MIL-STD-1622B(SH)
3.10 Critical applications. Critical applications are systems or components requiring more detailed cleanliness requirements than general applications because of unique operating parameters and environments. Air systems supplying diver life support and air systems supplying oxygen generating equipment are classified as critical applications because of the increased toxicity hazard associated with high partial pressure environments for diver air, and flammability due to the interface with the oxygen system for air systems supplying oxygen generating equipment.
3.11 Deballast air system. A deballast air system is a low pressure air system which is used for deballasting amphibious assault ships.
3.12 Dew point. Dew point is the measure of dryness or wetness of a gas. It is defined as the temperature at which gas becomes saturated with water vapor causing condensation when cooled at constant pressure. Dew point temperatures listed in this standard are at atmospheric pressure.
3.13 Dry air. Dry air refers to air that has been dried to a dew point temperature low enough to prevent condensation. The dew point is application specific, and is based on the maximum pressure and minimum temperature that
the application will normally experience. As an example, air that operates at
125 psig and is subjected to a 0oF operating environment would require a dew point temperature of about -35oF to prevent condensation.
3.14 Electronics dry air main. An electronics dry air main is that portion of the vital air main which is used for pressurization of various
types of radar waveguides and antennas, electronic equipment, and transmission systems.
3.15 Emergency breathing air system. Emergency breathing air systems distribute emergency breathing air throughout submarines and to specified pump rooms and machinery spaces on surface ships.
3.16 Final cleaner. A final cleaner is an aqueous cleaning solution or a cleaning solvent used for final flushing of piping systems or final
precision cleaning of components and parts.
3.17 General applications. General applications are systems or components not defined as a critical application.
3.18 Halogenated solvent. A halogenated solvent is any solvent whose chemical structure contains bromine, chlorine, fluorine, or iodine. Most halogenated solvents are non-flammable and many are very toxic. All NAVSEA approved halogenated solvents contain fluorine, some also contain chlorine, and none contain bromine or iodine.
3.19 High pressure air system. A high pressure air system is an air system which operates at pressures not less than 1000 lb/in2.
3.20 Low pressure air system. A low pressure air system is an air system which operates at pressures not greater than 150 lb/in2.
3.21 Maximum operating pressure. The maximum operating pressure is the highest pressure that can exist in a system or subsystem under normal (non- casualty) operating conditions. This pressure is determined by such
influences as pressure regulating valve set pressure, maximum pressure at the system source such as compressed gas bank pressure or sea pressure, and pump shut-off pressure for closed systems. For constant pressure systems, such as regulated compressed gas systems, the term Nominal Operating Pressure has been used to designate the steady state operating condition. Where this type of
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