MIL-STD-1247 Markings, Functions And Hazards Designations Of Hose, Pipe, And Tube Lines For Aircraft Missile, And Space SystemsThis standard establishes material labeling requirements for identification, function, subfunction, pressures, hazards and direction of flow for pipes, hoses and tube lines used in aircraft, missile, space systems, and support equipment. The use of colors, words and symbols to identify the functions of such items to include approved abbreviations, and the dimensions of labeling items such as tags, tapes, and bands, are specifically prescribed see 4.1.1.

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MIL-STD-1247D

TABLE II. Classification of hazards, identification marking, and corresponding MIL-STD-101 color.

Class of Hazard	Identification Marking	MIL-STD-101 Color
Flammable materials. All materials known ordinarily as flammable or combustibles.	FLAM	Yellow
Toxic and poisonous materials. All materials extremely hazardous to life or health, under normal conditions, as toxics or poisons.	TOXIC	Brown
Anesthetics and harmful materials. All materials productive of anesthetic vapors and all liquid chemicals and compounds hazardous to life and property but not normally productive of dangerous quantities of fumes of vapors.	AAHM	Blue
Oxidizing materials. All materials which readily furnish oxygen for combustion and fire producers which react explosively or with evolution of heat in contact with any other materials.	OXYM	Green
Physically dangerous materials. All materials, not dangerous in themselves, which are asphyxiating in confined areas or which are generally handled in a dangerous physical state of pressure or temperature.	PHDAN	Gray
Fire protection materials. All materials provided in piping systems or in compressed gas cylinders exclusively for use in fire protection.	FPM	Red

5.6.1 Electrical conduit. In addition to the primary functional identification consisting of "ELECTRICAL CONDUIT" and associated symbol, all wire-carrying conduits will bear two markings (see figure 5) to indicate (1) usage, as in POWER, CONTROL, COMMUNICATIONS, and the like, and (2) the maximum voltage and type normally encountered, as in "115V 60 CYCLE AC," "28 VDC," and the like. Conduit carrying a number of different wires serving different purposes shall be marked "ELECTRICAL CONDUIT" (including symbol if on tapes) only. However, those conduits which include power lines and which may constitute a hazard to operating personnel shall be marked to indicate the maximum voltage normally encountered.

5.6.2 Air conditioning ducts. Lines less than 30 inches outside circumferential measurement shall be identified with the air conditioning tape shown in figure 2. Lines with