A hydraulic test is a procedure used to assess the integrity and leak-tightness of pressure vessels, pipelines, and other fluid-containing systems. The process involves filling the vessel or pipeline with water, which is nearly incompressible, and then increasing the internal pressure to a specified level above its normal operating pressure. This allows inspectors to check for leaks, deformations, or weaknesses in the structure without the risk of explosive failure, as water does not expand rapidly like gases. Hydraulic testing is a crucial safety measure in industries such as oil and gas, chemical processing, and power generation, ensuring that equipment can safely withstand operational pressures. Regular hydraulic tests are often mandated by safety regulations and standards to prevent accidents and maintain system reliability.