14:51 Nov-12-2009 Paul Skidmore NDT Inspector USA, Joined Dec 2008 2
Mag Particle and Senativity check
IF you have a central conducter rod and a 44 foot of 4 1/2 .250 wall casing pipe how can you check the senativity of mag particle inspection being done on it beside a castrol strip. I have had several differnt people say it cant be done
15:34 Nov-12-2009 Jim Draper Consultant, ASNT Level III MT PT RT VT Draper NDT, USA, Joined Jul 2009 99
Re: Mag Particle and Senativity check In Reply to Paul Skidmore at 14:51 Nov-12-2009 (Opening).
You could also use a QQI. It is a thin piece of metal with grooves in it. There is one with three circles cut into it, each circle a different depth. That would work. You could also use a hall effect gauss meter to verify the magnetic flux density on the surface of the pipe. It should be between 30 and 60 gauss. Or, if you have a piece of the pipe with a known discontinuity of the type you will be looking for, you could use that to prove the sensitivity of the test.
16:08 Nov-12-2009 Andreas NDT Inspector, Specially in the oilfield Tuboscope Vetco(Deutschland)Gmbh, Germany, Joined Oct 1999 126
Re: Mag Particle and Senativity check In Reply to Jim Draper at 15:34 Nov-12-2009 .
Go to the side of ASNT at look there for the technian V8NO2 , it explain well how to chek should be done ba the castrol strip.
Since you have a radial field in the pipe ,there is hardly ay field outside of the pipe.
Easiest way with the strip is to grind a small gouge inthe pipe.
Anyway if you inspect casing acc to API ,there is a recomandation for the minimum cd amperagedepende of the weight of pipe and unit used.
Andreas
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