Impact test- minimum thk requirement

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victor george

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May 22, 2013, 6:33:28 AM5/22/13
to material...@googlegroups.com, Arul prakash
Hi Experts,
 
Please explain what is the minimum thickness requirement of impact test.
 
Material: A790 S31803 pipe
Size: 1/2' Sch 80 (WT- 3.73mm)
Sour service
 
 
Question: Is it possible to do impact test on 3.73 thk?
 
 
Best Regards,
DV.George
 

bruce alavi

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May 22, 2013, 6:39:01 AM5/22/13
to material...@googlegroups.com, Arul prakash
Impact testing is not related to min or max materials thickness it is as per the project and code specification, check your project and design requirements
 
Very Best Regards
Behrooz Alavi

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james gerald

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May 22, 2013, 6:54:40 AM5/22/13
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Impact test not required/cannot be performed if the thickness is below 2.5mm.
 
Check with Metallurgy Lab whether they can machine your sample with thickness 3.73mm and perform Impact.
 
If yes, then Impact test need to be performed at -46/-50degC for Duplex.
 
Thanks & Regards

J.Gerald Jayakumar
00968-99438165
From: victor george <dvge...@gmail.com>
To: material...@googlegroups.com
Cc: Arul prakash <r.arul...@gmail.com>
Sent: Wednesday, May 22, 2013 2:33 PM

Subject: [MW:17738] Impact test- minimum thk requirement

Rajaram chandrasekaran

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May 22, 2013, 7:25:33 AM5/22/13
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dear experts
you can do impact test on your material 1/2" sch 80_3.73mm thickness by making the impact  specimen sample as 10 X 2.5 X 55 as per astm a370 and astm e23 or by making the specimen thickness as more than 80% of the material thickness

regards
rajaram.c

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Ramin Kondori

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May 22, 2013, 10:50:05 AM5/22/13
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Dear Victor:

In our project we have similar requirements for Duplex and Super Duplex as James mentioned (regardless of thickness) where it requires impact test at -46 degC and results should demonstrate average of minimum 27J and no result less than 20J).

Regards
Ramin Kondori
Sr. QA/QC Engineer
SINOPEC

r.ko...@petroyada.com
+98-2123592322
+98-9132150320

K E Satyanarayana

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May 22, 2013, 11:55:56 PM5/22/13
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Hi
yes it is possible upto 2.5 mm thk.
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*Best Regards,*
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*K.E.SATYANARAYANA*
*SURVEYOR*
*BUREAU VERITAS INDIA PVT. LTD.*

kannayeram gnanapandithan

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May 22, 2013, 11:51:58 PM5/22/13
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2/3 of 27 joules is also acceptable in some codes
Pandithan
welding consultant

On 5/22/13, Ramin Kondori <ramink...@gmail.com> wrote:
> *Dear Victor:*
>
> In our project we have similar requirements for Duplex and Super Duplex as
> James mentioned (regardless of thickness) where it requires impact test at
> -46 degC and results should demonstrate average of minimum 27J and no
> result less than 20J).
>
> Regards
> *Ramin Kondori*
> *Sr. QA/QC Engineer
> *
> *SINOPEC*
>
> r.ko...@petroyada.com
> +98-2123592322
> +98-9132150320
>
>
> On Wed, May 22, 2013 at 3:24 PM, james gerald <gerr...@yahoo.com> wrote:
>
>> Impact test not required/cannot be performed if the thickness is below
>> 2.5mm.
>>
>> Check with Metallurgy Lab whether they can machine your sample with
>> thickness 3.73mm and perform Impact.
>>
>> If yes, then Impact test need to be performed at -46/-50degC for Duplex.
>>
>> Thanks & Regards
>>
>> J.Gerald Jayakumar
>> 00968-99438165
>> *From:* victor george <dvge...@gmail.com>
>> *To:* material...@googlegroups.com
>> *Cc:* Arul prakash <r.arul...@gmail.com>
>> *Sent:* Wednesday, May 22, 2013 2:33 PM
>> *Subject:* [MW:17738] Impact test- minimum thk requirement

victor george

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May 23, 2013, 12:17:47 AM5/23/13
to material...@googlegroups.com, Arul prakash, Venu Ragu
Thanks Gents.
It is very clear that impact test shall be performed up to 2.5mm thk.
 
Appreciate all your valuable guidance.
 
Best Regards,
Victor.

zubair

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Oct 15, 2015, 4:01:11 AM10/15/15
to Materials & Welding
Dear ramin which code and section you refer -46 Cdeg,


Please elavorate ..

Harish Kannepalli

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Oct 15, 2015, 4:19:55 AM10/15/15
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For this diameter and thickness, it is not possible to perform  impact test.

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Regards,
Mr. Harish.

Devin

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Oct 15, 2015, 5:09:08 AM10/15/15
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George
sub-size impact test specimen could be used when  full sized specimen is not possible due to the thk of the weldment. But usually impact requirement is required only when the thk of production metal exceeds 16mm. 
Hope it helps.

Elshan Feyzullayev

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Oct 15, 2015, 6:11:03 AM10/15/15
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Hi DV George

The charpy requirements starts from 5 mm and above. Below 5 mm is not required as per ASTM A370  which is Standard Test Methods and Definitions for Mechanical Testing of Steel Products page 5 Note 7 2003 publication.  

On the other hand example 5 section 7 in EEMUA 153 which is SUPPLEMENT TO ASME B31.3 states as follows: 

"""""7 BS 3603, Charpy V-notch impact testing at low temperature BS 3603 : 1991 Sec. 12.2.3 states that impact testing shall not be carried out on tubes less than 6 mm thick. For the particular example in which a nominal wall thickness of 5.6 mm is specified, impact testing will not be carried out. However impact values may be assumed as those given for thicker material supplied to the same specification. """"" 

Also most of project specifications don't require charpy test below 6 mm.  Hence, in your case the impact test is not required. I think this clarifies your doubt.  

Best regards Elshan.

________________________________
> Date: Thu, 15 Oct 2015 12:11:43 +0400
> Subject: Re: [MW:23717] Impact test- minimum thk requirement
> From: harishka...@gmail.com
> To: material...@googlegroups.com
>
> For this diameter and thickness, it is not possible to perform impact test.
>
> 2013-05-22 14:33 GMT+04:00 victor george
> Hi Experts,
>
> Please explain what is the minimum thickness requirement of impact test.
>
> Material: A790 S31803 pipe
> Size: 1/2' Sch 80 (WT- 3.73mm)
> Sour service
>
>
> Question: Is it possible to do impact test on 3.73 thk?
>
>
> Best Regards,
> DV.George
>
>
> --
> To post to this group, send email to
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>
> The views expressed/exchnaged in this group are members personel views
> and meant for educational purposes only, Users must take their own
> decisions w.r.t. applicable code/standard/contract documents.
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> Regards,
> Mr. Harish.
>
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