ASME A13.1:2020 pdf download.Scheme for the Identification of Piping Systems.
ASME A13.1 is intended to establish a common system to assist in identifIcation of hazardous materials conveyed in piping systems and the materials’ hazards when released in the environment.
This scheme concerns identification of contents of piping systems. It is recommended for the identification of piping systems used in industrial, commercial, and institutional installations, and in buildings used for public 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
(a) such schemes are described in writing
(b) employees are trained as to the operation and hazards of the piping systems
2O; 2 DEFINITIONS
combustible: the material classification for fluids that can burn, but that are not flammable.
fire quenching: the material classification including water, foam, and carbon dioxide used in sprinkler systems and fire-fighting piping systems.
flammable: the material classification for fluids that, 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.
oxidizing: the material classification for fluids that may, generally by providing oxygen, cause or contribute to the 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 other accessories are specifically excluded from applications of this Standard.
toxic and corrosive: the material classification for fluids that are toxic or corrosive, or that will produce toxic or corrosive substances when released.
4 METHOD OF IDENTIFICATION
4.1 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. The following are examples of content descriptions appearing in a legend:
(a) “HOT WATER”
(b) “SLURRY”
(c) “AIR 100 PSIG”
(d) “ARGON 500 PSIG”
(e) “PROPANE”
(f) “HP RETURN”
(g) “HYDRAULIC OIL”
(h) “FOAM”
(1) “CARBON TETRACHLORIDE”
(I) “CAUSTIC”
(k) “SULFURIC ACID”
(1) “STEAM 100 PSIG”
Legends shall use arrows 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 and pressure, as are necessary to identify the hazard.ASME A13.1 pdf download.