Background of SSPC PA 2; Overview and Purpose of SSPC-PA 2 (); Purpose of ASTM D ; Definitions; Gage Descriptions; Calibration & Verification. ASTM D focuses on gage use. • SSPC-PA 2 () focuses on acceptability of acquired measurements. • Both address ferrous and non-ferrous metal. This standard is issued under the fixed designation D ; the number immediately following the 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and . manufacturer’s specifications, n—a statement or set.
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If you like to setup a quick demo, let us know at support madcad. No items in cart. The number of areas that must be measured for coating asgm varies, depending on the size of the coated area. The scale is not linear, as will be discussed below. Awtm the most critical section in the document, Section 8, describes how many areas to check, the size of the areas, the number of measurements to obtain in each area, and the steps to take if spot or area measurements do not conform to the specification.
For decades, the industry was cautioned about taking coating thickness measurements within one inch of an edge, let alone on an edge. No minimum gage accuracy requirement to qualify for use. Measured shims individually labeled with a stated thickness value commonly supplied with Type 2 gages can also be used for gage adjustment.
It is v7091 to note that both documents address the measurement of the DFT of coatings on ferrous and non-ferrous metal substrates.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
Each spot consists of a 1. D70091 the same example, if a two-point verification procedure is adopted, then a two-mil and an eight-mil set of coated standards slightly below and above the intended range of use is appropriate.
In such d791, the user will need to obtain BMRs from the prepared, uncoated substrate described earlier for Type 1 gages. Unusually high or low gage readings that cannot be repeated consistently are discarded. Three sets of four circumferential spot measurements should be obtained on pipe spools less than 10 feet in length.
If no Restriction Level is specified, default is based on conformance requirement. You will have access to the subscription via our webpage standard. I am assuming you are using an electronic gage:.
With our Web Subscription service you are provided instant, secure access to your standards of choice. The values given in parentheses are for information only.
Addresses measurement of coatings on ferrous and non-ferrous metal surfaces. Adjusting Type 2 gage using a measured shim on the surface to which the coating axtm be applied This step sounds reasonably straightforward but poses several hidden challenges.
This includes personalizing content and advertising. He holds an A. Depending on the coating type and the prevailing service environment, the specifier can select the DFT restriction level for a given project. SSPC-PA 2 has undergone ast changes in an attempt to make it more complete; more in concert with ASTM D; easier to use in the shop and field; and more flexible in providing the specifier with options for coating thickness restrictions based on the type of structure, the coatings to be applied, wstm the service environment.
DFT of pipe spools not loaded on cart or rack are typically measured individually. Dry film thickness gages are calibrated by the equipment manufacturer, its authorized agent, or an accredited calibration laboratory under controlled conditions. Adjustments to the gage may or may not be required. Courtesy of SSPC If there is no place to measure in a given direction, then no measurement in that direction is necessary.
Spot measurement definition was expanded. For a given measurement direction or unit atsm, any compliant area 21 unit preceding a non-compliant area or unit is designated as suspect, and, as such, is subject to re-inspection after corrective measures are taken.
Conformance to Specified Thickness: If you have a large number of standards, a quantity discount applies, making the service even more desirable for companies.
Content only available by subscription. A single instrument reading. The average of the acceptable gage 112 is the spot measurement. If the gage is dropped or suspected of giving erroneous readings during the work shift, its accuracy should be rechecked.
Five different Coating Thickness Restriction Levels established. This article was a very helpful reference for me when I was updating my company coating spec.
For example, if the intended use is between 4 and 6 mils, then a five-mil coated standard is appropriate. This culminates in a total of 75 spot measurements 15 x 5 and a minimum of gage readings 15 x 5 x 3.
A test certificate or other documentation showing traceability to a national metrology institution is required. Measure the coating thickness. August 26, at 2: Link to Active This link will always route to the current Astn version of the standard. This average BMR is then deducted from subsequent coating thickness measurements to remove any effect of the base metal surface and its conditions.
Obtaining base metal readings with Type 1 gage.
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Thank you so much for the information on this page. February 5, at 2: Verifying accuracy of Type 2 gage using a certified shim. It is cheaper to have your standards available asmt than to buy them on paper.