ASTM D7091 – 12 PDF
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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It describes the methods and recommended frequency for verifying the accuracy of gages and for adjusting optimizing the equipment and lists the reporting recommendations. Search book title Enter keywords for book title search. Pipe spools that are not loaded onto a e7091 or cart are typically measured individually Fig. An area is defined as approximately square feet.
A minimum of three gage readings is obtained in each spot, culminating in a minimum of 15 gage readings within an area. Dd7091 each area, five randomly spaced spots are selected.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
This requirement makes Type 1 gages very difficult to use. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Place the gage probe on a certified coated standard and adjust the gage as necessary. They are typically regarded to be faster, more accurate, and easier to use. The contained information helps for easy understanding. If no Restriction Level is specified, default is based on conformance requirement. These gages use electronic circuitry to convert a reference signal d70911 coating thickness and are more popular than Type 1 gages.
While the gage may be out of tolerance by 0. Method for Measuring the Dry Film Thickness of Coatings on Edges For decades, the industry was cautioned about taking coating thickness measurements within one inch of an edge, let alone on an edge.
Before measuring coating thickness on edges, the user should verify the gage and probe for accuracy by placing a thin, flexible shim certified or measured onto the prepared, uncoated edge. February 7, at 2: Acquisition of more than three gage readings within a spot is permitted. First, once the surface is coated for example, with a primeran uncoated surface may no longer be available for subsequent gage adjustments, so the user may want to have a similar uncoated surface prepared and reserved for future gage adjustments on a given project.
A single instrument reading. Depending on the coating type and the prevailing service environment, the specifier can select the DFT restriction level for a given project. To guard against measuring with an inaccurate gage, SSPC-PA 2 requires that gage accuracy be verified at a minimum at the beginning and end of each work shift according to the procedures described in ASTM D Thanks to the author for the explanation.
January 22, at 7: A minimum thickness and a maximum thickness are normally specified for each layer of coating. This average BMR is then deducted from subsequent coating thickness measurements to remove any effect of the base metal surface and its conditions. Addresses measurement of coatings on ferrous and non-ferrous metal surfaces. Please login to your authorized staff account to use this feature.
For example, if a gage reading was 5. He holds an A. A test certificate or other documentation showing traceability to a national metrology institution is required. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Isolation of nonconforming areas required measurement of each square foot area painted during the work shift.
SSPC-PA2 prescribes a frequency of coating thickness measurement based on the size of the area coated. Leave a Reply Cancel reply Your email address will not be published.