Feild Weld rejection %
Feild Weld rejection %
(OP)
can anyone direct me to a industry publication or practice that would tell me what is the norm for acceptable weld rejection percentage for FEILD. I am hearing 5% to 7% but seems a bit high to me.





RE: Feild Weld rejection %
We usually try to manage below 2%.
RE: Feild Weld rejection %
It is usually noted in project specifications - it can vary greatly between different companies.
Another issue that can provide numerous headaches is when talking piping repairs.
Is it by joint or by length ?
On my current project there is ongoing arguements regarding this - the contractors total repair rate is 8% by joint and 0.75% by length.
Our project specification states 3% maximum (based on butt joints) but that is not for an individual welder - it is across the board project wise.
It is the contractors responsibility to set an individual welder percentage requirement that will enable him to stay under the 3% project wide.
Unfortunately for us that has not happened,
Cheers,
DD
RE: Feild Weld rejection %
My theory holds the repair rate is inversely porportional to the parallel at which welding is taking place. Just kidding...sorta...
http://www.twi-global.com/news-events/case-studies...
RE: Feild Weld rejection %
RE: Feild Weld rejection %
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Feild Weld rejection %
That job ended with his third bad radiograph, ever.
Mike Halloran
Pembroke Pines, FL, USA
RE: Feild Weld rejection %
RE: Feild Weld rejection %
RE: Feild Weld rejection %
This criteria is usually provided with the project specs, or the client will mandate the contractor to develop it, subject to his review and approval.
There are 2 Welding Repair Rates that need to be calculated and monitored: Welder repair rate and Project Welding repair rate.
Both of them have two basis of evaluation: Linear basis and Joint basis. Joint Basis is used to evaluate both the whole project and the individual welder's performance, while the Liner Basis is mainly for monitoring individual welder's performance.
Following is the criteria we're mandating the contractor to follow on our current projects:
If you are setting the criteria, you can even include one more figure that's more than what's mentioned above (e.g. 7% JB for the project and 0.7 LB & 10% JB for the individual welders) to serve as the upper control limit. Above these figures, An immediate action has to be taken (More NDT for the project, or Revoking for welders). Between these figures and the previous ones, an investigation with a corrective action is required (training, directs supervision, higher inspection points...etc.)
Mohammed Diab.
Inspection Supervisor - Saudi Aramco.
RE: Feild Weld rejection %
RE: Feild Weld rejection %
*If you have a dedicated repair welder(s), and when a weld is air-arced out - CAC, and nothing is seen on several repairs, you are having 'overcalls' from your X-ray crew.