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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The values given in parentheses are for information only. Therefore, differences are inevitable, particularly with deeper surface profiles, d441 the results may or may not fall within the specified range for one of the two methods.
Originally approved in Typically, the higher the coating thickness the greater the surface profile depth. Report the range of results from all locations as the surface pro? It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices asstm determine the applicability of regulatory limitations prior to use. Hold the gage by its base and press? This can be done with the unaided eye, under 5 to 10 power magni? The measurements must conform to the minimum and maximum surface profile requirements listed in the project specification.
Only the use of surface profile depth micrometers aetm replica tape were updated, and the specification changes are as follows: Models from a few gage manufacturers are available that conform to this standard. 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 c4417 measuring microscope.
For measurements that fall between e4417 sizes, it is still required that two readings using each tape are to be averaged to comprise one reading i. Standards for Measurement of Surface Profile.
Updates to ASTM D | American Galvanizer’s Association
The values given in parentheses are for information only. Authored by Alana Hochstein. Same Surface, Different Results? Work Item s – proposed revisions of this standard. Peak density the number of peaks per unit area also plays a key role in maintaining adhesion of the coating system and provides greater resistance to corrosion undercutting when the coating system gets damaged while in service.
The base of the instrument rests on the peaks of the surface profile while the cone-shaped point projects into the valley.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The information provided herein is not intended as a representation or warranty on the part of the AGA. ICS Number Code To avoid these discrepancies, it is recommended that a single method be employed on a project. Link to Active This link will always route to the current Active version of the standard. Anyone making use of this information assumes all liability arising from such use.
The material provided herein has been d44417 to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. The height of a single valley below a plane at the level of the highest surrounding peaks is measured with the? Precision and Bias 8.
atm Leave a Reply Cancel reply Your email address will not be published. How is Surface Profile Depth Quantified? This includes personalizing content and advertising. The three test methods described within D for measuring surface profile include visual comparators, surface profile depth micrometers, and replica tape. For this reason, surface profile should be measured prior to coating application to ensure that it meets that specified.
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.
Inspection Instruments Pipeline Coatings — Volume 2: Surface Profile Depth Micrometer – It is now required that the maximum individual reading of 10 or more surface asym readings per area are to be reported, rather than taking the average of ten readings per area. This method can be used to measure the surface profile depth that is created by abrasive blast cleaning or impact-type power tools.
Updates to ASTM D4417
Current edition approved May 10, Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Surface profile is defined as a measurement of the maximum peak-to-valley depth created by abrasive impingement against a surface during abrasive blast cleaning operations, or by an impact-type power tool.
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. 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 asym shown below.
Difference in Surface Profile Measurements: ASTM D Method B vs CKTA University
These changes reflect industry research on current tooling which revealed averaged measurements are consistently less than the values obtained using replica tape. This is done because of evidence that coatings performance in any one small area is primarily influenced by the highest surface features in that area and not by the average roughness. Because the results for the microscope and for the?
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: