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

circumferential measurements larger than 30 inches shall be painted with the largest sign the space will accept, not to exceed 12 inches by 12 inches. The sign shall be lettered in black on a white background with 1 ½ inch letters reading "AIR CONDITIONING" in two lines.

5.6.3 Vents, fills, and drains. All lines venting to the outside atmosphere, or used as fill or drain shall, in addition to required identification, be marked "VENT", "FILL", "DRAIN", "FILL OR DRAIN", and the like, as applicable. Such marking shall be black on a white or metallic (silvery or chrome) background on a subsidiary tape, tag, or painted as appropriate. The pressure at which the gas or liquid is vented will be shown. Dimensions and letter sizes shall substantially conform to those of the associated identification.

5.6.4 Flex hose. Rubber hoses and other types of flexible hoses used to transfer chemical neutralizers in the process of cleaning equipment, such as engines, shall carry appropriate function content, hazard and direction of flow identification in accordance with the requirements stated herein.

5.7 Placement of identification.

5.7.1 Placement of tapes. Function tapes shall be placed on both ends of a line 24 inches and longer, as near to the end as practical. Only one identification group shall be required on these lines. Where tube bends and table support location prevent subfunction tape application, only a primary system function tape need be required. Identification within a group shall be a minimum of 1/32 inch apart. Tapes are not required on hoses as long as the functional identification is defined and visible on adjacent lines or components.

5.7.2 Placement of bands, tags and paints. Metal tags, bands, and painted bands shall be located adjacent to all operating accessories described in 5.7.1, but bands and tags shall not be so near to as obstruct operations. In addition, identification will be located adjacent to the junction with branch lines, or where lines pass through walls or floors. In long corridors or tunnels, identification need only be placed at each end of the corridor or tunnel. Pipes circumscribing missile silo walls need be marked only once in each quadrant. In general, identification need by placed only at intervals to insure that at least one group is visible and recognizable from any observation point along the line.

5.7.3 Facility interface. System applications conforming to this standard must interface with facility systems piping coded in accordance with MIL-STD-101. The facility service points shall be in accordance with MIL-STD-2161, or as otherwise approved by the procuring activity.