MIL---STD---101C
5.1.2 Use of colors. The appearance of any of the six colors specified in 4.2 on a piping system shall provide a warning of danger from the hazard involved in the system according to the defini- tions for warning colors specified therein. Piping systems which do not require warning colors may be painted to match surrounding, if not in conflict with other color designations in this standard or such systems be painted aluminum, black, or remain unpainted.
5.1.3 Primary color warning.
5.1.3.1 Use and application. A primary color warning shall appear on all dangerous piping sys- tems and on all fire protection materials in any installation which is color coded in accordance with this standard. Primary color warnings shall consist of a single color applied as a band or bands which completely encircle the piping system. Color bands shall be applied in conformance with dimensional information shown on figure 1. In lieu of color bands, all pipe and covering on an entire system, including all encircling or partially encircling straps, hangers, and supports, be painted with the primary color warning. However, the use of color bands is preferred because they will indicate dangerous systems to color---blind personnel.
5.1.3.2 Location on piping systems. Immediately adjacent to all operating accessories such as valves, regulators, flowchecks, strainers, cleanouts, pumps, dispensing points, and vents, all coded piping systems shall be painted with a primary color warning. In addition, primary color warnings shall be painted throughout the system at convenient intervals, e.g., ere branch lines join the system, where the system passes underground or through walls, and at any other conspicuous places where warnings are required by safety authorities. If desired, operating ac- cessories may also be painted with the primary color warning.
5.1.4 Arrows and secondary color warnings. An arrow shape shall appear on coded piping sys- tems in any installation which is color coded in accordance with this standard. Any material system possessing an outstanding hazard of a type distinctly different from that indicated by its primary color warning shall have a secondary color warning applied in the shape of an arrow. The color of the arrow shall be selected according to the definitions for warning colors specified in 4.2. Systems which do not involve such additional hazards shall have arrows either the same color as the primary warning, or black or white. When bands are used for the primary warnings, the colored arrows shall appear adja- cent to each primary color warning applied to the piping system. When the entire piping system is painted with the primary color warning, the colored arrows shall appear in all locations specified in
5.1.3.2. The arrows shall indicate the normal direction(s)of flow of material in the system. A dou- ble-headed arrow shall be placed on lines subject to reverse flow. Dimensional information is is shown on figure 1. Tails may be omitted on arrows, creating triangles with one corner indicating the normal direction of flow. Operating accessories may also be painted with the secondary color warning.
5.1.5 Classification of material in piping systems. The classification of materials in a piping system shall be as specified in table II. N.O.S. refers to materials of like name and hazardous properties but "not otherwise specified." When no secondary color warning is specified, the arrow may be the same color as the primary warning or black or white, as preferred.
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