Acoustic water leak detection
When water escapes pipework under pressure from a pin hole, cut, rupture or blow out dynamic isolated changes are taking place.
The escaping energy (water under pressure) forces its way through the fault which aggravates the opening causing vibrations or structure borne sound and as the water impacts the surrounding materials the pipework is buried or imbedded in such as sand, gravel, limestone, clay, bricks or other services the turbulence from the pressurised water causes vibration and sound waves. This is where acoustic or listening equipment can be used by water leak detectors.
Acoustic water leak detector using a Manual listening stick
Listening sticks have been used for centuries as a method of water leak locating. Very simple tool to use as the end of the rod is placed at the desired test location, with your ear resting on the ear piece while probing along the known route of the pipeline. Generally a listening stick is fabricated with a steel rod and ear piece made from either solid wood, nylon, plastic or with a diaphragm. Below pictures is a listening stick with diaphragm.