MIL-STD-1330D(SH)
20 September 1996
3.17 Membrane filter. A membrane filter refers to an absolute rated filter where the filter retains all particles whose smallest dimension is equal to or greater than the specified rating.
3.18 Nitrogen. Nitrogen refers to gaseous nitrogen as specified in 4.7.3.
3.19 Objective quality evidence. Objective quality evidence is any statement of fact, either quantitative or qualitative, pertaining to the quality
of a product or service based on observations, measurements, or tests which can be verified. Evidence will be expressed in terms of specific quality requirements or characteristics. These characteristics are identified in drawings,
specifications, and other documents which describe the item, process, or procedure.
3.20 Organic. Organic refers to any chemical compound containing carbon. For the purposes of this document, the organic compounds of interest are hydrocarbon compounds containing carbon and hydrogen, and fluorocarbon compounds containing carbon and fluorine. Hydrocarbon materials such as lubricating oils are very flammable in oxygen, while fluorocarbon materials such as MIL-G-27617 grease demonstrate good compatibility with oxygen.
3.21 Oxygen clean. Oxygen clean is the verifiable absence of particulate, fiber, oil, grease, and other contaminants determined through the use of qualitative and quantitative cleanliness measurement techniques. An oxygen, helium, helium-oxygen, nitrogen, nitrogen-oxygen, or hydrogen piping system or component successfully cleaned in accordance with this standard is considered oxygen clean.
3.22 Oxygen enriched. Oxygen enriched refers to any fluid containing greater than 25 percent oxygen by volume in accordance with ASTM G 63 and ASTM G
94.
3.23 Precision cleaning. Precision cleaning is the act of removing unwanted contaminants to better than visibly clean. Precision cleaning is accomplished using a controlled and verifiable process with cleaning agents that satisfy the applicable cleanliness requirements.
3.24 Pre-cleaner. A pre-cleaner is any aqueous cleaning solution or cleaning solvent used to clean parts to visually clean. Examples include Navy oxygen cleaner (NOC), dissolved tribasic sodium phosphate (TSP), isopropyl alcohol, and non-ionic detergent (NID) mixed with water or NOC or TSP.
3.25 Sample. Sample is a representative amount of cleaning solvent, cleaning solution, rinse water, or pressurized gas collected in clean containers at selected locations obtained to verify the performance of the cleaning process.
3.26 Surfactant. A surfactant is a surface wetting agent which reduces interfacial tension between a liquid and a solid.
3.27 Validation. Validation is the demonstration of the ability to perform a technique or process with verifiable results at a regular interval.
3.28 Vendor. A vendor is any person not employed by the U.S. Navy that performs services as specified in this standard at a facility not owned or operated by the government.
3.29 Water. Water refers to water as specified in 4.2.
3.30 Wetted surface. A wetted surface is any surface that comes in direct contact with the system fluid.
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