Dear Mr. Rao,
In my previous e-mail I mention that SA is roughness but that was wrong. As already mentioned by some other members SA is cleanness of surface after blasting. Unit for roughness is Ra or Rz, two different values, one measures an average roughness the other the maximum roughness, value to be used should be mentioned in the contract / coating specification. Both Ra and Rz will be measured in microns.
Met vriendelijke groeten / Best Regards
Herman Pieper
Pieper Quality Support & Inspection
Phone: +31 (0)521 380083
Fax: +31 (0)84 7539225
Cell: +31 (0)6 51691215
www.pieper-qsi.nl
Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens Vasantharao
Verzonden: vrijdag 23 december 2011 13:31
Aan: materials-welding@googlegroups.com
Onderwerp: Re: [MW:13281] Surface roughness measurement instruments.
Dear Mr.Pieper
Thank you for your info.
Could you pl. give the units for measuring the surface roughness. As per my client spec. it is mentioned as microns only.
I think surface appearance after blasting should be SA 2 1/2 or SA 3 and should not be measured in microns.
thank you
Rao
From: Pieper QSI <info@pieper-qsi.nl>
To: materials-welding@googlegroups.com
Sent: Friday, 23 December 2011 2:07 PM
Subject: RE: [MW:13277] Surface roughness measurement instruments.
Dear Mr. Rao,
Be aware that the microns you mention is not the surface roughness but the coating layer thickness (DFT = Drie Film Thickness).
For surface roughness you will have values like SA 2,5 microns or similar and in practice mostly the comparators are used for inspection prior to first layer of coating.
After fist coating layer there is no need to measure the roughness anymore.
Met vriendelijke groeten / Best Regards
Herman Pieper
Pieper Quality Support & Inspection
Phone: +31 (0)521 380083
Fax: +31 (0)84 7539225
Cell: +31 (0)6 51691215
Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens jsrisud@gmail.com
Verzonden: donderdag 22 december 2011 14:45
Aan: materials-welding@googlegroups.com
Onderwerp: Re: [MW:13259] Surface roughness measurement instruments.
Dear Mr. Rao,
There are portable surface roughness measuring instruments to measure as required.
UK based Rank Taylor Hobson instruments are available in India.
Srinivasan
Sent from BlackBerry® on Airtel
From: Vasantharao <vasantharao@yahoo.in>
Date: Thu, 22 Dec 2011 15:38:40 +0530 (IST)
ReplyTo: materials-welding@googlegroups.com
Subject: [MW:13256] Surface roughness measurement instruments.
Dear Experts,
I work as inspection Engineer. When i go for Blasting inspection, contractor provided me profile comparator for surface roughness measurement.
Contractor do Grit blasting in the shop.
I need to measure surface roughness - 75-100 microns Painting system No#1
50-75 microns Painting system No#2
Queries
Q 1: Comparator is enough for surface roughness measurements.
Q2: Is any other tools available for roughness measurement?.
Q3: What is the normal industry practice.
Pl. provide your valuable suggestions as i'm new for painting activities.
Rao.
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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