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Home > Forums > Engineering Codes, Standards & Certifications > Engineering Codes, Standards & Certifications > API (American Petroleum Institute) Code Issues Forum

API 1104 Code Clarification Question

Read More Threads Like This One

Jellopool (Industrial)

16 Feb 11 6:43

When PT testing a butt weld on 14" (14" O.D.) pipe a toe crack is discovered that is 3 5/8" in length. Under API 1104 can this crack be repaired using a qualified repair procedure?

Under API 1104 what method of inspection must be used to inspect an area of a repair?

After some digging around in the code I think the answers are tucked away in sec. 10.2 & sec.10.3.1 respectively. Can anyone validate this for me?

Cheers,

Jellopool

SJones (Petroleum)

16 Feb 11 21:19

Quote:
can this crack be repaired

Yes, but only if authorisation is given by the company to do so.

Quote:
what method of inspection must be used

If you are the contractor, PT; if you are the company, any method you like.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

Kiwi2671 (Structural)

17 Feb 11 1:17

Jellopool,
Is that a typo ?
How on earth do you get a crack 3 5/8" (90 mm) long ?
Something seriously wrong with the WPS to get a crack that size.
Good luck with repairing it.
Regards,
Kiwi

Eddycurrentguy (Petroleum)

23 Feb 11 6:00

Jellopool is on the right track.

10.3.1 indicates the same method of discovery (PT) to be used for the inspection of the repair area.  Having said that, I would not have used PT; Radiography is the standard for girth welds.  Almost any MPI method (dry, fluorescent, white contrast) would be more sensitive and easier to prepare and clean.  It's possible the 'crack' is actually undercut.

Also, like Kiwi mentioned, you have a serious problem if you have a crack 3" + long.  Either the WPS has fundamental flaws or it is not being followed.  You should not be repairing a crack this long...I hope the pipe is moving water only...

waterpipe (Mechanical)

18 Mar 11 8:32

@Eddycurrentguy:
Don't underestimate cracks in a water pipe.

Regards,
Waterpipe

Eddycurrentguy (Petroleum)

22 Mar 11 5:53

Indeed, I see your point, but but all things being equal, the concequences of a waterline failure are less than a gas or oil pipe.

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