Dear all, SA 2/12 & SA 3 is only degree of cleanless ant not measured by microns. SA 2/12 near white metal and SA3 is white metal no millscale.
--- On Sat, 12/24/11, Pieper QSI <info@pieper-qsi.nl> wrote:
From: Pieper QSI <info@pieper-qsi.nl>
Subject: RE: [MW:13287] Surface roughness measurement instruments.
To: materials-welding@googlegroups.com
Date: Saturday, December 24, 2011, 11:07 AM
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. 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. 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 Pieper Quality Support & Inspection 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
Date: Thu, 22 Dec 2011 15:38:40 +0530 (IST) Subject: [MW:13256] Surface roughness measurement instruments. 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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