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- since 1996 -

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Technical Discussions
Ash
United Arab Emirates (UAE), Joined May 2015, 8

Ash

United Arab Emirates (UAE),
Joined May 2015
8
06:52 Jun-23-2015
Grinding of Tong Marks on Tong Space/Tools Body

Hi,

According to DS-1 do OCTG Inspector required to grind tong marks on tong space/tool body? Please guide with reference.

Thanks

Ash

 
 Reply 
 
Andreas
NDT Inspector, Specially in the oilfield
Tuboscope Vetco(Deutschland)Gmbh, Germany, Joined Oct 1999, 131

Andreas

NDT Inspector, Specially in the oilfield
Tuboscope Vetco(Deutschland)Gmbh,
Germany,
Joined Oct 1999
131
13:30 Jun-23-2015
Re: Grinding of Tong Marks on Tong Space/Tools Body
In Reply to Ash at 06:52 Jun-23-2015 (Opening).

Hallo Ash ,

the reference is the DS-1 see 3.4.4 a &b.


Regards

Andreas

 
 Reply 
 
Bruce McPherson
Consultant
MFL Services, United Kingdom, Joined Mar 2009, 26

Bruce McPherson

Consultant
MFL Services,
United Kingdom,
Joined Mar 2009
26
14:02 Jun-23-2015
Re: Grinding of Tong Marks on Tong Space/Tools Body
In Reply to Ash at 06:52 Jun-23-2015 (Opening).

I agree with the DS-1 references provided by Andreas, but would add that when the EMI is performed, tong marks on the tube body will almost certainly produce indications above the threshold level and will therefore require investigation and prove up.
If tong marks are the cause of the indications, then grinding them down and then performing the EMI again will result in lower indications.
So, although DS-1 does not specifically state that the inspector must grind tong marks, in practice, it will be very difficult to do the job correctly if you don't grind tong marks on the pipe body.
When the pin is screwed into the box, the hoop stress levels in the box tool joint are very high, and tong marks on the outside of the box tool joint can result in localised stress concentrations which exceed the torsional strength of the material and cause the box to split.
For this reason, I would strongly advise that tong marks on box tool joints are removed by grinding (as long as the tool joint OD is not reduced below the minimum for the acceptable class of pipe)
Tong marks on pin tool joints are not dangerous (the pin tool joint is far and away the strongest part of the pipe) and I would not bother grinding them unless they were making it difficult to see the pipe identifiaction.

Best regards

Bruce McPherson



 
 Reply 
 

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