API 1104

Date 03-30-2006 20:23

Talking about thickness range. In API 1104 for procedure qualification, para. 6.2.2, e 3, it states "Nominal pipe wall thickness greater than 0.750 in. Does this mean that if I qualify a procedure using .875" thick coupon my thickness range would be from .750" to unlimited?
Help and thanks in advance.

By chall

Date 03-30-2006 20:35

The referenced paragraph is for performance testing of welders, not procedure qualification.

Paragraph 5.4.2.5 (applicable to procedure qualification) says exactly the same thing, but no thickness ranges are given. I believe it was intended to have the same thickness range listed in 6.2.2.e.3 (see 5.3.2.3).

This was a long way of saying that I believe your interpretation is correct.

BTW, I am looking at the 19th ed, Sept. 1999.

Charles

By Richard V. Roch (**)

Date 03-30-2006 21:06

You are quite right. Para. 5.4.2.4 states that a change from one wall thickness group to another constitutes an essential variable. Para. 5.3.2.3 says examples of suggested groupings in 6.2.2 items d. and e. I guess the implication here is that one wall thickness group in 6.2.2 is from 0.188-0.750 and thickness greater than 0.750 would be another group.
thanks

By chall

Date 03-30-2006 21:17

Yes, I agree.
Charles