MIL-STD-1622B(SH)
ENVIRONMENTAL PROTECTION AGENCY (EPA)
EPA-Method-1664 - N-Hexane Extractable Material (HEM) and Silica
Gel Treated N-Hexane Extractable Material (SGT-
HEM) by Extraction and Gravimetry (Oil and
Grease and Total Petroleum Hydrocarbons).
(Application for copies should be addressed to the Water Resource
Center, Mail Code RC-4100, 401 M Street, SW Washington, DC 20460.)
2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. DEFINITIONS
3.1 Air. Air refers to gaseous air as specified in 4.5.2.
3.2 Aqueous cleaning solution. An aqueous cleaning solution is a water based cleaner whose constituents are soluble inorganic compounds such as silicates or phosphates or soluble organic compounds such as non-ionic surfactant or combinations thereof. Examples of aqueous cleaning solutions include commercial detergents which generally contain both soluble inorganic and organic compounds and Navy Oxygen Cleaner (NOC) which contains only
soluble inorganic compounds.
3.3 Bleed air system. A bleed air system is a system in which air is supplied from the compression stage of a gas turbine generator or a propulsion gas turbine.
3.4 Blue line. When a cut for a pipe or fitting nears the inner wall, the outer surface turns blue which is referred to as cutting to the blue line. The blue line results from oxidation caused by the reduced ability of the thinned pipe or fitting to dissipate heat generated by the power tool cutting the surface.
3.5 Clean. Clean refers to the absence of scale, particulate, oil and grease contaminants at a level below that which adversely affects the operation or reliability of the component or system. The process of cleaning shall not affect the form, fit or function of the item being cleaned.
3.6 Cleaning solvent. A cleaning solvent is any material that exhibits the capability to dissolve other substances through chemical action and, for the purposes of this document, are 100% volatile. Examples include
halogenated solvents such as HFE-7100 which is non-flammable and hydrocarbon solvents such as isopropyl alcohol (IPA) which is very flammable.
3.7 Clean area. A clean area is an area that is free of air borne debris or contamination resulting from work accomplished in the immediate area.
3.8 Clean cloth. A clean cloth is used for local cleaning or wiping surfaces to evaluate loss of cleanliness. The cloth shall be adequately free of contaminants which could pose a compatibility, flammability, or toxicity hazard considering the specific application.
3.9 Components. Components refers to items such as valves, fittings, gauges and regulators in the systems.
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