The terms holiday datce book to the days of the great wooden milling ships,
during the long slow voyages, ship maintenance was a must. one of the most
important duties was that of the Sailor, a Sailor would seal the must of the ship with tar to prevent the wood from rotting if the Sailor missed coating us area of the must the wood would rot it was said, the mailer must have taken a holiday at that point thus not achieving a good
coat of tar on the must later us stood replaced wood, point replaced tar however
holidays live on. Holiday also known as pinhole detector, voids, Discontinuities
Applications: Holiday Detector is an instrument used to detect holes in anti-corrosive coating (Electrically Insulated) on metallic pipes/surfaces . This test is carried before the pipes are laid underground.
Working Principle: The pipe is connected to earth (Nominal) and an electrode , charged to high tension , is moved over the coating at the place of a hole , arcing takes place and the instrument given alarm .