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 a large number of measurements are being obtained, the user may opt to verify gage accuracy during measurement acquisition for example, hourly. DFT of pipe spools not loaded on cart or rack are typically measured individually.
If no Restriction Level is specified, then the default asmt Level 3, which is based on the version of SSPC-PA 2 what many users of the standard have become accustomed to. This average BMR is then deducted from subsequent coating thickness measurements to remove any effect of the base metal surface and its conditions. All of the area within five feet of any non-compliant spot measurement is considered ast. You will have access to the d091 via our webpage standard. Acquisition of more astk three gage readings within a spot is permitted.
Print 1 2 3 4 5 page sstarting from page current page. Measurement of Coating Thickness Step 5: All definitions related to gage calibration, accuracy and adjustment are incorporated by reference in ASTM D January 29, at This article was a very helpful reference for me when I was updating my company coating spec.
Haarik, You are not calibrating the coating thickness gage, but rather verifying accuracy, then adjusting. For example, assume that the specification requires a four- to six-mil application of primer.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
Non-compliant areas are demarcated using removable chalk or another specified marking material and documented. As a result, obtaining single-point measurements may not accurately represent the actual coating system thickness. To help assure the reliability of the coating thickness measurements, ASTM D describes three operational steps that must be performed before taking the measurements.
Spot measurements are obtained on repeating structural units or elements of structural units until two consecutive units in each direction are conforming or until there are no more units to test. On complex structures or in other cases where making spot measurements at five-foot intervals is not practical, spot measurements are taken on repeating structural units or elements of structural units.
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Thanks to the author for the explanation. Measure the coating thickness. Electronic gages are categorized as Type 2 Fig. There are three categories of coated area: He holds an A.
It is important to note that both documents address the measurement of the DFT of coatings on ferrous and non-ferrous metal substrates. Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions of the standards required in your work.
No items in cart. One type of magnetic gage referenced in original SSPC-PA 2 for measuring dft Figures courtesy of the author except where otherwise indicated. Some 1 may have several small pipe sections, and the total coated surface may exceed square feet. The certified shim should be placed onto a smooth, uncoated metal surface to remove any effect of the surface roughness during this process.
D7019 are not calibrating the coating 112 gage, but rather verifying accuracy, then adjusting. The number of areas that must be measured for coating thickness varies, depending on the size of the coated area. Sectors Arbeidsliv Bygg, anlegg og eiendom Elektro Elektronisk komm. While some gage operators may simply subtract a fixed amount for example, 0. Courtesy xstm SSPC If there is no place to measure in a given direction, then no measurement in that direction is necessary.
Obtaining base metal readings with Type 1 gage. Thank you so much for the information on this page. You do not need to zero the gage.
January 28, at 5: A frequency of measurement for coated steel beams girders and coated test panels is also provided in the appendices to SSPC-PA2. The correction curve may or may not cover the full range of the gage, but should cover the intended range of use. Adjusting Type 2 gage using a measured shim on the surface to which the coating will be applied This step sounds reasonably straightforward but poses several hidden challenges.
Dry film thickness gages are calibrated by the equipment manufacturer, its authorized agent, or an accredited calibration laboratory under controlled conditions.
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February 7, at 2: Once verification of accuracy and adjustments are made, a minimum of three gage readings are taken within 1. Second, some Type 2 gages cannot be adjusted. The operating principle is simple. The above article was very informative and useful, thanks for sharing it.
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Keane Award of Merit. Within each area, five randomly spaced spots are selected.