Chapter 1 - Safety Warnings
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MNL000294.doc
Revision 2
09/16/2016
Source System TE11
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Follow safe practices when using oxygen or oxidizers (chlorine and fluorine)
Oxygen concentrations in excess of 23% significantly increase the hazard exposure to personnel and
equipment. Those materials which burn in air will burn more violently and explosively in
oxygen/oxidizer enriched atmospheres. Guidelines for oxygen systems are found in CGA Pamphlet G-
4.4. (Contact your gas supplier or the Compressed Gas Association to order CGA Pamphlets.) Only
those personnel who have read and understand the hazards of oxygen or oxidizers and safe practices
for these systems should be permitted to operate and maintain the system.
Use only equipment specifically designed for oxygen or oxidizer service.
Inappropriate materials of construction increase the danger of ignition of pipelines and controls. Pipe
sizing is just as important to ensure all velocity restrictions for oxygen or oxidizers are met. Do not
substitute components or equipment without considering these hazards. Refer to CGA Pamphlet G-4.4
for guidelines and specifications of oxygen systems. (Contact your gas supplier or the Compressed
Gas Association to order CGA Pamphlets.)
Maintain oxygen cleanliness at all times.
All equipment and piping in contact with oxygen or oxidizers must be cleaned to specifications
outlined in CGA Pamphlet G-4.1. (Contact your gas supplier or the Compressed Gas Association to
order CGA Pamphlets.) Failure to clean components and piping increases the danger of ignition and
fire. Note that the cleaning solvent must be thoroughly removed before the equipment can be placed
into service. Maintain cleanliness during assembly, installation, and repair.
No open flames, smoking, or sparks permitted near oxygen equipment.
Since many materials will burn in oxygen/oxidizer enriched atmospheres, the best method in
preventing fires is to eliminate sources of ignition. Where this control equipment is being used or
where concentrations of oxygen are greater than 23%, avoid open flames, sparks, or sources of heat.
Never weld on a pressurized line flowing oxygen or an oxidizer. Make sure signs are posted warning
personnel that oxygen or oxidizers are in use.
Do not substitute oxygen for compressed air.
Substituting oxygen for compressed air is dangerous.
Explosions can occur when oxygen is
substituted for air.
Chances are the instrument air equipment is not compatible or cleaned for oxygen
service. Oxygen used to clean off equipment or clothing could come in contact with a source of
ignition (spark, flame, or other) and ignite. In some cases, the elevated oxygen levels could linger
even after the source has been shut off. Never tie into an oxygen system for personal breathing
purposes.