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

4.2 Identification media.

4.2.1 Tapes. Tape conforming to MIL-T-9906, and which completely encircles the line, shall be used to identify function of all lines, except lines exposed to excessive heat above 325°F (162.8°C) and lines in engine compartments, and fuel tanks or fuel cells where there is a possibility of the tape being drawn into the engine intake or fuel screen. Tapes used to identify function shall be color coded in accordance with 5.1.1.1; geometric symbols shall be printed thereon as specified in 5.1.2, and lettering shall be applied as specified in 5.1.3.1. Where the configuration does not permit application of tape, alternate identification methods such as tags on paint as described in this specification may be used.

4.2.2 Tags. The following lines should be identified by securely attaching applicable bands (see NAS 1411) or tags to the line as shown in figures 1, or 6.

a. Stainless steel lines 4 inches and larger in diameter.

b. Lines exposed to excessive heat above 325°F (162.8°C).

c. Cold lines, except that types may be used on cold lines as long as adhesion can be maintained at cryogenic temperatures and the lettering can be read from normal point of operation. Tags may be labeled on one side only. No geometric symbols need be painted on tags or bands. Tags and bands shall be impression stamped or electro-etched to show function, pressure if applicable, direction of flow if applicable, and applicable hazard(s), and need not be colored (see figures 1 and 6).

4.2.3 Paint. Suitable paints similar in hue, value, and chroma in accordance with FED- STD-595, and to the requirements specified in 5.1.1, and which have no deleterious effect upon the lines, shall be used for identification of:

a. Lines in engine compartments where there is a possibility of tapes, tags, or bands being drawn into the engine intake.

b. Lines 4 inches or larger in diameter except cold lines, hot lines, stainless steel lines, and lines in an oily environment.

4.2.4 Painted identification group. Whenever possible the painted identification group shall consist of (a) painted letters identifying the specific function, subsidiary function when required, working pressure if applicable, and the hazard(s) present, (b) colors denoting functions, and (c) a painted arrow indicating direction of flow if applicable. Stencils are suitable for paint application. Geometric symbols need not be used where identification is accomplished with paints. Carbon steel line and other lines requiring a protective finish will, in addition, be painted white, Color No. 17875, FED-STD-595, as background for the identification group. The white painted background will exceed the width of the identification group beyond both ends of the identification or to the ends of the lines whichever is shorter.