Do not drag the instrument across the surface between readings, or the spring-loaded tip may become rounded leading to false readings. Last previous edition approved in as D — 93 Measure the thickness of the tape compressed foam and non-compressible plastic? Both the structure and the coating system protecting the structure will move while in service. 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. Current edition approved May 10,

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Work Item s – proposed revisions of this standard. Therefore, differences are astm d4417, particularly with deeper surface profiles, and the results may or may not fall within the specified range for one of the two methods.

Updates to ASTM D4417

October 18, Authored by Alana Hochstein. This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. 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 astm d4417.

Profile depth designations are based on the concept of mean maximum profile h max ; this value is determined by averaging a given number usually 20 of the highest peak to lowest valley measurements made in the field of view of a standard astm d4417 microscope.

Difference in Surface Profile Measurements: ASTM D Method B vs CKTA University

Subtract the thickness of the noncompressible plastic? Users of this standard are expressly advised that determination of the validity of any such astm d4417 rights, and the risk of infringement of such rights, are entirely their own responsibility. The standard does not address discarding outliers, but an update to the standard addressing outlier readings is planned.

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Authored by Alana 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. Each area is marked giving the nominal pro?

While both the depth micrometer and replica tape methods conform to ASTM D, the measurement acquisition principles are quite different. Same Surface, Different Results?

Updates to ASTM D | American Galvanizer’s Association

NOTE 1—Optical microscope methods serve as a referee method for surface pro? These changes reflect industry research on current tooling which revealed averaged measurements are consistently less than the values obtained using replica tape. According to ASTM D, a minimum of 10 readings is obtained per area; the maximum surface profile is reported discarding obvious outliers.

The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. Aztm each location make three readings and determine the mean. Atsm is astm d4417 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.

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. Typically, the higher the coating thickness the greater the surface profile depth. There are currently four primary standards for measurement of surface profile in steel surfaces. Your comments will receive careful consideration d44417 a meeting of the responsible technical committee,1which you may attend.


Leave this field empty. Today, Method B and Method C are the most commonly used, so that is what we will astm d4417 focusing on. The distance from the bottoms of many of the deepest valleys to the tops of the highest peaks xstm pro? Precision and Bias 8. For measurements that fall between tape sizes, it is astm d4417 required that two readings using each tape are to be averaged to comprise one reading i.


This can be done with the unaided eye, under 5 to 10 power magni? Astm d4417 the thickness of the tape compressed foam and non-compressible plastic?

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Larger repair areas or prepared hot-dip galvanized surfaces astm d4417 painting can be measured with 10 readings taken from a minimum of three, 6×6 inch 15×15 cm areas.

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.

What is Surface Profile and Why is it Necessary?