Leaks in oxygen lines and be detected by painting oxygen tubing with a paintbrush and solution of soap suds--soap bubbles appear at the site of leak.
Connection of oxygen tubing to nipples, elbows, tees, and regulators are made air-tight by applying an anti-sieze, sealing compound to the pipe threads (see note, page 27). DON'T use anything containing OIL.
A good way to check entire oxygen system for a leak is to have systems charged to 450 pounds the night before take-off. If the pressure is less than 400 pounds the next morning a leak is present.
NOTE:
A 50 pound drop in pressure can be anticipated due to cooling off of oxygen after the system is charged.
GENERAL RULES FOR SAFE HANDLING OF OXYGEN
DON'T use oil with oxygen. The reaction when these two substances come in contact is more violent than igniting dynamite. Keep oil or grease away from oxygen cylinders, cylinder valves, and other equipment. Clean hands of oil or grease before using oxygen apparatus.
DON'T wear greasy clothes, gloves, etc., when working with oxygen. Oxygen will cause substances with merely a trace of oil or grease thereon to burn with great intensity.
DON'T use inflammable substances near oxygen. Oxygen itself will not burn but will greatly accelerate combustion.
PASSING OUT AT ALTITUDE