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

identification of hazard may be accomplished with tape(s) of ½ inch minimum width. When painted or appearing on tags or bands the hazard shall be the last word(s) in the identification following the direction of flow arrow, if applicable. Hazards associated with various line contents shall be in accordance with primary and secondary warning designations as established in MIL-STD-101. However, for application under this standard, words and abbreviations are to be substituted for colors to identify specific classes of hazards as indicated under "Identification Marking", (see table II). To facilitate cross-referencing, MIL-STD-101 colors applicable to all

hazards are indicated opposite the identification markings. Thus it will only be necessary to refer to the color shown in table II of MIL-STD-101 for a particular content, then substitute applicable words or abbreviations.

5.3 Direction of flow. Direction of flow shall be identified by the arrow symbol as specified in 4.1.4.

5.4 Tapes. Where function is identified by tape, the direction of flow symbol shall appear on tapes that completely encircle the line. Arrows shall be printed in a recurring pattern at ¼ inch intervals. Tapes shall be ½ inch wide minimum, and the arrow shall extend to within 1/32 inch of each edge. Height of arrow heads shall be 3/32 inch maximum or as shown in figure 4.

5.4.1 Tags. The arrow shall be stamped or etched on metal tags and of such size as to be compatible with the letters.

5.4.2 Paints. Where identification is accomplished by painting the line, the size as to the arrow shall be compatible with the size of the letters.

5.5 Working pressure. When necessary, the pressure shall be shown in pounds (force) per square inch, i.e., 150 PSI. On tags and painted bands, pressure identification shall appear immediately beneath function, and letter size shall be same as employed for function within the same identification group. Where function is identified with tapes, pressure may be identified with tapes, ½ inch minimum width, using the same size letters and figures as those appearing on associated tapes. Lettering shall be black on a white or metallic (silvery or chrome) background.

5.6 Miscellaneous lines.