13:03 Apr-18-2009 Re: Circular magnetizationIn Reply to Kusnadie at 12:28 Apr-18-2009 (Opening).
You could try the adjacent conductor method. Place the shooting rod on top of the pipe (make sure it's electrically insulated from the pipe) and then shoot it. Use a Burmah Castrol strip or equivalent to see if there is enough residual circular field to do the inspection. if not shoot the rod again (and again if necessary) until you get enough residual field. Also check how far around the circumference of the pipe the magnetic field is strong enough to do the inspection. This will tell you how many places around the circumference you have to shoot the rod to inspect the full circumference of the pipe.
If you can't get a strong enough magnetic field using this method, then I'm afraid it will have to be the AC yoke
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