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 I. Functions and associated symbols.

5.2 Hazards. Hazards shall be identified in accordance with 4.1.3. Letter sizes shall be the same as those used for function within the same identification group, with a 1/32 inch vertical space between words comprising a set, as in, a dual hazard, and a ¼ inch space between sets (or between words if only a single hazard is indicated). Where tapes are used to identify function,