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ASME A13.1-2020 pdf download

ASME A13.1-2020 pdf download.Scheme for the Identification of Piping Systems.
PURPOSES OF STANDARDIZATION Schemes for identification of the contents of piping systems have been developed in the past by a large number of industrial plants and organizations ofvarious kinds. Generallyspeaking, the standards arrived atinindividual cases have given satisfaction to those using them but they also have suffered from a lack ofuniformity. Mistakes made in turning valves on ordisconnectingpipes atthe wrongtime orplace have resulted in numerous injuries to personnel and damage to property. In particular, these sorts ofmistakes have been made when outside agencies, such as municipal fire depart- ments, were called in to assist. Furthermore, there has been considerable confusion for people who change employment from one plant to another. In order to promote greater safety and lessen the chances of error, confusion, or inaction, especially in times of emergency, a uniform system for the identification of piping contents has been established to warn personnel when the piping contents are inherently hazardous. Therefore, while this Standard has been prepared to specify the identification ofthe contents ofpiping systems on the basis oflegends, it also suggests the use ofcolor as a supple- mentary means of identifying the type of hazard of the material contained in the system. METRIC CONVERSIONS This Standard contains SI (Metric) units and U.S. Customary units. Either system may be used to meet the standard.
1 OBJECT AND SCOPE ThisStandardisintendedtoestablishacommonsystem to assistinidentificationofhazardous 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 ofpipingsystemsusedinindustrial,commercial,andinsti- tutional installations, and in buildings used for public assembly. Itdoes notapplyto buried pipelines norto elec- trical 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 2 ð20Þ 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:thematerialclassificationforfluidsthat,under ambient or expected operating conditions, are a vapor or producevapors thatcanbeignitedandcontinue to burnin air. The term thus mayapply, dependingon service condi- tions, to fluids defined forotherpurposes 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.4.2 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 a 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/NEMA Z535.1 (see Table 4.2-1). 4.3 ð20Þ Placement Attention shall be given to the visibility of the 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 Figure 4.3-1).Pipingthathas beenabandonedinplaceshouldbeiden- tified. The recommended color scheme is safety white background with black letters. A black border should be added to the identification. When the abandoned piping is protected from corrosion by the addition of a pressurized fluid orcontains residual hazardous material, the legend should indicate that.

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