Holiday Testing Of Pipe

Cracks in the coating.

Holiday testing of pipe. Occasional checks of the detector operation should be made particularly if no holidays are being found. 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. These tools called holiday detectors are portable devices that are swept across the coated surface.

Holiday test for pipe holiday detector is suitable for all types of coatings like fusion bonded epoxy coal tar epoxy paints polyester polyurethane pipeline tapes heat shrinks and asphalt. Scope the holiday test is to be carried out for 100 of the wrapped and coated pipes using portable low amperage adjustable voltage and pulse type holiday detector employing an audible signalling device. Holidays also include other types of defects such as.

A holiday test is an inspection method used to detect discontinuities in painted coated surfaces using specialized tools and equipment. Introduction this covers the electrical test procedure that is adopted for checking whether there is continuous coating on the pipe surface. Holidays tests work on the concept of electrical conductivity.

High voltage testing of internal pipeline coatings internal pipe diameters do vary depending on the pipes wall thickness internal coating thickness may also play a part in the overall internal diameter. It is effective on films up to 0 508 mm 20 mils thickness if a wetting agent is used with the water. High voltage holiday testing of internal pipeline coating types of brushes to use inspection of pipeline coatings.

Holiday tester is versatile unit can be used to inspect protective coatings applied to pipelines tanks pilings fire lines or buried pipelines of conductive surface. 1 2 method a is designed to detect holidays such as pinholes and voids in thin film coatings from 0 025 to 0 254 mm 1 to 10 mils in thickness using ordinary tap water and an applied voltage of less than 100 v d c. D5162 15 standard practice for discontinuity holiday testing of nonconductive protective coating on metallic substrates discontinuities metallic substrate high voltage spark testers low voltage wet sponge non conductive protective coatings.

Insufficient or excessive film thickness it is very difficult to detect holidays such as pinholes discontinuities and improper bonding of protective coatings as it can t be done during the inspection unless sophisticated equipment is used. Holiday test or a continuity test is one of the non destructive test method applied on protective coatings to detect unacceptable discontinuities such as pin.