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Technical Discussions
Larry Mullins , E-mail:
Larry Mullins , E-mail:
05:07 Apr-20-2007
Mag Particle Safety

I am trying to address questions relative to personal safety during magnetic particle testing. While my immediate interest is a 3K amp bench top unit, I want to open discussion to MT in general.

In testing we use a variety of units ranging from a few hundred amps to several thousand. In many configurations (i.e. coils) our ciruit is closed and arc potential is small (but real). In other applications - head shots and prods, arcing is more common. Even though we take procedural steps to minimize hazards arcing cannot be ruled out. Yes, we are talking low volts (<12), but current is high.

We have two responsibilities - 1) personal safety and, 2) a well executed test (an inspector who can see thru the protective equipment).

What is industry doing to comply with US regulations - NFPA 70E and OSHA? What are our real concerns? Thanks


    
 
 Reply 
 
John Brunk
Engineering, NDT Level III
Self employed, part-time, USA, Joined Oct 1999, 160

John Brunk

Engineering, NDT Level III
Self employed, part-time,
USA,
Joined Oct 1999
160
00:05 Apr-20-2007
Re: Mag Particle Safety
Some time ago a visitor to see indications at our wet horizontal machine (5000 amps FWR) asked if it was safe for him as he had an implanted pacemaker. I had no idea, so I called a couple of magnetic particle equipment manufacturers. They also had no idea and said they did not recall hearing the question. I contacted some manufactuers of pacemakers and implanted defibillators. I was referred to web sites that addressed safety issues for patients. The most relevant information was about to arc welding. It all came down to ask your doctor. I was able to contact one engineer at a manufacturer of these devices. He gave me some numbers for maximum static fields and alternating fields that would be reasonable for warning customers and visitors. However, pacemakers have changed a lot over time and vary among manufacturers, and there is no valid number for all.
Legal departments would probably not allow anthing to be declared officially safe for any particular model. We posted a perimeter around the machine.

Regarding arc strikes; Years ago I used a prod machine wearing shorts and a T-shirt (safety glasses, of coourse) on gently moving submarine hulls without ever being burned. The sparks were scary the first time but didn't hurt. We did grind out and re-inspect quite a few arc strikes.

One way I have seen a person injured is by holding a small part near the side of a coil in a machine with step-down automatic demagnetizing. The attraction of the part to the coil was strong enough to injure his hand.
---------- Start Original Message -----------
: I am trying to address questions relative to personal safety during magnetic particle testing. While my immediate interest is a 3K amp bench top unit, I want to open discussion to MT in general.
: In testing we use a variety of units ranging from a few hundred amps to several thousand. In many configurations (i.e. coils) our ciruit is closed and arc potential is small (but real). In other applications - head shots and prods, arcing is more common. Even though we take procedural steps to minimize hazards arcing cannot be ruled out. Yes, we are talking low volts (<12), but current is high.
: We have two responsibilities - 1) personal safety and, 2) a well executed test (an inspector who can see thru the protective equipment).
: What is industry doing to comply with US regulations - NFPA 70E and OSHA? What are our real concerns? Thanks
------------ End Original Message ------------




    
 
 Reply 
 
Frank Lund
R & D,
United Kingdom, Joined Apr 2005, 219

Frank Lund

R & D,
United Kingdom,
Joined Apr 2005
219
03:25 Apr-26-2007
Re: Mag Particle Safety
Just a thought - do you really need to use MPI? EMA and FGI techniques offer an excellent alternative, please see our website.

We can still offer a solution if you wish to remain with MPI.

----------- Start Original Message -----------
: I am trying to address questions relative to personal safety during magnetic particle testing. While my immediate interest is a 3K amp bench top unit, I want to open discussion to MT in general.
: In testing we use a variety of units ranging from a few hundred amps to several thousand. In many configurations (i.e. coils) our ciruit is closed and arc potential is small (but real). In other applications - head shots and prods, arcing is more common. Even though we take procedural steps to minimize hazards arcing cannot be ruled out. Yes, we are talking low volts (<12), but current is high.
: We have two responsibilities - 1) personal safety and, 2) a well executed test (an inspector who can see thru the protective equipment).
: What is industry doingto comply with US regulations - NFPA 70E and OSHA? What are our real concerns? Thanks
------------ End Original Message ------------




    
 
 Reply 
 

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