Standards Flashcards
Various standards define methods of obtaining DFT. SSPC -PA 2 references 1___ for calibration, verification of accuracy and adjustment of gauges. These standards describe procedures for shop and field 2___ to a specified coating DFT range on both 3___ and ___ metal substrates using non-distructive thickness gauges. (Magnetic and Eddy Current.)
- ASTM D7091
- Conformance.
- Ferrous and nonferrous.
A project specification, however, may require other standards. Inspectors must be careful to use the?
Specified standards.
If the specification does not state a required standard then it is good practice to ___ ___ ___. Or suggest a standard at the pre-job conference so all parties might have a say.
Choose one yourself.
SSPC-PA 2 requires 1___ spot measurements for each 2___ measured.
- 5
2. 100 ft.
As per SSPC-PA 2 a spot reading must include a minimum of ___ readings to account for surface irregularities in the 1.5 inch circle.
Three
According to SSPC-PA 2 spot readings are taken within a ___ inch circle.
1.5 inch.
The latest revision of SSPC-PA 2 has a few changes, the major change in this latest revision is the parameters which must be met to conform to the standard. The revised standards utilizes ___ ___ levels. The specifier selects one of the levels for the specification.
Restriction levels.
These seem to dictate the range (what should be 80-120 percent) and includes their own ranges based upon the four levels.
For SSPC-PA 2:
For areas under 1___ randomly select and measure three 2___ areas. If the DFT in those areas complies with the specified limits, proceed. If not, take more measurements to define the 3___ ___, then begin again.
- 1000 sq ft.
- 100 sq ft
- Non-conforming area.
According to SSPC-PA 2:
For areas over 1,000 sq ft measure the first 1___ as normal. If DFT is okay, randomly select and measure a 2___ sq ft section for each additional 3___.
- 1,000 sq ft.
- 100 sq ft
- 1,000 sq ft section.
According to SSPC-PA 2 the procedures for measuring DFT may be varied by ___ between interested parties.
Agreement.
The revised PA-2 includes the following non-mandatory appendices.
Appendix 1: ___example of average thickness measurement.
Appendix 2: Methods for measuring DFT on ___ ___ (___).
Appendix 3: Method for measuring DFT on ___ ___ ___, ___ ___ and miscellaneous parts after shop coating.
Appendix 4: Methods for measuring DFT on ___ ___ ___.
Appendix 5: Method for measuring DFT on thin coatings on coated steel ___ ___ that have been abrasive blasted.
Appendix 6: Method for measuring DFT of coatings on ___.
Appendix 7: Method for measuring DFT on coated ___ ___ exterior.
Appendix 8: Examples of the adjustment of type 2 gauges using __.
1: Numeerical.
2. Steel beams (Girders).
3: Lay down of beams, structural steel
4: Coated test panels.
5. Test Panels.
6. Edges.
7. Steel Pipe
8. Shims.
If SSPC-PA-2 is the referenced standard in the specification for DFT the inspector must become ___ ___ of the requirements of the standard. This will take a great deal of study
Very knowledgeable.
SSPC describes two methods of calibration adjustment and defines DFT gauges according to the two methods. Magnetic Pull-Off Gauges are termed 1____ ____ __ while Fixed Probe Gauges are termed 2____ ____ ___.
- SSPC PA-2 Type I.
1. SSPC PA-2 Type II.
Another standard often referenced in specifications is ____ ___ __.
ASTM D 7091
Standard practice for nondestructive measurement of of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Non-conductive Coatings applied to nonferrous metals.
(Like SSPC PA 2) ASTM D 7091 describes the measurement of the thickness of nonmagnetic coatings applied to 1___ metal substrates. As well as 2___ ___, ___ ___ coatings applied to nonferrous metals.
Another standard that may specified is BS 3900 (Methods of test for paints, part C5)
- Ferrous
2. Nonmagnetic, non-conductive.
