Impact test for A106

[PVT]

Dear Experts,

 

Process piping with material A106- thickness = 35 mm, design temp: 0 - 150 °C . My question: As per ASME B31.3, impact test for weld joint is required or not? If required, what temperature to impact test?

 

Thanks!

[Raghuram Bathula]

Assuming you are asking for Gr B (refer Fig 323.2.2A,  falls under Curve B). what is your project amb temp? if it is colder than zero you might consider that temp, else imapct test at zero deg C is required for 35mm thickness.

[pgoswami]

Hello PVT,

 

Usually A/SA 106 is not a reliable material for design temperature  below -20 DegC. If the use of C-Mn steel is insisted  A/SA -333 Gr-6 would be the choice. By definition , materials falling under this specification( A/SA-333 ) are meant for low- temperature applications.

 

If the lowest design temperature is -150 DegC( as mentioned below), then the choice should be austenitic S.S grades, 304L or 316L by default.

 

Thanks

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-p...@sympatico.ca,

pgos...@quickclic.net

 

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of PVT
Sent: Monday, May 06, 2013 6:19 AM
To: material...@googlegroups.com
Subject: [MW:17605] Impact test for A106

Dear Experts,

 

Process piping with material A106- thickness = 35 mm, design temp: 0 - 150 °C . My question: As per ASME B31.3, impact test for weld joint is required or not? If required, what temperature to impact test?

 

Thanks!

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[PVT]

Dear Experts,

 

As per B31.3 / Fig 323.2.2A Note 1:  Any carbon steel material may be used to a minimum temperature of −29°C (−20°F) for Category D Fluid Service.

This means that the case ( as mentioned) not required impact test. Is this correct ?

 

Thanks/

[bruce alavi]

Pgoswami

 

I think the question PVT was asking was, is the impact test required for the type of piping material weld joints? and if so at what temperature, I think the temperature range specified in his mail was not 0 to -150 but 0-150C he was not asking which piping materials would be best suitable, but the answer is yes the impact test is required for the weld joints and the ideal temperature should be -20

 

Very Best Regards

Behrooz Alavi

From: pgoswami <pgos...@quickclic.net>
To: material...@googlegroups.com
Sent: Monday, May 6, 2013 2:34 PM
Subject: [MW:17607] RE: 17605] Impact test for A106

Hello PVT,

 

Usually A/SA 106 is not a reliable material for design temperature  below -20 DegC. If the use of C-Mn steel is insisted  A/SA -333 Gr-6 would be the choice. By definition , materials falling under this specification( A/SA-333 ) are meant for low- temperature applications.

 

If the lowest design temperature is -150 DegC( as mentioned below), then the choice should be austenitic S.S grades, 304L or 316L by default.

 

Thanks

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario , Canada .

Email-p...@sympatico.ca,

pgos...@quickclic.net

 

[PVT]

Dear Experts

 

The temperature range is 0/ +150 Deg C ( design temp ).

 

Dear Alavi

"the answer is yes the impact test is required for the weld joints and the ideal temperature should be -20"

 

Please explain to me why temperature should be -20 Deg C while min design temp is 0 Deg C

Thanks to your help

[bruce alavi]

PVT

Here in southern Iraq the air temp even in the winter does not go much below -1 at the extreme, however all our sour service pipes are impact tested at -29, so -20 in your situation is to cover all probabilities and is a safe temp for impact testing, as the cost differentials between testing at 0 C and -20 C are minimal 

 

Very Best Regards

Behrooz Alavi

[sudalai kannan]

Dears,

My opinion is Carbon steel will withstand -46 Deg.C/10 J. for base materials and -46Deg. C / 80-90 J. for Weld and HAZ.

So if u are do impact test @ -46, u can use this procedure up to -46 Deg. C.

Regards,

M.Sudalai