Re: Impact test temperature

From: <Gang>
Date: Wed May 05 2004 - 06:03:00 EDT

A small puzzle!
Do you guys (and gals) know which was the biggest laboratory where the "Charpy" test was done towards the end of the 19th century?
The amswer is the Atlandic Ocean and the test specimen was the "Titanic".
Regards.
C. V. Gangadharan.
--- Gordon.Reddek@Alcan.com wrote:
> Sajit,
>
> GOOD question. I believe the answer is an error in
> the DEP. -50F is in
> fact -45.6C. I have a book that lists ASTM333-gr6
> as requiring an impact
> test of -50F or -46C. The same book lists the
> impact testing requirement
> of A350 LF2 as -50F or -45.6C. So it appears as
> though you could have
> tested that flange at -45.6C. Brittle fracture is
> nasty stuff. It would
> obviously always be safer to test at a lower
> temperature. It would be
> interesting to know if that flange survives at
> -45.6C.
>
> Regards,
>
> Gordon Reddek
>
>
>
>
>
> Sajit Viswan <sviswan@tebodin.co.om>
> 05/05/2004 01:45 PM
> Please respond to PipingDesign
>
>
> To: "PipingDesign. com (E-mail)"
> <pipingdesign@yahoogroups.com>
> cc:
> Subject: [PipingDesign] Impact test
> temperature
>
>
> The Shell DEP on "Metallic materials - Prevention of
> brittle fracture"
> states that,
>
> For a lower design temperature between -50 °C and 0
> °C, impact tested
> carbon steel (e.g., for piping, ASTM A 333-gr 6)
> shall be used, with the
> impact testing having been performed at -46 °C with
> an average impact
> value of 27J.
>
> Can anyone clarify why it is enough to impact test
> at -46 deg C than at
> the -50 deg C design. Though the difference of 4
> deg C may not any
> appreciable significance.
>
> Can the same be applied to ASTM A350 Gr LF2 flange.
>
> To qualify a WPS for the welding of a A350 Gr LF2
> flange an impact test
> was done at -50 deg C. The test, I believe was done
> in accordance to that
> specified in the ASTM specification. The test
> resulted in a failure.
>
> Sajit
>
>
>
>
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---

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Win a $20,000 Career Makeover at Yahoo! HotJobs <a href="http://hotjobs.sweepstakes.yahoo.com/careermakeover">http://hotjobs.sweepstakes.yahoo.com/careermakeover</a> Received on Wed May 05 06:03:00 2004