ASME A13.1 pdf download

ASME A13.1 pdf download.Scheme for the ldentification of Piping Systems.
3 METhOD OF IDENTIFICATION
3.1 Legend
This Standard considers a legend to be primary and explicit for identification of contents, Positive identification of the contents of a piping system shall be by lettered legend, giving the name of the contents in full or abbreviated 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 necessary to identify the hazard.
Legends shall be brief, informative, pointed, and simple for greatest effectiveness. Legends shall be applied close to valves or flanges and adlacent 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 situation, the number and location of identification markers shall be based on the particular piping system.
The applicable GHS’ pictogram as illustrated in Fig. I may be included as part of the legend.
Where piping is connected to containers that are labeled in accordance with GHS requirements, a corresponding labcl on the piping may be provided. The corresponding label should contain at least the product name or identifier, the pictogram, the signal word, and the physical, health, and environmental hazard statement(s).
3.2 Color
Color should he 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 intermittent displays. Colors preceded by the word “Safety” shall meet the requirements of ANSI Z535.I (see Table 2).
3.3 VIsibility
Attention shall be given to visibility with reference to pipe markings. Where pipelines arc located above or below the normal line of vision, the lettering shall he placed below or above the horizontal centerline of the pipe (see Fig. 2).
3.4 Type and Size of Letters
Contrast shall be provided between color field and legend for readability. Use of letters of standard style,2 in sizes ‘/ in. (13 mm) and larger, is recommended. See Table 3 for specific size recommendations. For identification of materials in piping with an outside cover diameter less than in. (9 mm), and for valve and fitting identification, the use of a permanently legible tag is recommended.
3.5 Unusual or Extreme Situations
Piping layouts that are in a limited area of inaccessibility or of extreme complexity may require substitute techniques to achieve positive identification. Use of substitute techniques shall be limited to such segments and shall not deviate from the concept of identification described in paras. 3.1, 3.2, and 3.3.