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where expertise comes together
- since 1996 -
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manivannan
NDT Inspector, RT, PT, MT, VT-level III
Freelancer, India, Joined Aug 2016, 9

manivannan

NDT Inspector, RT, PT, MT, VT-level III
Freelancer,
India,
Joined Aug 2016
9
07:32 Mar-28-2018
MPI Current calculation and ammeter reading

Dear Experts,
Please do clarify the following:

1. When determining magnetizing current as per ISO 9934-1, calculation are for RMS value in case of time varying currents [i.e.AC and HWDC]

How to recognize MPI machines with analogue or digital meters reads what type of value, whether RMS, peak or mean. As the standard suggest knowing these information from equipment manufacturer. In general NO information regarding this is available in the equipment manual.

Being an inspector/operator how can it be simply recognized in the absence of details from the equipment manufacturer ??

2. ASME SEC V Art 7 provides formula for current calculations, and it is NOT specified that the calculated value is of RMS, or peak [as like it is given in ISO 9934-1]
Please clarify is it indicate RMS or peak?


 
 Reply 
 
anand
anand
09:46 Mar-06-2020
Re: MPI Current calculation and ammeter reading
In Reply to manivannan at 07:32 Mar-28-2018 (Opening).

calculate under RMS

 
 Reply 
 
Shafad
NDT Inspector,
Peekay Steel Castings(P) L.T.D, India, Joined Dec 2013, 12

Shafad

NDT Inspector,
Peekay Steel Castings(P) L.T.D,
India,
Joined Dec 2013
12
07:01 Mar-14-2020
Re: MPI Current calculation and ammeter reading
In Reply to anand at 09:46 Mar-06-2020 .

Good question ,need reply from experts

 
 Reply 
 
Bruno Zilli
Engineering, Ndt
Italy, Joined Apr 2018, 15

Bruno Zilli

Engineering, Ndt
Italy,
Joined Apr 2018
15
17:37 Mar-15-2020
Re: MPI Current calculation and ammeter reading
In Reply to manivannan at 07:32 Mar-28-2018 (Opening).

Hello

If you have to be sure about the waveform of your mpi magnetizing current, you do use an oscilloscope. A good and affordable model in by hantek, look on alibaba or ebay too.

 
 Reply 
 

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