring to A-5(a) in the said table, where the range is given T/2 to T+6.4mm (in place of 2T against QW403.6 for the max thickness qualified)

In my opinion if mix both these you land up in qualifying more procedures.

 

I think it similar to PTC (production test coupon) in Table 323.3.1, where you can weld PTC for each thickness range and just do Impact only, other wise if you consider this for PQR qualification range you might have do even bend and tensile or any other test required for PQR as per contract. Think

 

Please share your views members.

 

-----Original Message-----
From: snehkumar [mailto:mahuri18@gmail.com]
Sent: Thursday, February 28, 2008 2:48 PM
To: Materials & Welding
Cc: Mahuri Snehkumar (TIPO - QA/QC)
Subject: query

 

 

Dear friends,

 

Can some one suggest me,

 

 

 

For Low Temperature Carbon Steel, Procedure Qualification is it

necessary to satisfy ASME B31.3, Table 323.3.1 along with all

parameters of ASME IX.

 

 

 

Regards,

 

Snehkumar L. Mahuri

 

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