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Standard Test Methods for Holiday Detection in Pipeline Coatings1 This standard is issued under the fixed designation G62; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. Scope 2. Referenced Documents 1. Terminology 1 to 10 mils in thickness using ordinary tap water and an 3. It is effective on films 3. It should be noted, however, that this method precoated corrugated steel pipe.
This may be considered to be a nonde- structive test because of the relatively low voltage. This method can be used on any thickness of resistance when such coatings are applied to the surface of pipeline coating and utilizes applied voltages between and materials of low-electrical resistance, such as steel pipe. The values given in 4. Summary of Test Methods parentheses are for information only. It is the the coating. This electrical contact will activate an alarm responsibility of the user of this standard to establish appro- alerting the operator of the incidence of a holiday.
Published June Originally approved in Last previous edition approved in as G62 DOI: 3 Other manufacturers holiday detectors can be Standards volume information, refer to the standards Document Summary page on expected to have similar voltage specifications. No further reproductions authorized. G62 07 through the coating. This method will not, however, find any a selected resistance, having a 12 W rating, is placed across its thin spots in the coating.
This method will determine the terminals. A common factory setting for sensitivity is existence of any gross faults in thin-film pipeline coatings. Most units can be reset to any predetermined sensitivity 5. Procedure for Method A the coating, and thin spots in pipeline coatings. This method can be used to verify minimum coating thicknesses as well as Apparatus metal surface.
Then tighten the clamps with the screw sponge dampened with an electrically conductive liquid such until they are well down into the sponge electrode. Attach the as tap water; and an audio indicator to signal a defect in a ground wire lead with battery clamp and the wand to the high-electrical resistance coating on a metal substrate.
A terminals. Clip the ground wire to some point where the metal ground wire connects the detector with the low-resistance surface is bare.
Now touch the electrode to a second point metal surface. The detector is now ready to operate by passing ter having an electrical energy source of to 20 V d-c; the damp sponge over the coated surface. When a holiday is an exploring electrode consisting of wire brush, coil-spring, or picked up by the audible alarm, the electrode can be turned on conductive silicon electrode capable of moving along the end and the exact spot of failure can be noted by searching with pipeline coating; and an audio indicator to signal a defect in a the tip of the electrode.
V d-c, measured between the electrode sponge and the coated 6. This is particularly important if formed surfaces 7. Reagents and Materials are to be inspected. If the surface is in an environment where electrolytes might form on the surface, such as salt spray, wash 7. Take care to keep the electrolyte at least On films in. This type of holiday detector will not detect thin 8. Test Specimen spots in pipeline coatings.
Procedure for Method B pipe. Standardization of Instruments This is used more commonly with Method B where voltage may vary NOTE 2The dielectric breakdown voltage per millimetre mil can be determined for each coating experimentally as follows: Increase the from test to test but can also be used for verification of the holiday detector voltage over a known coating thickness and measure the voltage on a Method A test. Divide this 9.
This can also be obtained from most coating manufac- with respect to sensitivity by having the alarm activated when turers literature. Your comments will receive careful consider- G62 07 Dryness is critical in a high voltage test. Therefore, they are useful for testing voids, and 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. Then make up the searching electrode Precision and Bias in accordance with the manufacturers recommendations, using a brush wire or conductive silicon electrode. Plug the searching Turn on the holiday from the production-coated pipe as for the polymeric corru- detector. Specimens that were not adjacent in the as-produced at the same time if the instrument is on. The detector will ring if it Keywords instruments, set at the same voltage, inspecting the same No value for bias can be determined.
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Is this content inappropriate? Report this Document. Flag for Inappropriate Content. Download Now. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Designation: G62 07 Reapproved Standard Test Methods for Holiday Detection in Pipeline Coatings1 This standard is issued under the fixed designation G62; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
G62 07 FIG. Syed Zakiuddin. James Ortega. Mawlood Al Ameri. Mohamed Farouk. David Aliaga Sayas. Allen Situ. Sorelis Colmenarez Ochoa. Guha Arnab. Venkat Gokila DT. Charlie Duke. Moito Carvalho. Ali Awead.
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.
PCWI Wet Sponge Pinhole Detector
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.
ASTM G62 - 07