ASME A13.1:2020 pdf free download – Scheme for the ldentification of Piping Systems
1 OBJECT AND SCOPE
This Standard is intended to establish a common systemto assist in identification of hazardous materials conveyedin piping systems and the materials’ hazards whenreleased in the environment.
This scheme concerns identification of contents ofpiping systems. It is recommended for the identificationof piping systems used in industrial, commercial,and insti-tutional installations, and in buildings used for publicassembly. It does not apply to buried pipelines nor to elec-trical conduits.
Existing schemes for identification shall be consideredas meeting the requirements of this Standard if
a) such schemes are described in writing
b) employees are trained as to the operation andhazards of the piping systems
2 DEFINITIONS
combustible: the material classification for fluids that canburn, but that are not flammable.
fire quenching: the material classification including water.foam, and carbon dioxide used in sprinkler systems andfire-fighting piping systems.
flammable: the material classification for fluids that, underambient or expected operating conditions, are a vapor orproduce vapors that can be ignited and continue to burn inair.The term thus may apply, depending on service condi-tions,to fluids defined for other purposes as flammable orcombustible.
oxidizing: the material classification for fluids that may,generally by providing oxygen, cause or contribute tothe combustion of other material more than air does.piping: conduits used to convey, distribute, mix, separate,discharge, meter, control, or snub fluid flows.
piping systems: piping of any kind,including fittings,valves, and pipe coverings. Supports, brackets,or otheraccessories are specifically excluded from applicationsof this Standard.
toxic and corrosive: the material classification for fluidsthat are toxic or corrosive, or that will produce toxicor corrosive substances when released.
Legends shall use arrows to indicate direction of flow.where flow can be in both directions,arrows in both direc-tions shall be displayed.Contents shall be identified by alegend with sufficient additional details,such as tempera-ture and pressure, as are necessary to identify the hazard.Legends shall be brief, informative,pointed, and simplefor greatest effectiveness.Identification may be stenciledor taped on, or marked in ink. In any situation, the number and location of identification markers shall be based onthe particular piping system.
The applicable GHs1 pictogram as illustrated in Figure4.1-1 may be included as part of the legend.
Where piping is connected to containers thatare labeledin accordance with GHS requirements, a correspondinglabel on the piping may be provided.The correspondinglabel should contain at least the product name or identi-fier, the pictogram, the signal word, and the physical,health, and environmental hazard statement(s).
4.2 Color
Color should be used to identify the characteristichazards 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 a legend. Colormay be used in continuous,total-length coverage or inintermittent displays. Colors preceded by the word“Safety” shall meet the requirements of ANSI/NEMAZ535.1 (see Table 4.2-1).
4.3 Placement
Attention shall be given to the visibility of the pipemarkings. Where pipelines are located above or belowthe normal line of vision, the lettering shall be placedbelow or above the horizontal centerline of the pipe(see Figure 4.3-1).
Legends shall be applied close to valves or flanges; adja-cent to changes in direction, branches, and where pipespass through walls or floors; and at intervals on straightpipe runs sufficient for identification. For piping layoutswhere applying legends in this way is impractical, substi-tute techniques to achieve positive identification are ac-ceptable.One such technique is placing the legends onplates that are attached to the piping.