Removing lines from various components throughout the system and then attempting to pressurize the system, causing a high rate of air flow through the system, does complete purging. The air flow will cause the foreign matter to be dislodged and blown from the system.

NOTE
If an excessive amount of foreign matter, particularly oil, is blown from any one system, the lines and components should be removed and cleaned or, in some cases, replaced.

In addition to monitoring the devices installed to remove contamination, it is your responsibility as a mechanic to control the contamination. You can do this by using the following maintenance practices:

Keep all tools and the work area in a clean, dirt-free condition.

Cap or plug all lines and fittings immediately after disconnecting them.

Replace all packing and gaskets during assembly procedures.

Connect all parts with care to avoid stripping metal slivers from threaded areas. Install and torque all fittings and lines according to applicable technical manuals.

Figure 3-55.- Demister (separator element).

POTENTIAL HAZARDS
All compressed gases are hazardous. Compressed air and nitrogen are neither poisonous nor flammable, but should be handled with care. Some pneumatic systems operate at pressures exceeding 3,000 psi. Lines and fittings have exploded, injuring personnel and property. Literally thousands of careless workers have blown dust or other harmful particles into their eyes by careless handling of compressed air outlets.

If you ever have to handle nitrogen gas, remember that it will not support life, and when released in a confined space, it will cause asphyxia (the loss of consciousness as a result of too little oxygen and too much carbon dioxide in the blood). Although compressed air and nitrogen seem safe in comparison with other gases, do not let overconfidence lead to personal injury.

SAFETY PRECAUTIONS
To minimize personal injury and equipment damage when using compressed gases, observe all

SAFETY PRECAUTIONS
To minimize personal injury and equipment damage when using compressed gases, observe all practical operating safety precautions, including the following:

Do NOT use compressed air to clean parts of your body or clothing or to perform general space cleanup instead of sweeping.

NEVER attempt to stop or repair a leak while the leaking portion is still under pressure. Always isolate. depressurize. and tag out the portion of the system to be repaired.

Avoid the application of heat to the air piping system or components, and avoid striking a sharp, heavy blow on any pressurized part of the piping system.

Avoid rapid operation of manual valves. The heat of compression caused by a sudden high-pressure flow into an empty line or vessel can cause an explosion if oil is present. Valves should be slowly cracked open until air flow is noted and should be kept in this position until pressures on both sides of the valve have equalized. The rate of pressure rise should be kept under 200 psi per second, if possible. Valves may then be opened fully.

Do NOT subject compressed gas cylinders to temperatures greater than 130 F. Remember, any pressurized system can be hazardous to your health if it is not maintained and operated carefully and safely.