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Re: [MW:4941] Calibration of MPI yoke and validity.

By Materials & Welding

Hello Mr. Andrew

Here is what I mean from ASME SEC V T-762 Lifting Power of Yokes (MR. Arunachalam A, already provide the exact wording of code what I am trying to say)

So I again repeat no third part calibration certificate required for the weight of calibration only the weight used for calibration must be from reputable manufacture. Unless it is specific requirement from client, seeking the calibration certificate from third party is wasting of money and time.

 (d) Each weight shall be weighed with a scale from a reputable manufacturer and stenciled with the applicable nominal weight prior to first use. A weight need only be verified again if damaged in a manner that could have caused potential loss of material.



On Fri, Apr 23, 2010 at 3:28 PM, Shashank Vagal <nach_sam@yahoo.com> wrote:
The gimmick here is what exactly to take for a "reputable manufacturer" of (weights and) scales and what would be the acceptable scale to weigh and confirm weight. What accuracy is allowed in weighing? The same weight measured by 2 or 3 scales of the same reputed manufacturer can vary. Then what?
As we do, we check the magnetizing power to detect certain depth defects in a mock up; while the stated ASME rulings are observed as a routine guideline.
Even a coil's performance depends a lot on how it is stored, one year is a long enough time when it can deteriorate and won't be as functional as in the beginning.
Just some cautious soundings............

--- On Fri, 23/4/10, Arunachalam A <arunvani@gmail.com> wrote:

From: Arunachalam A <arunvani@gmail.com>
Subject: Re: [MW:4936] Calibration of MPI yoke and validity. Date: Friday, 23 April, 2010, 10:15 AM


The following is the text of ASME Section V , Article 7 
T-762 Lifting Power of Yokes
(a) Prior to use, the magnetizing power of electromagnetic
yokes shall have been checked within the past year.
The magnetizing power of permanent magnetic yokes shall
be checked daily prior to use. The magnetizing power of
all yokes shall be checked whenever the yoke has been
damaged or repaired.

(b) Each alternating current electromagnetic yoke shall
have a lifting power of at least 10 lb (4.5 kg) at the maximum
pole spacing that will be used.

(c) Each direct current or permanent magnetic yoke
shall have a lifting power of at least 40 lb (18 kg) at the
maximum pole spacing that will be used.

(d) Each weight shall be weighed with a scale from a
reputable manufacturer and stenciled with the applicable
nominal weight prior to first use. A weight need only be
verified again if damaged in a manner that could have
caused potential loss of material.

Hence, No need for a third party certificate for the calibration and it OK if it has the manufactures certificate showing the weight lifting capacity and other test results

arun


On Mon, Apr 19, 2010 at 12:35 PM, Nishad AK <nishadamk@gmail.com> wrote:
Good day,
 
I have a query regarding the calibartion of MPI yoke both Electomagnetic & permanent magnetic type.
Does that should hold a Valid calibration certificate by the Third party calibration body or is that ok it has the manufactures certificate showing the weight lifting capacity and other test results.

--
Thanks and Regards

Nishad AK
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