Pipe Markings - ANSI Standard

Object and Scope of ANSI Pipe Markings

This Standard of ANSI Pipe Labeling 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
Pipe Markings with ANSI Standard for pipe identification.

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

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 placedbelow or above the horizontal centerline of the pipe.

Purposes of Standardization of Pipe Markings

Schemes for identification of the contents of piping systems have been developed in the past by a large number of industrial plants and organizations of various kinds. Generally speaking, the standards arrived in individual cases and have given satisfaction to those using them but they also have suffered from a lack of uniformity.

Mistakes made in turning valves on or disconnecting pipes at the wrong time or place have resulted in numerous injuries to personnel and damage to property. In particular, these sorts of mistakes have been made when outside agencies, such as municipal fire departments, 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 of the contents of piping systems on the basis of legends, it also suggests the use of color as a supplementary means of identifying the type of hazard of the material contained in the system.
Schemes for identification of the contents of piping systems have been developed 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 of the contents of piping systems on the basis of legends, it also suggests the use of color as a supplementary means of identifying the type of hazard of the material contained in the system.
* Information acquired from the A13.1-2020 Scheme for the Identification of Piping Systems
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