MIL-STD-101 Color Code For Pipelines And For Compressed Gas CylindersThis standard establishes a common color code for visual warnings to accompany the written identification of materials covered in piping systems and contained in compressed gas cylinders, and to facilitate the segregation of these cylinders at depots. This standard does not define the manner or conditions under which these materials may be used safely.

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MIL---STD---101C

(f)  Red, No. 11105 ��� fire protection materials.  All  materials provided in piping systems or in compressed gas cylinders exclusively for use in fire protection.

4.3  Colors having no significant meaning.

(a) Black, No. 17038 and White, No. 17875. These colors are assigned, without significant meaning, for general use where specified in this standard except as follows: Water---piping sys- tems containing water suitable for human consumption and installed for this purpose shall be painted White, No. 17875 throughout or shall be painted to match surroundings when not in conflict with other color designations in this standard

(b)  Orange, No. 12246 and Buff, No. 13594.  These colors are assigned, without signifi- cant meaning, for use as colors on selected compressed gas cylinders for segregation of identical material requiring recognition within more than one assigned class (see table III.)

5.  DETAILED  REQUIREMENTS

5.1  Piping system identification.

5.1.1 Exact identification. Exact identification of materials in any piping system for hazard- ous materials and the use classification for fire protection is mandatory and shall be made only by means of titles lettered in black or white.  These titles shall be prominently displayed adja- cent to color warnings to obviate errors by personnel.   It is recommended, where the view is unobstructed, that titles be lettered on the two lower quarters of the pipe or covering.  Lettering in this position is unlikely to be obscured by dust collection or mechanical damage.  However, titles should be clearly visible from operating positions, especially those adjacent to control valves.  The use of stencils with standard size letters specified in table I is recommended.  For pipe lines smaller than 3/4 inch in diameter, the use of securely fastened metal tags, with letter- ing etched or filled in with enamel is suggested.  It is recommended that titles be applied by use of upper case letters and Arabic numerals whenever applicable.

TABLE I.  Size of stencil letters.

TABLE I.  Size of stencil letters--- Continued.

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