Impact Testing - Smallest Pipe/Schedule 1

[Angsi2]

Are there any restrictions on pipe/schedule sizes below which specimen and satisfactory impact testing cound not be performed? ASTM A370 does not provide any guidelines on this.

The smallest specimen per A370 is 2.5mm x 10mm x 50mm.

Any input will be appreciated.

 

[metengr]

Angsi2;
Yes, when you test a subsize CVN specimen, the impact energy will be higher because there is less restraint in the location of the notch. To compensate for this specimen geometry effect, impact values may be adjusted downward.

Most likely, you will need to develop your own correlation by running subsize specimens and comparing to impact data regarding full size specimens, if this is a common grade of steel. Be careful here because this is not that simple,

 

[metengr]

Actually, found this reference that might help

http://www.twiprofessional.com/content/ksplm002.html

 

[blacksmith37]

In API 5CT (ISO 11960), SR 16 has a fairly comprehensive impact requirements for tubulars ,especially when full size charpies are not possible. Unfortunately ,the latest copy I have is 1995 -5th ed.