Wednesday, March 20, 2013

RE: [MW:17173] Re:Pneumatic Leak test required for Reinforcement Pad covering Pressure containing welds

Dear Pankaj,

As per UG 37 (g) of section VIII the tell tale holes shall not be welded, it may be left open or it may be plugged but "

"If the holes are plugged, the plugging material used shall not be capable of sustaining pressure between the reinforcing plate and

the vessel wall"

If its leaking thru RF pad then there is a serious problem in the weldment, that has to be repaired after removing the water with relevant WPS

You just cant weld the TT hole, you have to eradicate the source of leak.

Cheers

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pankaj.kolhe@wipro.com
Sent: Monday, March 18, 2013 7:05 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:17140] Re:Pneumatic Leak test required for Reinforcement Pad covering Pressure containing welds

Dear all

Can we plug the TT hole by welding after pneumatic test

And what to do if leak has been observed thru TT hole of Nozz RF pad during hydrotest of vessel can we plug directly by reducing pressure ATM?

Pankaj Kolhe

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of MM
Sent: Sunday, March 17, 2013 12:13 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:17130] Re:Pneumatic Leak test required for Reinforcement Pad covering Pressure containing welds

Dear Mr. Veera Samy,

Pls. correct me if I am wrong,

As per UG 37 (g) tell tale hole is a "SHALL" for RF pads, but performing leak test is "MAY be performed" only, so it's not a must to perform a pneumatic leak test

And as per UG 82, when pressure or non pressure parts extends over weld, it shall be ground flush only and code doesn't asks for pneumatic test

Mr. Saravanan,

The term RF pad denotes the branch connections / nozzles contains RF pads, bcoz saddles, lifting lugs can also cover the weld, which is not called as RF pads.

Reinforcement is the term used where the opening is compensated as stated in UG 37

Cheers

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of cbe swamy
Sent: Thursday, March 14, 2013 9:44 AM
To: materials-welding@googlegroups.com
Cc: Karthik BV; saravananmurugappan@gmail.com
Subject: FW: [MW:17078] Re:Pneumatic Leak test required for Reinforcement Pad covering Pressure containing welds

Dear Mr Saravanan, How are you, After BV where are YOU: nice to meet you from MW.

Your Quiry is, " Pneumatic Leak test required for Reinforcement Pad covering Pressure containing welds "

Ans.: 200% required

and In addition that as bellow:

Telltale Holes. Telltale holes may be used to provide some positive indication when the thickness has been reduced to a dangerous degree. Telltale holes shall not be used in vessels that are to contain lethal substances [see UW-2(a)], except as permitted by ULW-76 for vent holes in layered construction. When telltale holes are provided, they shall have a diameter of 1⁄16 in. to 3⁄16 in. (1.5 mm to 5 mm) and have a depth not less than 80% of the thickness required for a seamless shell of like dimensions. These holes shall be provided in the opposite surface to that where deterioration is expected. [For telltale holes in clad or lined vessels, see UCL-25(b).]

Reinforcing plates and saddles of nozzles attached to the outside of a vessel shall be provided with at least one telltale hole [maximum size NPS 1⁄4 (DN 8) tap] that may be tapped for a preliminary compressed air and soapsuds test for tightness of welds that seal off the inside of the vessel. These telltale holes may be left open or may be plugged when the vessel is in service. If the holes are plugged, the plugging material used shall not be capable of sustaining pressure between the reinforcing plate and the vessel wall.

Thank & Best Regards,

M Veera SAMY- Bureau Veritas.

Coimbatore-9790964530

Date: Thu, 7 Mar 2013 09:20:18 +0530
Subject: Re: [MW:16982] Re:Pneumatic Leak test required for Reinforcement Pad covering Pressure containing welds
From: spkarthikeyanbe@gmail.com
To: materials-welding@googlegroups.com

Dear Saravanan,

Which means that, Shell with RF Pad welds and Pad with Nozzle Welds. that is to be pneumatically tested at a pressure of 1.5 bar(g).

Regards,

Karthikeyan

On Wed, Mar 6, 2013 at 4:16 PM, Saravanan Murugappan <saravananmurugappan@gmail.com> wrote:

MrAjay,

My query is different.Whether ITP(Inspection Test Plan) Mentioning :

"Pneumatic Leak test required for Reinforcement Pad covering Pressure containing welds"

My question is RF Pad covering pressuring containing weld means what????? 1.Whether weld seams under RF Pads?or 2. Branch connections contains RF pad?

Which is correct?

On Wed, Mar 6, 2013 at 10:05 AM, ajay pathak <ajaypathak85@gmail.com> wrote:

Dear Sir,

Please note that Leak test of reinforcing pads shall be performed in accordance with the ASME Code Section V. Each reinforcing pad shall have one test hole, tapped for 1/4 inch NPT, and located at least 45 degrees off the longitudinal axis of the vessel. This applies to each pad or segment of a multiple piece pad. The welds of each pad or segment shall be given an air and bubble solution pressure test before the test of the vessel. The test pressure shall be at least 1.0 bar (g) but shall not exceed 1.4bar (g). The test holes shall be left open for use as telltale holes.

Regards,

Ajay Pathak

On Tue, Mar 5, 2013 at 10:44 PM, Saravanan Murugappan <saravananmurugappan@gmail.com> wrote:

Dear Friends,

1.As the above stated subject;can anyone explain me Briefly When it is required??

2.Contractor Saying that they wont do Pneumatic Leak test for Branch connections consists of RF Pads.They are objecting Because "They do leak test whenever the longitudinal or circumference weld seams covering the RF pads.(That means "Weld seams " when it comes under RF pads.)

3.Is this Contractor Query about this valid?...and Plz guide me to follow the exact requirements.

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Thanks & Regards,

Karthikeyan. P,

Surveyor.

BUREAU VERITAS (INDIA) PRIVATE LIMITED,

30/6, 3rd Floor, Aparna Tower, New Dhamu Nagar,

Puliakulam Road, Pappanaiken Palayam,

Coimbatore - 641 037, India.

Mobile No.: 9994999503

Materials & Welding

Wednesday, March 20, 2013

RE: [MW:17173] Re:Pneumatic Leak test required for Reinforcement Pad covering Pressure containing welds

"Pneumatic Leak test required for Reinforcement Pad covering Pressure containing welds"

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