Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D This method will not, however, find any thin spots in the coating. This method will determine the existence of any gross faults in thin-film pipeline coatings. This method can be used to verify minimum coating thicknesses as well as voids in quality-control applications.
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ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. It is effective on? It should be noted, however, that this method will not detect thin spots in the coating, even those as thin as 0. This may be considered to be a nondestructive test because of the relatively low voltage. This method can be used on any thickness of pipeline coating and utilizes applied voltages between and 20 V d-c.
The values given in parentheses are for information only. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Referenced Documents 2. Terminology 3.
These are used on the coatings of relatively high-electrical resistance when such coatings are applied to the surface of materials of low-electrical resistance, such as steel pipe. Summary of Test Methods 4. This electrical contact will activate an alarm alerting the operator of the incidence of a holiday.
This method will not, however,? This method will determine the existence of any gross faults in thin-? This method can be used to verify minimum coating thicknesses as well as voids in quality-control applications. Current edition approved Sept. Published November Originally published as G 62 — Last previous edition G 62 — Apparatus 6.
A ground wire connects the detector with the low-resistance metal surface. Reagents and Materials 7. NOTE 1—Ordinary tap water will suffice to wet the sponge electrode when inspecting coatings up to 0. Then tighten the clamps with the screw until they are well down into the sponge electrode.
Attach the ground wire lead with battery clamp and the wand to the terminals. Clip the ground wire to some point where the metal surface is bare. Now touch the electrode to a second point where the surface is bare and note that the audible signal will be activated. The detector is now ready to operate by passing the damp sponge over the coated surface.
When a holiday is picked up by the audible alarm, the electrode can be turned on end and the exact spot of failure can be noted by searching with the tip of the electrode.
This is particularly important if formed surfaces are to be inspected. If the surface is in an environment where electrolytes might form on the surface, such as salt spray, wash the coated surface with fresh water and allow to dry before testing.
Take care to keep the electrolyte at least This type of holiday detector will not detect thin spots in pipeline coatings. Procedure for Method B NOTE 2—The dielectric breakdown voltage per millimetre mil can be determined for each coating experimentally as follows: Increase the holiday detector voltage over a known coating thickness and measure the voltage at the point where the detector will just begin to ring. Divide this voltage by the known coating thickness to obtain the amount of volts per millimetre mil.
Test Specimen 8. Standardization of Instruments 9. This is used more commonly with Method B where voltage may vary from test to test but can also be used for veri?
A common factory setting for sensitivity is V. Most units can be reset to any predetermined sensitivity value in this manner. Procedure for Method A Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend. Therefore, they are useful for testing voids, pinholes and thin spots in the coating, but would not be useful as a coating thickness quality control tool. Plug the ground wire into the holiday detector.
Plug the searching electrode into the holiday detector. Turn on the holiday detector. The detector will ring if it passes any void, pinhole, or area of the coating thinner than the minimum allowable thickness. When a holiday is detected by the audible alarm, the electrode can be repositioned to determine the exact holiday area by observing the origin of the spark jump. Dryness is critical in a high voltage test.
Take care to keep the electrode at least Report For polymeric precoated corrugated steel pipe, the reporting requirements of Speci? Precision Specimens that were not adjacent in the as-produced condition, or were taken from different lengths of pipe, may represent differing process conditions.
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Standard Test Methods for Holiday Detection in Pipeline Coatings
ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. It is effective on? It should be noted, however, that this method will not detect thin spots in the coating, even those as thin as 0. This may be considered to be a nondestructive test because of the relatively low voltage.
BS EN 3475-410:2002
Active view current version of standard. Other Historical Standards. Work Item s - proposed revisions of this standard. More D It is effective on films up to 0. It should be noted, however, that this method will not detect thin spots in the coating, even those as thin as 0. This may be considered to be a nondestructive test because of the relatively low voltage.