Spark Testing or Holiday Test

Spark Test or Holiday Test


Holiday test or a Continuity test is one of the non destructive test method applied on protective coatings to detect unacceptable discontinuities such as pinholes and voids.

The test involves checking of an electric circuit to see if current flows to complete the electrical circuit.

A Holiday test or Continuity test is performed by applying low voltage (connected in series with an LED or noise-producing component such as a piezoelectric speaker) across the chosen path.

If the electrical flow is detected then the test area is termed as conductive indicating presence of discontinuities such as pinholes and voids.

This test is commonly used in the offshore industries where piping and structures are coated with non-conductor coatings.

Source : lmats

1. Scope

1.1 This practice covers procedures for determining discontinuities using two types of test equipment:

1.1.1 Test Method A—Low Voltage Wet Sponge, and

1.1.2 Test Method B—High Voltage Spark Testers.

1.2 This practice addresses metallic substrates. For concrete surfaces, refer to Practice D 4787.

1.3 The values stated in SI units are to re regarded as the standard. The values given in parentheses immediately following the metric units are for information only.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.