For hot-dip galvanizing applications, it is possible to measure and verify the steel surface profile according to ASTM D, Standard Test. ASTM D – 11 Standard Test Methods for Field Measurement of Surface Profile of Blast – Download as PDF File .pdf), Text File .txt) or read. ASME B, Surface Texture (Surface Roughness, Waviness and Lay); ASTM D, Standard Test Methods for Measurement of Surface Profile of Blast.
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When a project specification simply invokes ASTM D and not a specific method, the results of the surface profile measurements may differ when two different methods are used on the same project, even on the same surface and within the same area i.
Originally approved in This is done because of evidence that coatings performance in any one small area is primarily in? Leave this field empty. Last previous edition approved in as D — 93 Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are as follows:. This includes personalizing content and advertising. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
The creation of this peak-valley pattern in the surface effectively increases the surface area, providing an anchor for the coating system. The height of a single peak above an adjacent valley below is measured with a microscope for the qualitative rating that is compared with each of the methods in correlation calculations. Recent changes to ASTM D provide updated test methods to reflect the latest advances in technology and newly accepted industry research.
Same Surface, Different Results? Do not drag the instrument across the surface between readings, or the spring-loaded tip may become rounded leading to false readings. Your email address will not be published. Therefore, differences are inevitable, particularly with deeper surface profiles, and the results may or may not fall within the specified range for one of the two methods.
Visual Comparator – This test method, as well as the comparator discs available on the market, have stayed the same, and therefore there were no updates for this test method.
The four standards are: The mode is determined with the comparator of Test Method A. Measure the thickness of the tape compressed foam and non-compressible plastic?
Hold the gage by its base f4417 press?
Updates to ASTM D4417
Both the structure and the coating system protecting ast structure will move while in service. Replica Tape – Although the technology has remained mostly constant for replica tape since its introduction, industry research has addressed the sufficient number of readings required to achieve an accurate measurement.
Today, Method B and Method C are the most commonly used, so that is what we will be focusing on.
This movement may be caused by expansion and contraction of the substrate due to temperature fluctuation, or live loads placed onto a structure; for example, traffic crossing a bridge. Precision and Bias 8. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Larger repair areas or prepared hot-dip galvanized surfaces for painting can be measured with two readings taken from a minimum of three, 6×6 inch 15×15 cm areas. During abrasive blast cleaning, the mass of the abrasive and the dd4417 of the abrasive movement created by compressed air generates kinetic energy the abrasive can reach speeds of over miles per hour as it exits the blast nozzle.
Your comments will receive careful consideration at a meeting of the responsible technical committee,1which you may attend Copyright?
ICS Number Code Individual reprints s4417 or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. So, in effect the reading on the micrometer or the RTR from the replica tape represents several peaks and valleys, while the depth micrometer does not.
This can be done with the unaided eye, under 5 to 10 power magni? Anyone making use of this r4417 assumes all liability arising from such use.
Difference in Surface Profile Measurements: ASTM D Method B vs CKTA University
This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. The distance from the bottoms of many of the deepest valleys to the tops of the highest peaks maximum pro?
X4417 can be discussed and agreed upon at the pre-construction conference. Surface profile is defined as a measurement of the maximum peak-to-valley depth created v4417 abrasive impingement against a surface during abrasive blast cleaning operations, or by an impact-type power tool.
These changes reflect industry research on current tooling which revealed averaged measurements are consistently less than the values obtained using replica tape. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The base of the instrument rests on the peaks of the surface profile while the cone-shaped point projects into the valley. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Work Item s – proposed revisions of this standard. Once atsm burnishing process is complete, the replica tape is removed from the surface and the image is measured using a spring-loaded micrometer. While both the depth micrometer and replica tape methods conform to ASTM D, the measurement acquisition principles are quite different. When the abrasive impacts the surface, it cuts into the surface angular abrasives or peens the surface round abrasives and creates a series of peaks and valleys in the surface.
Larger repair areas or prepared hot-dip galvanized surfaces for painting can be measured with 10 readings taken from a minimum of three, 6×6 inch 15×15 cm areas.
Differences in Surface Profile Measurements: ASTM D4417- Method B vs. Method C
For this reason, surface pro? For measurements that fall between tape sizes, it is still required that two readings using each tape are to be averaged to comprise one reading i. There are additional techniques suitable for laboratory use not covered by these test methods. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
The standard does not address discarding outliers, but an update to the standard addressing outlier readings is planned.