SSPC-PA 2 - Measurement of Dry Paint. Thickness with Magnetic Gauges. • Procedures to Measure Dry Film Thickness of Nonmagnetic Coatings over. SSPC-PA 2 Measurement of Dry Coating Thickness with Magnetic Gages The Moreover,SSPC does not issue interpreta- tions of its specifications, guides or. SSPC-PA 2. Measurement of Dry Coating Thickness with Magnetic Gages. The Society for Protective Coatings. SSPC Publication No.

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Sspc Pa2 Pdf

Coating thickness shall be measured in accordance with SSPC Paint Application Standard No. 2, SSPC- PA 2,” is a simple statement, yet often. Completion of this webinar will enable the participant to: ➢ Describe the purpose and content of SSPC-PA 2. ➢ Describe the differences between Type 1 and. SSPC-PA 2 May 1, 1 SSPC: THE SOCIETY FOR PROTECTIVE COATINGS COATING APPLICATION STANDARD NO. 2 PROCEDURE.

Yet the requirements of SSPC-PA 2 regarding gage calibration, verification of gage accuracy and adjustment procedures, the number of measurements to obtain, and the tolerance of the measurements is complex and should be fully understood by the specification writer before invoking it in a contract. We have allowed technology to make it more complex, yet easier. The standard has been updated on multiple occasions , , and It too was published in , and was updated again in The most current version of the ASTM standard focuses on proper gage use, while SSPC-PA 2 focuses primarily on the frequency of measurements and the acceptability of the acquired measurements. All references to the frequency of measurements were removed from the ASTM standard. The two documents are designed to be used in conjunction with each another. It is also important to note that both documents address the measurement of coating thickness on both ferrous and non-ferrous metal substrates. SSPC-PA 2 addresses two types of dry film thickness gages, both of which are supplied by a variety of manufacturers. Magnetic pull-off gages are categorized as Type 1 Figure 2. For these gages, a permanent magnet is brought into direct contact with the coated surface. The force necessary to pull the magnet from the surface is measured and converted to coating thickness, which is displayed on a scale on the gage. The operating principle is quite simple.

So the average of 3 readings within a circle of 1.

Dry Film Thickness based on SSPC-PA 2

You need to take 5 spots and each with 3 gage readings so that the total readings will be 15 gage readings. After completion, you should average these 5 spots, and the average should be within the acceptance criteria it means 9 thru 12 mils. So actually you have two concessions here, first single gage reading does not matter, even unusual very low gage reading can be eliminated from averaging.

However, your 5 spots average should be within specified range. Let's continue with above example, you proceed with dry film thickness readings, and you get following values: Spot 1; 10, 15, 6. Ave of What should be done if it was less than 9 mil? Another coat should be applied to reach the required DFT value, and measurement should be repeated.

Blast cleaning is used throughout this example.. Table A2 gives approximate correction values to be used when a blast cleaned surface is not available to adjust the gage.

SSPC-PA 2 Procedure for Determining Conformance to Dry Coating Thickness Requirements

A less uniform surface. The average of 10 readings on an intermediate shim. This example uses two shim values. The shim is placed on an area of the substrate that has been blast cleaned to the required standards. A portion of the substrate. If this is not available then a correction value can be applied to a smooth surface adjustment as described below.

When shims are used. If access to the bare blast cleaned substrate is not available because the coating already covers it. Standards may also be downloaded from http: As an informal initial survey. The full DFT determination. For beams between 6 m 20 ft and 18 m 60 ft.

Identify the 12 surfaces of the beam as shown in Figure A3 for each section. A beam has twelve different surfaces as shown in Figure A3. Suite Washington DC For the full DFT determination. The sample DFT determination. For example. The user does not have to require a full DFT determination for every beam in the structure. Geneva CH In lieu of a full DFT determination of each beam. Case Postale This type of error is easy to detect and correct. The standard from which this data originates is under development and has not formally been adopted as of June 1.

On a beam. Is the DFT uniform across the web? The inspector must be sure to use a gage that is not susceptible to edge effects. Repeat for the other 11 surfaces 7 surfaces if the toe is not measured. For beams less than 6 m 20 ft. If the beam is situated such that one or more of the surfaces are not accessible.

For a sample DFT determination. There will be only eight average values if the DFT of the toe is not measured. The data can be reported in a format shown in Table A3. Gross errors where the paint is obviously too thin or too thick must be corrected and are beyond the scope of this standard. On rolled beams. For tall beams where the height of the beam is 91 cm 36 inches or more.

If the total area of the part is over 10 m2 ft2. Follow the procedure described in Section A3. If there is only a single spot measurement on a surface. If a beam or miscellaneous part is situated such that one or more of the surfaces are not accessible. For inspection of a laydown. For a miscellaneous part. Structural Steel. In a laydown. The test panel shall have a minimum area of cm2 18 in2 and a maximum area of cm2 in2. Readings shall be taken at least 12 mm one-half inch from any edge and 25 mm one inch from any other gage reading.

Take two gage readings from the top third. If the additional measurements indicate the DFT in the disputed area of the panel to be below the minimum or above the maximum allowable DFT.

Discard any unusually high or low gage reading that cannot be repeated consistently. Take ten gage readings randomly distributed in the top third of the panel.

The DFT of the test panel is the average of the six acceptable gage readings. The DFT of the test panel is the average of the three means. Discard any unusually high or low gage reading.. Compute the mean average and standard deviation of these ten readings. Use a properly adjusted Type 2 electronic gage.

Use a Type 2 electronic gage. Flag for inappropriate content. Related titles. Jump to Page. Search inside document. Gustavo Eduardo Vargas Raynholds.

SSPC-PA 2 [2004] - Measurement of DFT With Magnetic Gages.pdf

Manolo Castillo. Javier Celada. Jorge Soto Vergara. David Aliaga Sayas. Bhadresh Prajapati. Allen Situ.

David Yasicov. Keron Smith. Alberto Miserere. It is the average of 3 gage reading within a circle of 1. Area Measurement: The average of 5 spots in each square ft. Expect to get different gage reading even if they are even too close to each other.

Measuring Coating Thickness According To SSPC-PA 2 – Update 2015

This happens because of the surface irregularities. Start with considering an area about square ft and then select a spot, assume a circle with a diameter of 1.

In above example, you can have a gage reading for 3 mil or 5 mil and with these gage reading the paint is not going to be rejected. The standard also goes higher than this and says, the unusual very low amount can be ignored from recording and calculation.

So the average of 3 readings within a circle of 1. You need to take 5 spots and each with 3 gage readings so that the total readings will be 15 gage readings. After completion, you should average these 5 spots, and the average should be within the acceptance criteria it means 9 thru 12 mils.

So actually you have two concessions here, first single gage reading does not matter, even unusual very low gage reading can be eliminated from averaging. However, your 5 spots average should be within specified range. Let's continue with above example, you proceed with dry film thickness readings, and you get following values: Spot 1; 10, 15, 6. Spot 5; 12, 14, 17 -Ave. The spots are Ok, now let calculate the average of these 5 spots which will represent this square ft.

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