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Coatings Inspection Instruments: A PaintSquare Video Education Series

Presented by KTA-Tator

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Holiday Detection

William Corbett of KTA discusses Holiday Detection.

Tagged categories: Coating Application; KTA-Tator; PaintSquare; Quality Control; Surface Preparation

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Tagged categories: Coating Application; KTA-Tator; PaintSquare; Quality Control; Surface Preparation


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George Quigley, 10/8/2015, 2:38 PM

 we are reading holidays on our tanks with an expoxy powder, but it is over a zinc primer. If I get a fail is the reading topcoat to zinc primer or topcoat to substrate. Also when we apply hardware to attach the lid to the tank we cut the paint in the hole. This creates a fail if we touch the bolt or nut. Is this out of the range that the test was made for or is there any way to protect thehole from scratch or cut from torqued bolt installation that you have heard of?

sami hagag, 1/28/2015, 2:53 AM

Thank you for the video Mr. Corbett.

OM PRAKASH JAT, 1/23/2015, 1:28 PM

Holiday detection test is very interesting and easy to do. low voltage holiday test as per SSPC SP0188. when testing move the electrode at a rate of 01 ft/s in a single pass. surface must be free from dust and any foreign material. moving probe too quickly may miss a void. moving too slowly may create damage at thin spots or prove to be more exacting than was intended by the specifier. when the voltage is set too high the coating may be damaged. the same damage can occur if the coating is tested before it has released all or most of its solvent content. once a spark generates through the coating to the substrate, a specific holiday now exists even if there was no pinhole or break in the coating before the test was performed. Thanks.

Matthew Fajt, 1/22/2015, 10:56 AM

Most manufacturer's will supply a volt meter at an additional cost Mr. Corbett.

William Corbett, 1/22/2015, 9:43 AM

Holiday detectors cannot be calibrated on-site, but rather by the manufacturer of the detector. However, for high voltage detectors the voltage output of the detector can be verified using a peak volt meter. Most manufacturers of holiday detectors also supply a peak volt meter. Specific models of low voltage (wetted sponge) detectors allow verification of voltage output, and some can be adjusted; however they cannot be "field calibrated."

prasenjit kunti, 1/18/2015, 1:42 AM

how holiday detector calibrated in site

Cristiano Godoy, 9/30/2014, 5:28 PM

Thank you for the video Mr. Corbett.

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