In cylinder requalification, what does the volumetric expansion method involve?

The volumetric expansion method in cylinder requalification involves conducting a water jacket hydrostatic test. This method assesses the ability of the cylinder to withstand pressure by filling it with water and measuring any expansion that occurs as the cylinder is pressurized. During this test, if any deformation or leaks are detected, the cylinder is deemed unfit for continued use. This hydrostatic testing process is crucial for ensuring the safety and integrity of LP gas cylinders, as it directly measures the structural capability of the cylinder under pressure.

While visual inspections are important for identifying any obvious damage, they do not provide a numerical assessment of pressure capability as the hydrostatic test does. Similarly, measuring the liquid volume or checking weld integrity are relevant processes, but they do not specifically align with the volumetric expansion method used for cylinder requalification. The primary focus of this method is on how the cylinder behaves under pressure, which is effectively determined through hydrostatic testing.