MIL-STD-1622B(SH)
pressure rating is applied, for the purpose of the requirements stated herein, it may be substituted as the maximum operating pressure.
3.22 Medium pressure air system. A medium pressure air system is an air system which operates at pressures greater than 150 lb/in2 and not greater than 1000 lb/in2.
3.23 Nitrogen. Nitrogen refers to gaseous nitrogen as specified in
4.5.3.
3.24 Non-vital air main. A non-vital air main is that portion of the ship service low pressure air system which serves other than vital users.
3.25 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. Examples of hydrocarbon materials include most fuels and compressor lubricating oils, while examples of fluorocarbon materials include MIL-G-27617 grease used for lubricating high pressure o-rings.
3.26 Precleaner. A precleaner is any aqueous cleaning solution or cleaning solvent used to initially clean parts to visually clean. Examples include Navy Oxygen Cleaner (NOC), dissolved tribasic sodium phosphate (TSP), isopropyl alcohol (IPA), and non-ionic detergent (NID) mixed with water.
3.27 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.
3.28 Surfactant. A surfactant is a surface wetting agent which reduces interfacial tension between a liquid and a solid.
3.29 Vital air main. A vital air main is that portion of the ship service low pressure air system which serves users whose continuous operation is essential for safety and mission capability of the ship.
3.30 Water. Water refers to water as specified in 4.1.
4. GENERAL REQUIREMENTS
4.1 Water.
4.1.1 Applicability. Three grades of water, A, B, and C, in descending order of purity, are associated with preparing and diluting cleaning
solutions, flushing, rinsing, and testing, and are defined in Table I. Water purity requirements specified throughout this standard are minimum requirements and do not preclude the use of water of greater purity.
4.1.2 Disposal. Disposal of water shall be in accordance with local, state, and federal regulations.
4.1.3 Compatibility. Appendix A gives the compatibility of hot water with various materials. Where incompatibility exists, process changes such as rinsing with cooler water, shorter rinse durations, or immediate drying of wet surfaces may need to be considered. Where specific information is lacking, perform compatibility testing as specified in A.3 of Appendix A.
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