Question about Impact test

Date 03-19-2009 09:17

Dear you all,

We are planning to make some PQR for new project, and our client's specification requirement for impact test. So could you please advice me what code/standard guiding about number of test speciments and location for impact test.
Our products are piping (ASME B31.3), but i canot find how to make test speciment for impact, how many speciments are enough, what location to be test? etc...

Thank you very much and looking forward to hearing from you soon.

By 3.2 Inspector (***)

Date 03-19-2009 10:00

Open ASME B31.3, read the index page....that will guide you to chapter III, which is about materials.
Read the chapter and prepare your specimens accordingly.

Test the pieces and look at the acceptance criteria table......then decide if your test failed or passed.

3.2

By cong nguyen (**)

Date 03-20-2009 07:31

Thank you very much for your useful information

By js55

Date 03-20-2009 13:38

Do a search on the subject. There are some very good posts by jon20013 on impact testing per 31.3.

By cong nguyen (**)

Date 03-22-2009 12:14

Thank you very much Mr js55, I will try to find the posts by jon20013

By hogan

Date 03-20-2009 15:44

read the code

By cong nguyen (**)

Date 03-22-2009 12:13

I know that the code usually mention, but as you know, the forum is the place for us to share information and it would help us to quickly improve knowledge. Thank you any way.

By jon20013 (*****)

Date 03-26-2009 05:14

Cong;

Some of what you seek may be in your client specification. We normally do 3 CVN's at 3 different locations on our PQR's, usually at 300, 600 and 900 positions; weld metal, HAZ and unaffected base metal so total of 9 CVN's per coupon (we do PQR's on job materials; pipe rather than plate, which is most common for ASME IX). Your client may require more or less. Important to remember thickness of qualifications for impacts B31.3 allows 1/2 weld metal thickness to thickness +6mm, which is different than ASME IX (normally 2T for max thickness). In all cases, governing code (B31.3) will supercede all and any ASME IX variables so don't rely strictly on ASME IX. Also, temperature of CVN should be specified in your client specification.

By cong nguyen (**)

Date 04-01-2009 00:38

Thank you very much, your information is very helpful for my job.
Thank you very much!