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Samidurai
, Technical Manager
Singapore, Joined Nov 2014, 13

Samidurai

, Technical Manager
Singapore,
Joined Nov 2014
13
03:41 Sep-13-2019
CALIBRATION PROCEDURE FOR CALIBRATION BLOCKS

Dear All,

Please provide some guidance for internal calibration of calibration blocks such as V1, V2, ASME etc.. also suggest equipments required for that.
Thank You.

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 823

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
823
02:22 Sep-16-2019
Re: CALIBRATION PROCEDURE FOR CALIBRATION BLOCKS
In Reply to Samidurai at 03:41 Sep-13-2019 (Opening).

Not required. Cal blocks come with certification.

 
 Reply 
 
Samidurai
, Technical Manager
Singapore, Joined Nov 2014, 13

Samidurai

, Technical Manager
Singapore,
Joined Nov 2014
13
03:44 Sep-17-2019
Re: CALIBRATION PROCEDURE FOR CALIBRATION BLOCKS
In Reply to Anmol Birring at 02:22 Sep-16-2019 .

Thank You for the reply.
As a NDT company representative when we are applying for accreditation, need to maintain a Master Piece with manufacturer calibration cert and internally calibrated Work Piece. That is the reason i have asked. Thank You.

 
 Reply 
 
laurie
Australia, Joined Feb 2019, 40

laurie

Australia,
Joined Feb 2019
40
04:50 Sep-17-2019
Re: CALIBRATION PROCEDURE FOR CALIBRATION BLOCKS
In Reply to Samidurai at 03:44 Sep-17-2019 .

Check with your accreditation provider if that's acceptable to write a procedure where you compare reflectivity and ultrasonic measurements of dimensions of your master piece and your working piece.

 
 Reply 
 
Satwant
,
Singapore, Joined Jun 2019, 3

Satwant

,
Singapore,
Joined Jun 2019
3
11:04 Sep-17-2019
Re: CALIBRATION PROCEDURE FOR CALIBRATION BLOCKS
In Reply to laurie at 04:50 Sep-17-2019 .

Yes, As per Singapore accrediation Council, You can calibrate working calibration blocks by comparison with reference Standard calibration Block.Its acceptable to write a procedure where you compare reflectivity and ultrasonic measurements of dimensions. And Reference Standard calibration Block must calibrated by an accrediated lab or NMI. hope it will be useful for you Mr. Samidurai

BR

 
 Reply 
 
Vens Fernandez
Vens Fernandez
09:07 Dec-08-2019
Re: CALIBRATION PROCEDURE FOR CALIBRATION BLOCKS
In Reply to Satwant at 11:04 Sep-17-2019 .

In aviation we use various reference/ calibration standards which resemble the parts of the aircraft being inspected. Most of the calibration/ reference standards are purchased from the aircraft/ component manufacturer and issued with Certificateof Conformance.
In most cases, the artificial defects cannot be visually seen as they are in different layers of material.
Are there any requirements to calibrate these reference/ calibration standards at regular intervals. Based on your experience, what is the procedure for calibrating these calibration/ reference blocks.

 
 Reply 
 
Vens Fernandez
Emirates Ailine Engineering, United Arab Emirates (UAE), Joined Dec 2019, 1

Vens Fernandez

Emirates Ailine Engineering,
United Arab Emirates (UAE),
Joined Dec 2019
1
10:49 Dec-09-2019
Re: CALIBRATION PROCEDURE FOR CALIBRATION BLOCKS
In Reply to Satwant at 11:04 Sep-17-2019 .

We have a few hundred reference blocks. To perform a comparison check ( reflectivity/ amplitude ), we will need to purchase a duplicate of all the in-use reference blocks as they are all different in geometry, design, materials and size of artificial defects. So far, we are unable to establish if there is a requirement to have them checked and calibrated at specified intervals. Are there any documents that specify that these reference standards have to be checked/ calibrated..

 
 Reply 
 
Andrew Robinson
Sales,
PH Tool Reference Standards, USA, Joined Feb 2012, 6

Andrew Robinson

Sales,
PH Tool Reference Standards,
USA,
Joined Feb 2012
6
15:09 Dec-09-2019
Re: CALIBRATION PROCEDURE FOR CALIBRATION BLOCKS
In Reply to Vens Fernandez at 10:49 Dec-09-2019 .

I know of no code or specification that calls for periodic recertification of NDT calibration or reference blocks. That said, more and more block owners are sending manufacturers such as PH Tool their blocks for this service. The most common driver for this seems to be internal specifications. Blocks maintained in perfect condition will not change dimensions over time, however those subjected to excessive wear or abuse have been observed to be out of tolerance compared to new. In addition, blocks of unknown origin may be discovered to have been out all along, so giving them a look after some time may make sense. We see customers send us blocks anywhere from 2 to 5 years from original purchase.

1
 
 Reply 
 
J.B.
J.B.
01:43 Dec-11-2019
Re: CALIBRATION PROCEDURE FOR CALIBRATION BLOCKS
In Reply to Andrew Robinson at 15:09 Dec-09-2019 .

we had this discussion in our team also a long time. WE had avoided in our general processes descriptions for recalibration of equipment a fixed numerical figure of Month/Yeras to demand a recalibration but requested a periodic intervall, which afterwards was defined either by specific procedures or a subcontractors own process description, which had to explain their choice by plausible estimations. Nevertheless while establishing a strict ISO 9000 / 9100 quality system including lab qualifications according ISO 17025 it was necessary to put fixed values into those process specs dealing with equipment recalibration.

A good example which is open accessible I found here:

https://johncockerill.com/app/uploads/2019/05/MQF-F-EN_CMID.pdf

It follows the usual way of definitions:

"5.19 MANAGEMENT OF MEASUREMENT AND INSPECTION APPARATUS
Measurement and inspection means used for products for CMID must be listed, identified, kept in good condition, correctly stored, and calibrated in accordance with manufacturer instructions, recognized standards, or a calibration plan, or, failing this, at least once every two years. A life file must be maintained per item, depending on its calibration history. The supplier must be able to prove that the calibration chain linking its means international or national standards is respected. The supplier is permitted to carry out internal calibration of instruments in accordance with the national or international standards applicable (ISO, NF, BS, NBN, etc). Reference standards must be linked to national or international standards and verified at least once every three years by an organisation meeting the requirements of § 5.14. Subcontracting: for the purposes of calibration, the supplier must use subcontractors meeting the requirements of § 5.14. "
This company demands 2 years or 3 years at least if no other standards have to be applied. In our company things were tighter, here at least one year was demanded. You may find those tighter demands e.g. by government agencies e.g. in case of Aerospace EASA/FAA/etc. requirements, same maybe valid in rail industry etc.
Nevertheless your company has to define the procedure in their Quality Handbook describing the applied quality system.

Be aware that you have to deal with tracebility.
Intersting paragraph regarding the question who is allowed to do the recalibration:

5.14 METROLOGY LABORATORIES
Qualification of this type of laboratory comprises two parts: 
Proof of ISO 17025 certification through third-party accreditation, or which the scope covers the calibrated devices used for CMID. 
Proof of relationships their calibration standards between and the international standards OR An ISO 9001 certification with the establishment of an organisation conforming the additional requirements of ISO 17025 but not certified for it. Taking into account the uncertainties and the influence factors on the measurements Compliance is demonstrated by the subcontractor (the laboratory).

This is a rather good exmple what must be done. I recommend reading the CMID supplier quality manual, which is a rather short document compared to other companies documents for the same purpose.

 
 Reply 
 

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