damaged fitting

[carbonear59]

we have a fitting built under B16.9 , our code of construction is B31.3 normal service . the fitting (30 " elbow )has been damaged (don't know how and don't care ).
can someone please tell me where i can look to find if the deflection measured now renders the fitting usable or headed for the scrap pile ?

thanks in advance

 

[metengr]

Damaged - how? Review ASME B16.9 for guidance, and dimensions.

 

[carbonear59]

thanks for asking metenger , here are the #'s , we have a 30 " forged fitting with .375 W.T. The damaged area can best be described as an indentation about 12 " in diameter
(parabola shaped ) that is roughly .300 " deep at the center . i have looked at ASME B16.9 but don't see anything i can use as guidance I think B16.9 is basically for manufacturing ,this is more of a 'fit for service ' issue . is there another place to look ?the whole line will be hoydrotested and i intend to issue a Request for Information to the Client but i want to be able to point to a code reference when i issue it .

any help would be appreciated .

 

[rneill]

Given this is new construction, as an end user I would reject the damaged fitting regardless of considerations around fitness for service. The component is not in "new" condition and I wouldn't accept it in a newly constructed system. If the damage caused the fitting to fail to meet the dimensions (considering specified tolerances) of the applicable standard, I would simply reject the fitting.

With regards to the question of assessing the significance of the dent, there are a number of sources you could look to for guidance on the fitness for service question:

- ASME B31.8S
- API 1156
- API 1160
- US CFR Part 192 and Part 195
- "Appraisal and Development of Pipeline Defect Assessment Methodologies" by MSL Engineering

In general, any dent with any indication at all of a gouge or kink is not acceptable and should always be removed. I'm also not sure how the fact that this dent is in an elbow might otherwise affect the screening criteria mentioned in the above documents for dents that do not have gouges or kinks.

 

[rneill]

I took a quick look and found the MSL Engineering report freely available on the Minerals Management Website ....

http://www.mms.gov/tarprojects/336/336AC.pdf

 

[SNORGY]

I think I would be inclined to compare the defect against the rejectable defect dimensional criteria set out in SA-960, even though the fitting isn't "new". It would be a good indication as to what wouldn't fly in the "new" condition, and therefore what shouldn't fly in any condition.

Regards,

SNORGY.