Materials Performance Supplements


Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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4 JUNE 2019 W W W.MATERIALSPERFORMANCE.COM CORROSION MANAGEMENT FOR PIPELINE INTEGRIT Y SUPPLEMENT TO MP Coatings and linings protect structural steel, concrete, and other materials from corrosion. To perform properly, they must be free of defects or discontinuities that expose the substrate beneath. Areas of thin or missing coating, called "pinholes" or "holidays", are often invisible to the naked eye, but can become foci for corrosion and drastically reduce the life of a protective coating system. DeFelsko manufactures both a low voltage pinhole detector and a high voltage holiday detector. Instrument selection depends on the thickness of the applied coating and the chosen test method. The PosiTest LPD Low Voltage Pinhole Detector is ideal for finding defects in coatings less than 500 microns (20 mils) thick by using voltages below 100 volts through a moistened sponge. For thicker coatings, the new PosiTest HHD High-Voltage Holiday Detector is the simple, durable, and accurate way to find defects in the coating system. Instead of a moistened sponge, a charged conductive brush or spring electrode is used. The lightweight and ergonomic PosiTest HHD uses pulse DC technology, offering a user-adjustable voltage range from 0.5 to 35 kV for detecting holidays, pinholes, and other discontinuities in coatings up to 20 mm (780 mils). The versatile PosiTest HHD is ideal for use with a wide range of quality electrodes, including steel rolling springs for pipes up to 2.4 meters (8 feet) in diameter and a range of brushes up to 1.2 meters (4 feet) in length—custom sizes are available upon request. All connectors are manufactured from stainless steel and aluminum to be corrosion resistant, strong, and lightweight, with no tools required for changing electrodes. Alter- natively, adaptors are available for connecting Tinker and Rasor and PCWI spring and brush electrodes. The PosiTest HHD is directly compatible with DeFelsko and SPY electrodes. The PosiTest HHD can be used in stick configuration right out-of-the box, or attach the optional wand accessory to convert to a shoul- der-carried configuration for inspecting hard-to-reach areas. The design and menu interface make holiday detection easy. The set voltage is displayed in the large, backlit display, and the icon- based menu can be accessed at the touch of a button to change set- tings such as the test voltage and alarm modes. The convenient volt- age calculator feature makes conforming to ASTM, NACE, ISO, and ACA standards simple, by automatically calculating a test voltage without the need for lookup tables or complex math. Lightweight, removable lithium-ion batteries provide lasting battery life. The smart battery technology features a built-in charge indicator, and lasts more than 40 hours on a single charge under typ- ical conditions. Even at the 35 kV setting and under maximum load, the PosiTest HHD can last through an 8-hour workday. The durable PosiTest HHD features a shock-absorbent housing purpose built for tough pipeline and manufacturing environments. It weighs less than four pounds and is designed to be comfortably used all day. More information, including a brief overview video, can be found at or call +1 315-393-4450 to speak with a technical sales representative. DeFelsko Corporation DeFelsko Corporation 800 Proctor Avenue Ogdensburg, NY 13669 Email: Tel: 1-800-448-3835 (USA) +1 315-393-4450 +1 315-393-8471 Web site: Holiday Detection with the New PosiTest HHD

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