MIL-STD-161G
4.5 NATO symbol marking. Piping systems handling products for which a NATO Symbol has been established, and are located in an area subject to servicing ground, sea, or air equipment of NATO countries will, in addition to the NATO symbol, include the appropriate U.S. Military Symbol (if established) as a part of the title in accordance with 5.1.1.
5. DETAILED REQUIREMENTS
5.1 Liquid petroleum and hydrocarbon missile fuels facilities system identification.
5.1.1 Titles. Exact identification on rigid piping systems and above ground fixed storage tanks is mandatory. If identification of tank trucks, semi-trailers or tank cars is desired or specified by departmental directives, the system described herein may be used.
5.1.1.1 Application of titles. Titles will be applied in such a manner as to be clearly visible from operating positions. The use of stencils with standard size markings specified in Table II is recommended. The black background will have a minimum border three-fourths inch wider than the lettered area. For piping smaller than three inches in diameter, metal flags or signs securely fastened to the pipe may be used with the appropriate title and products group band(s) lettered on the tag.
5.1.2 Color of NATO symbol marking. The appropriate NATO symbol and the broken line enclosure shall be of yellow color.
5.1.3 Product group band(s). The yellow band(s) will be separated and distinguish the various groups of products. Except for lubricating oil lines (5.1.4) and multiproduct lines (5.1.5), petroleum products other than Thermally Stable Jet fuels and missile fuels are identified with one or more narrow bands. Thermally stable jet fuels are identified with a wide band, twice the width of a narrow band, followed by a narrow band, followed by another wide band. Hydrocarbon missile fuels are identified with one wide band, twice the width of the narrow band, followed by one narrow band. See Table II. It must be re-emphasized that the title is the principal identifying feature and the band(s) is not to be relied upon to identify a particular product.
5.1.4 Lubricating oil lines. Because of the infrequency of its use, bands have not been assigned to lubricating oils. A flag or sign may be employed as illustrated in figure 6. Each flag or sign shall have a yellow border of a minimum of three-fourths inch in width.
5.1.5 Multiproduct lines. When a single pipeline is used for transporting more than one product, a flag or sign identifying the product currently in transit may be used in lieu of or as a supplement to the wide yellow identification band and nomenclature shown in figure 10. Identification of the product will be made at the time of transfer. The yellow band in these instances will be a minimum of thirty-six inches in width.
5.1.6 Use of arrows. An arrow painted in yellow may be used to indicate the direction of flow of the product in the line. It will appear adjacent to the title and band(s) as shown in figure 11.
5.1.7 Application of flags. In instances where a piping system or tankage is buried or inaccessible, and only a valve stem and a wheel or gauging hatch are exposed, a metal flag or brass disc will be used as an aid identifying the product in the facility. The flag post may be permanently fixed to the pipeline or tank or in concrete adjacent to the structure. The brass identification disc will be placed on top of the valve wheel or gauging hatch.
5.1.8 Concrete valve and refueling pits. In concrete pits and similar conditions where space will not permit banding and stenciling of the pipe, the vertical band(s) will be painted on the wall adjacent to the pipe to represent a product group. The title of the product will be stenciled horizontally in white across the band(s). Where pit covers are installed, markings may be applied to the top of the covers.
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