Since the early days of the industrial gases industry, it has been recognized that maintaining cleanliness of components in contact with oxygen is essential to avoid ignition of components or systems. Oxygen is not flammable but supports and accelerates combustion of most materials used in oxygen systems. Recognition of oxygen's reactivity has led to stringent requirements for the cleanliness of equipment in oxygen service.
This publication has been prepared by a group of experts in industrial gases technology or oxygen equipment and is based on currently available technical information and experience. It provides knowledge on the cleaning, inspection, and packaging and handling of equipment used in oxygen service.
This publication describes the cleaning methods and requirements for equipment used in the production, storage, distribution, and use of liquid and gaseous oxygen to reduce the risk of fire, explosion, or promotion of combustion.
Cleaning in accordance with this publication is required for all surfaces in contact with a gas or liquid that has an oxygen concentration greater than 23.5%. Examples of such equipment include stationary storage tanks, road tankers, and rail cars; pressure vessels such as heat exchangers and distillation columns; compressors and pumps; and associated piping, valves, and instrumentation.
However, the cleaning methods and requirements are not limited to this equipment. With modifications, these methods may be used for cleaning other oxygen and oxidizer (e.g. fluorine, nitrogen trifluoride, nitrous oxide) service equipment such as cylinders, cylinder valves, cylinder regulators, welding torches, and pipelines where regulatory requirements do not specify cleaning methods.
This publication is intended for all personnel involved in the cleaning of equipment for oxygen service.
The publication is part of the programme to develop Globally Harmonised publications amongst Regional Gas Associations.