Re: [MW:13712] RE: Drop Weight Test.

Hi,

Please describe your application?

Test is more applicable for Pipelines where there is possibility that in an event of small
crack, it might run through quite a distance.

API5L Table18 & ASME B31.8 requires DWTT for linepipe after reaching a certain diameter
(If agreed, DWT testing of Pipe Body of welded pipe with D>508mm = Once per test unit of pipe)

Result values are specified in Percentage shear (ASTM E436), It assures resistance to ductility
running fracture if shear is 85% or better at the min. design temp. of the line, which a charly
bar does not, Test Coupon is comparably bigger than Charpy testing.


Regards
Manpreet Singh





From: Mohit Aggarwal
[mailto:aggarwalmohit05@gmail.com]
>Sent: Tuesday, February 14, 2012
10:17 AM
>To: materials-welding
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>Subject: Drop Weight
Test.
>
>
Respected Experts,

>
As per client Requirement We will have to conduct Drop Weight Test IN
NPCIL.. What is Drop Weight Test and how we will determine Nil ductility
transition temp..PLease reply

>
Thanks & REgards
MOhit Aggarwal.



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