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Join Date: Sep 2011
Posts: 9

Impact Test

07/05/2013 5:28 AM

Dear Everyone,

Do you know, what size (like length, width) should be prepare when impact test of pipe or fitting (elbow and tee) 12" SCH 80...

thank you

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Anonymous Poster #1
#1

Re: Impact Test

07/05/2013 6:46 AM

No.

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Power-User

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Location: Central Midwest
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#2

Re: Impact Test

07/05/2013 8:28 AM

Yan....

Perhaps you are talking about Charpy V notch testing ?

There is much background information on the internet regarding Charpy testing

Impact testing specimen size is dictated by the specific ASTM test procedure for the material.

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Posts: 9
#7
In reply to #2

Re: Impact Test

07/07/2013 9:12 PM

MJCronin

yes, this for charpy V testing..

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Guru

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#3

Re: Impact Test

07/05/2013 8:55 AM

Are you speaking of DWTT?

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Guru

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#4

Re: Impact Test

07/05/2013 9:01 AM

We know that one dimension will be 12".

Get your copy of the piping spec and read it.

All your questions indicate that you know nothing about what you are doing. Can you prove otherwise?

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#5

Re: Impact Test

07/05/2013 11:26 AM

IIRC, the standard test coupon is 10mm x 10mm x 50mm, with a notch machined to specific shape and dimensions. If the part to be tested is not large enough to accommodate the standard coupon, smaller sizes are possible, with corrected acceptance criteria.

12" Sch 80 is thicker than 10mm, so full-size coupons can be used.

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Anonymous Poster #2
#6

Re: Impact Test

07/06/2013 3:14 AM

According to ASTM A370, (Standard Test Method and Definitions for Mechanical Testing of Steel Products).

The standard specimen size Charpy impact testing is 10 mm × 10mm × 55mm.

Subsize specimen sizes are:

10 mm × 7.5 mm × 55mm,

10 mm × 6.7 mm × 55 mm,

10 mm × 5 mm × 55 mm,

10 mm × 3.3 mm × 55 mm,

10 mm × 2.5 mm × 55 mm.

V-notch: 2mm deep, with 45° angle and 0.25mm radius along the base.

According to EN 10045-1,

Standard specimen sizes are 10 mm × 10 mm × 55 mm.

Subsize specimens are: 10 mm × 7.5 mm × 55 mm and 10 mm × 5 mm × 55 mm.

According to ISO 148

Standard specimen sizes are 10 mm × 10 mm × 55 mm.

Subsize specimens are: 10 mm × 7.5 mm × 55 mm,

10 mm × 5 mm × 55 mm and 10 mm × 2.5 mm × 55mm.

I suggest you to read ASTM A 370 or SA 370 (Clauses from 19 thru 28) and ASTM E-23 for more information.

Following links will give extensive information about charpy impact testing

http://en.wikipedia.org/wiki/Charpy_impact_test


http://www.wmtr.com/Content/charpy.htm

http://www.twi.co.uk/technical-knowledge/faqs/material-faqs/faq-what-is-charpy-testing/

http://www.twi.co.uk/technical-knowledge/job-knowledge/mechanical-testing-notched-bar-or-impact-testing-071/

http://www.twi.co.uk/technical-knowledge/job-knowledge/notched-bar-or-impact-testing-part-ii-072/

http://www.twi.co.uk/technical-knowledge/faqs/structural-integrity-faqs/faq-how-do-charpy-values-determined-using-sub-size-specimens-relate-to-results-from-full-size-specimens/

http://www.atlastube.com/images/stories/pdf/Standards_and_Materials/CIDECT-1B-2_03.pdf

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#8

Re: Impact Test

07/08/2013 5:07 AM

For pipe you can use standards sizes, but for fittings you me be have to use reduce sizes (Anonymus poster give you the sizes. You can find the location for the samples, pipe, in API 5L. For fittings is more difficult, ANSI or MSSP Standards.

According to ASTM A370, the standard specimen size for Charpy impact testing is 10 mm × 10mm × 55mm. Subsize specimen sizes are: 10 mm × 7.5 mm × 55mm, 10 mm × 6.7 mm × 55 mm, 10 mm × 5 mm × 55 mm, 10 mm × 3.3 mm × 55 mm, 10 mm × 2.5 mm × 55 mm. Details of specimens as per ASTM A370 (Standard Test Method and Definitions for Mechanical Testing of Steel Products).

According to EN 10045-1,[ standard specimen sizes are 10 mm × 10 mm × 55 mm. Subsize specimens are: 10 mm × 7.5 mm × 55 mm and 10 mm × 5 mm × 55 mm.

According to ISO 148 standard specimen sizes are 10 mm × 10 mm × 55 mm. Subsize specimens are: 10 mm × 7.5 mm × 55 mm, 10 mm × 5 mm × 55 mm and 10 mm × 2.5 mm × 55mm.

Good Luck WP

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