Inspections of Existing Systems
Aging processes and atmospheric and operating influences have considerable effects on the reliability and efficiency of sprinkler units. This affects in particular the sprinklers and the pipe networks, which, during the regular inspections, may be subjected simply to a visual inspection from the outside.
For this reason, the valid guidelines specify that wet systems must be thoroughly inspected after 25 years and dry systems after 12.5 years. Apart from examining the inside of the pipe with an endoscope and determining the residual wall thickness by means of ultrasonic measurement, sprinklers are removed at random and subjected to functional testing in the VdS laboratories.