CGA P-38 PDF

Cylinders are devalved for many purposes such as inspection, requalification, cylinder cleaning, change of service, installation of a new valve, or preparation for filling. Near misses, injuries, and fatalities have occurred during the devalving of cylinders that were pressurized. Uncontrolled release of gases to the environment, worker health and safety concerns from gas exposure, fires, and the catastrophic sudden release of energy have all been associated with devalving operations.

This publication identifies devalving hazards and provides guidance to prevent incidents.