Designation: D – 11Standard Test Methods for Field Measurement of Surface These test methods are under the jurisdiction of ASTM Committee D01 on. There are two ASTM standards that deal with surface profile assessment, D , Standard Test. Methods for Field Measurement of Surface Profile of Blast. 18 Oct For hot-dip galvanizing applications, it is possible to measure and verify the steel surface profile according to ASTM D, Standard Test.
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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. The base of the instrument rests on the peaks of the surface profile astm d 4417 the cone-shaped point projects into the valley.
Models from a few gage manufacturers are available that conform to this standard. There are currently four primary standards for measurement of surface profile in steel surfaces.
The standard does not address astm d 4417 outliers, but an update to the standard addressing outlier readings is planned. Link to Active This link will always route to the current Active version of the standard. 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 dd within the same area i.
What is Surface Profile and Astm d 4417 is it Necessary? Authored by Alana Hochstein. The surface profile must be astm d 4417 with the astm d 4417 system.
Leave this field empty. Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are as follows: For this reason, surface profile should be measured prior to coating application to ensure that it meets that specified. Visual Comparator – This test method, as well as the comparator discs axtm on the market, have stayed the same, and therefore there were no updates for this test method.
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. The creation of this peak-valley pattern in the surface effectively increases the surface area, providing an anchor for the coating system. Typically, astm d 4417 higher the coating thickness the greater the surface profile depth.
Today, Method B and Method C are the most commonly used, so that is what we will be focusing on. It is the responsibility of whoever uses this standard astm d 4417 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Historical Version s – astm d 4417 previous versions of standard. The depth is displayed on the gage in mils 0. The measurements must conform to the minimum and maximum surface profile requirements listed in the project specification. Larger 417 areas or prepared hot-dip galvanized surfaces for painting can be measured with 10 readings taken from a minimum astm d 4417 three, 6×6 inch 15×15 cm areas.
Save my name, email, and v in this browser for the next time I comment. According to ASTM D, a minimum of 10 readings is obtained per area; the maximum surface profile is reported discarding obvious outliers.
Updates to ASTM D4417
As a result, only two readings per area are now required to be averaged to obtain one measurement, instead of the three readings previously required. Standards for Measurement of Surface Profile. The values given in parentheses are for information only. Leave a Reply Cancel reply Your email address will not be published. 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.
For more information related to surface preparation as astm d 4417 relates to awtm galvanized steel, you astm d 4417 contact AGA Corrosion Engineer Alana Hochstein at ahochstein galvanizeit.
Updates to ASTM D | American Galvanizer’s Association
Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are astm d 4417 follows:.
S 1 — Optical microscope methods serve as a referee method for surface profile measurement methods A and B.
Surface profile is defined as a measurement of the zstm peak-to-valley depth created by abrasive impingement against a surface astm d 4417 abrasive blast cleaning operations, or by an impact-type power tool.
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.