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

and shall be 2 ± ¼ inches wide for lines 4 to 13 inches in diameter, 6 ± % inches for lines larger than 13 inches in diameter. The word group shall be applied as required to enable viewing from the normal point of operation or viewing.

5.1.2 Symbols. Solid black or, as an option, black outlined geometric symbols shall be printed on the tapes to denote functions as indicated in table I. Background shall be white or metallic (silvery or chrome). These symbols shall appear in a repeated pattern, as indicated in figure 2, for the entire length of the tapes. Symbols shall appear on the right-hand side of tapes and shall be approximately 3/16 inches wide and confined to the right of the tape within ¼ inch from the edge. Symbols may be omitted on bands, tags, or in painted identification.

5.1.3 Wording. Wording denoting function shall be the wording specified under function in table I, or as otherwise approved by the procuring activity.

5.1.3.1 Wording on tapes. Letters shall be 3/32 inch high, and shall be printed as shown in figures 1, 2, and 4. There shall be a 1/32 inch vertical space between words when more than one written line is required to complete a statement of function. Such statements shall normally recur at ¼ inch interval throughout the length of the tape. Lettering shall be black, regardless of the background color.

5.1.3.2 Wording on tags. Words indicating functions shall be the first word appearing at the top of the tag. Wording on tags shall be of such size as to be clearly legible and compatible to the diameter of the line.

5.1.3.3 Painted words. Letters shall be painted black on a white background, or they may be stenciled. Letters shall be of such size as to be clearly legible and compatible with the size of the lines. Words denoting function shall be the first words appearing in the identification.