MIL-STD-1330D(SH)
20 September 1996
3.5 Cleanliness level. A cleanliness level is an established maximum allowable distribution of contamination of a given size and quantity in a specified area or volume.
3.6 Clean lint-free cloth. A clean lint-free cloth in accordance with
MIL-C-24671, or equal, is used for local cleaning or wiping surfaces to evaluate
loss of cleanliness. The cloth should be free of chemicals which could pose a
compatibility, flammability, or toxicity hazard considering the specific
application.
3.7 Cleanroom. A cleanroom is a permanent area where a high degree of cleanliness is continuously achieved by employing varying degrees of control and monitoring of environmental items such as ventilation, filtration, temperature, humidity, pressure, personnel, clothing, and room maintenance. Refer to 5.1 for cleanroom requirements.
3.8 Components. Components refers to items such as valves, fittings, gauges, regulators, and repair parts in the systems.
3.9 Contractor. A contractor is any person not employed by the U.S. Navy performing services on-board ships or at shore base facilities on components or systems defined by 1.2.
3.10 Controlled area. A controlled area is an area where a high degree of cleanliness is temporarily achieved and maintained by the use of temporary boundaries, air filtration, and the enforcement of strict controls on personnel access, operations, and area maintenance. Controlled areas are most often used for in-place maintenance and repair of shipboard systems. Refer to 5.1 for controlled area requirements.
3.11 Critical applications. Critical applications are systems or components requiring more detailed cleanliness and packaging requirements than generally specified because of unique operating parameters and environments. In the past, some saturated diving systems have been classified as critical applications
because of the increased toxicity hazard associated with high partial pressure environments. Unless directed by NAVSEA or the Type Commander, critical requirements may not be used.
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 temperature is measured at atmospheric pressure.
3.13 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.
3.14 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.
3.15 Helium. Helium refers to gaseous helium as specified in 4.7.2.
3.16 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 or compressor 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 pressure
rating is applied, for the purpose of the requirements stated herein, it may be substituted as the maximum operating pressure.
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