ASME A13.1-2007 pdf download.Scheme for the Identification of Piping Systems.
1 OBJECT AND SCOPE This Standard is intended to establish a common sys- Table 1 Examples of Content Descriptions Appearing in a Legend tem to assist in identification of hazardous materials conveyed in piping systems and their hazards when released in the environment. This scheme concerns identification of contents of pip- ing systems. It is recommended for the identification of piping systems used in industrial, commercial and institutional installations, and in buildings used for pub- lic assembly. It does not apply to buried pipelines nor to electrical conduits. Existing schemes for identification shall be considered as meeting the requirements of this Standard if “HOT WATER” “SLURRY” “AIR 100 PSIG” “ARGON 500 PSIG” “PROPANE” “H. P. RETURN” ANSI Z535.1, Safety Color Code “HYDRAULIC OIL” “FOAM” “CARBON TETRACHLORIDE” “CAUSTIC” “SULFURIC ACID” “STEAM 100 PSIG” (a) such schemes are described in writing (b) employees are trained as to the operation and haz- ards of the piping systems 2 DEFINITIONS AND REFERENCES 2.1 Piping Systems For the purpose of this Standard, piping systems shall include piping of any kind including fittings, valves, and pipe coverings. Supports, brackets, or other accesso- ries are specifically excluded from applications of this Standard. Piping is defined as conduits used to convey, distribute, mix, separate, discharge, meter, control, or snub fluid flows. 2.2 Materials 2.2.1 Flammable. This classification includes fluids, which under ambient or expected operating conditions, are a vapor or produce vapors that can be ignited and continue to burn in air. The term thus may apply, depending on service conditions, to fluids defined for other purposes as flammable or combustible. 2.2.2 Combustible. This classification includes flu- ids that can burn, but are not flammable. 2.2.3 Toxic and Corrosive. This classification includes fluids that are corrosive or toxic, or will produce corrosive or toxic substances when released. 2.2.4 Fire Quenching.
3 METHOD OF IDENTIFICATION 3.1 Legend This Standard considers a legend to be primary and explicit for identification of contents. Positive identifica- tion of the contents of a piping system shall be by lettered legend, giving the name of the contents in full or abbrevi- ated form (see Table 1). Arrows shall be used to indicate direction of flow. Where flow can be in both directions, arrows in both directions shall be displayed. Contents shall be identified by a legend with sufficient additional details such as temperature, pressure, etc., as are neces- sary to identify the hazard. Legends shall be brief, informative, pointed, and sim- ple for greatest effectiveness. Legends shall be applied close to valves or flanges and adjacent to changes in direction, branches, and where pipes pass through walls or floors; and at intervals on straight pipe runs sufficient for identification. Identification may be accomplished by stenciling, the use of tape, or markers. In any situa- tion, the number and location of identification markers shall be based on the particular piping system. 3.2 Color Color should be used to identify the characteristic hazards of the contents. Color should be displayed on, or contiguous to, the piping by any physical means, but its use shall be in combination with legend. Color may be used in continuous, total length coverage or in inter- mittent displays. Colors preceded by the word “Safety” shall meet the requirements of ANSI Z535.1. See Table 2.
3.3 Visibility Attention shall be given to visibility with reference to Table 3 Size of Legend Letters Outside Diameter of Pipe Length of Color Size of Letters, pipe markings. Where pipelines are located above or below the normal line of vision, the lettering shall be placed below or above the horizontal centerline of the pipe. See Fig. 1. 3.4 Type and Size of Letters Contrast shall be provided between color field and legend for readability. Use of letters of standard style, 1 Covering, in. (mm) 3 ⁄ 4 to 1 1 ⁄ 4 (19 to 32) 1 1 ⁄ 2 to 2 (38 to 51) 2 1 ⁄ 2 to 6 (64 to 150) 8 to 10 (200 to 250) Over 10 (over 250) Field, A, in. (mm) 8 (200) 8 (200) 12 (300) 24 (600) 32 (800) B, in. (mm) 1 ⁄ 2 (13) 3 ⁄ 4 (19) 1 1 ⁄ 4 (32) 2 1 ⁄ 2 (64) 3 1 ⁄ 2 (89) in sizes 1 ⁄ 2 in. (13 mm) and larger, is recommended. See Table 3 for specific size recommendations. For identifica- tion of materials in pipes of less than 3 ⁄ 4 in. (19 mm) in diameter, and for valve and fitting identification, the use of a permanently legible tag is recommended.