AMPP Store - Products tagged with 'voltage'

Available for download

ACVG or DCVG - Does it Matter?

Product Number: 51317--9374-SG

ISBN: 9374 2017 CP

Author: Jim Walton

Publication Date: 2017

$20.00

This paper will point out when and why to use either Direct Current Voltage Gradient (DCVG) or Alternating Current Voltage Gradient (ACVG) surveys, including what the criteria of percent IR and Decibel microvolt (dBµV) really mean when conducting these survey techniques.

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An Overview of Significant Updates to High Voltage Holiday Detection Standards (NACE SP0188/SP0274/SP0490, ASTM D5612/G62, ISO 29601)

Product Number: 51324-21164-SG

Author: Michael Beamish; Lake Barrett

Publication Date: 2024

$40.00

High Voltage Holiday Detectors are commonly used to locate pinholes in coatings by generating a spark when an electrode passes over an area of bare substrate. Pinholes and areas of a non-continuous coating film can provide a direct path for premature failure of the coated asset. Historically a rule of thumb across the coating industry had been to utilize 100 volts per mil of coating as the recommended voltage setting for holiday detection. A paper presented at a recent AMPP conference1 provided compelling evidence, and confirmed industry suspicions, that the rule of thumb and test voltages specified by nearly every published standard were inadequate to reliably detect all holidays. In response, industry stakeholders worked to build consensus and update the relevant standards with science-based and experimentally-proven specifications that help ensure High Voltage Holiday Detectors are used appropriately, and with the correct voltage settings, to reliably detect holidays. This paper provides a review of these updates.

Available for download

Interaction of a Faulty AC Power Conditioning Capacitor Bank with Welded Steel Pipeline

Product Number: 51321-16221-SG

Author: Cal Chapman, P. E.

Publication Date: 2021

$20.00

Available for download

Why Voltage Matters For High Voltage Holiday Testing On Steel

Product Number: 51322-17662-SG

Author: Cameron Walker, Vaughn O’Dea, Joshua Bell, Javier Tormes

Publication Date: 2022

$20.00

A holiday is defined as a pinhole or discontinuity in a coating lining. These discontinuities are frequently very small and not readily visible and create a pathway for oxygen and an electrolyte to cause deterioration of the underlying substrate. These defects will tend to reduce the life expectancy of a coating in service, particularly if the service is to include immersion, such as the lining of a tank or a pipe.

Products tagged with 'voltage'

ACVG or DCVG - Does it Matter?

An Overview of Significant Updates to High Voltage Holiday Detection Standards (NACE SP0188/SP0274/SP0490, ASTM D5612/G62, ISO 29601)

Interaction of a Faulty AC Power Conditioning Capacitor Bank with Welded Steel Pipeline

Why Voltage Matters For High Voltage Holiday Testing On Steel

Association for Materials Protection and Performance