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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Updates to ASTM D4417
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. Hold the gage by its base and press? Precision and Bias 8. Typical comparator surfaces are prepared with steel shot, steel grit, or sand or other nonmetallic abrasive, since the appearance of the pro?
The values given in parentheses are for information only. There are additional techniques suitable asym laboratory use not covered by these test methods. Inspection Instruments Pipeline Coatings — Volume 2: Leave this field empty. 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.
Each area is marked giving the nominal pro? Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: NOTE 2—The test methods measure different values and the qualitative rating on which the applicability was determined also measures a different value.
Last previous edition approved in as D — 93 Visual Comparator – This test astj, as well as the comparator discs available on the market, have stayed the same, and therefore there were no updates for this test method.
Differences in Surface Profile Measurements: ASTM D4417- Method B vs. Method C
A number in parentheses indicates the asm of last reapproval. Typically, the higher the coating thickness the greater the surface profile depth.
Historical Version s – view previous versions of standard. The information provided herein is not intended as a representation or warranty d4471 the part of the AGA. The depth is displayed on the gage in mils 0.
The mode is determined with the comparator of Test Method A. These changes reflect industry research on current tooling which revealed averaged measurements are consistently less than the values obtained using replica tape.
Updates to ASTM D | American Galvanizer’s Association
The values given in parentheses are x4417 information only. 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. Originally approved in Do not drag the instrument across the surface between readings, or the spring-loaded tip may become rounded leading to false readings.
Recent changes to ASTM D provide updated test methods to reflect the latest advances in technology and newly accepted industry research. During abrasive blast cleaning, the mass of the abrasive and the velocity 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. Then determine the mean for all the locations and report it as the pro?
ICS Number Code For more information related to surface preparation as it relates to hot-dip galvanized steel, you can contact AGA Corrosion Engineer Alana Hochstein at ahochstein galvanizeit.
ASTM Zstm contains three methods of measuring surface profile depth: The comparator areas are used with or without magni? Work Item s – proposed revisions of this standard. The instruments described are readily portable and sufficiently sturdy for use in the field.
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 c4417 cm areas. The base of the instrument rests on the tops of the peaks of the surface pro? NOTE 1—Optical microscope methods serve as a referee method for surface pro? Once the burnishing process is complete, the replica d4147 is removed from the surface and the image is measured using a spring-loaded micrometer.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.