Hydrostatic testing is an important process that uses water to test for leaks in pressure vessels, fire hoses, sprinkler systems, fire extinguishers, boilers, water meters, plumbing lines, and solar systems. The process involves placing water under pressure, inside the vessel that is to be tested to ensure that it will not leak or be damaged. Usually a given vessel will be tested above its recommended pressure setting, approximately 166%, in order to simulate extreme conditions and give a margin of safety.