Holiday detectors are used to inspect pipelines, processing plant equipment and other metal surfaces by being physically moved along the surface being inspected. They are used to evaluate properties such as protective coating thickness, cracks, and salt and moisture concentrations.7 sept 2017
Why is it called a holiday detector?
A holiday is a hole or void in the coating film which exposes the substrate to corrosion. The term holiday dates back to the days of wooden sailing ships. A sailor would seal the mast of the ship with tar to prevent the wood from rotting. If the sailor missed coating an area of the mast the wood would rot.
How do holiday detectors work?
The electrodes of these testing devices are composed of copper wires or carbon-embedded runners as opposed to sponges. Like low-voltage detectors, the high-voltage electrodes are swept over the coated surface. The presence of holidays completes the electrical circuit, which triggers the alarm on the indicator.3 sept 2020
How do you use a spy holiday detector?
https://www.youtube.com/watch?v=bvm0Rz2tI5s
What does a holiday detection test determine?
Holiday testing is a non-destructive test method applied on protective coatings to detect unacceptable discontinuities such as pinholes and voids. The test involves checking an electric circuit to see if current flows to complete the circuit.
Why is a holiday detector called a Jeep?
The term “jeep machine” is a nickname for a holiday detector, which is a hand-held device that corrosion control and prevention specialists use to nondestructively inspect coatings on pipe and other metallic objects.26 sept 2017
What is the purpose of holiday testing?
Holiday testing is a non-destructive inspection method used to detect unacceptable discontinuities (voids, pinholes, fisheyes, cratering, nicks, and sometimes weaknesses) in a non-conductive coating film which are not easily visible.12 ene 2021
How do you do a holiday test?
During holiday testing, a ground wire and probing electrode are attached to the same power source. The ground wire is clamped to the specimen being tested while the probe is swept across the surface of the metal substrate.3 sept 2020
How does a holiday test work?
Holidays tests work on the concept of electrical conductivity. ... During holiday testing, a ground wire and probing electrode are attached to the same power source. The ground wire is clamped to the specimen being tested while the probe is swept across the surface of the metal substrate.3 sept 2020
Why is it called a holiday test?
The term holiday dates back to the days of wooden sailing ships. A sailor would seal the mast of the ship with tar to prevent the wood from rotting. If the sailor missed coating an area of the mast the wood would rot.