MIL-STD-1247D
3.9 Subfunction (also subsidiary function). The mechanical, operations or conditioning effects which result from the application of a function to a system or subsystem, causing the system or subsystem to perform its intended operation (as in "Flaps Up," "Flaps Down," heating or cooling and the like).
4. GENERAL REQUIREMENTS
4.1 Identification. Each line shall be identified as to function and subsidiary functions when required, applicable hazard and direction of flow if applicable, except as follows:
a. Water piping systems containing water for human consumption shall be painted white or identified as directed by the procuring activity.
b. There is no requirement to mark temporary lines or umbilical cables.
c. Tapes shall be used for normal operating temperature -60°F to +325°F (-51°C to
+162.8°C). However, where the use of tapes is not feasible due to temperature conditions, bands or tags impression stamped or electro-etched with function, pressure, hazard, and direction of flow as applicable, shall be used. Figures 1 and 6 illustrate band and tag acceptable for this purpose. Bands, tags, and tapes shall not be used in the engine compartments where there is a possibility of the bands, tags, or tapes being drawn into the engine intake. For such locations, paints conforming to this standard, and which has no deleterious effect on the material used for the lines, shall be used for identification purposes.
4.1.1 Identification of function. Function shall be identified by the use of words, colors, and symbols as shown in figure 2, except that symbols need not be used where identification is accomplished with paints, and neither colors nor symbols are required on tags or bands.
4.1.2 Identification of subsidiary function. If required for unique identification of a line, additional information relating to function of a line may be imprinted in words or abbreviations on the colored portion of the MIL-T-9906 tape, as shown in figure 4, metal tags as shown in figure 6, or bands as shown in figure 1.
4.1.3 Designation of hazards. Hazardous materials or conditions shall be designated in black letters on white or metallic (silvery or chrome) background as specified in 5.2 (see figure
1). Where such hazards result from working pressure only, and where the pressure is indicated in the identification, no further identification of hazard is necessary. Under conditions warranting special care over and above that required for the identified hazard, the skull and cross-bones symbol, illustrated in figure 3, shall be used.
4.1.4 Designation of direction of flow. When required, a direction of flow arrow, as shown in figures 1, 4, or 6 shall be used to indicate the direction in which the content of the line is flowing. A two-headed arrow will be used to indicate reversible flow.
4.1.5 Designation of pressure. Designation of pressure shall be as specified in 5.5.
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