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ANSI Pipe Marking Standards
Document Number: 203
Hazardous materials flow through miles of piping in many industrial,
commercial and institutional facilities. Just like hazardous materials
in other situations, piping systems should be appropriately labeled to
make people aware of the materials they carry. The older versions (1981
& 1996) of the ANSI (American National Standards Institute) A13.1 standard
have merged into the ANSI/ASME (American Society of Testing and Materials)
A13.1 Scheme for Identification of Piping Systems. This merged standard
ANSI/ASME A13.1, addresses pipe marking by offering a common labeling
method for use in all industrial, commercial, institutional facilities
and in buildings used for public assembly. This standard does not apply
to buried pipelines or electrical conduit.
Label Requirements
Pipe
marking labels must effectively communicate the contents of the pipes
and give additional detail if special hazards (such as extreme temperatures
or pressures) exist. The legend should be short in length and easy to
understand. For example, the legend "Steam 100 PSIG" specifies the contents
as well as the additional pressure hazard. An arrow should be used in
conjunction with the legend to show which direction the material flows.
If flow can be in both directions, arrows in both directions shall be
displayed.
The older versions (1981 & 1996) of ANSI A13.1 separated materials transported
in above-ground piping systems into three categories:
- High-Hazard Materials: Encompasses several hazard areas including
corrosive and caustic materials; substances that are toxic or capable
of creating toxic gases; explosive and flammable materials; radioactive
substances; and materials that, if released, would be hazardous due
to extreme pressures or temperatures.
- Low-Hazard Materials: Materials that are not inherently hazardous
and have a small chance of harming employees through mild temperatures
and low pressures.
- Fire Suppression Materials: Fire protection materials such as foam,
carbon dioxide (CO2), Halon and water.
The three hazard classes have different color-coded labels associated
with them. All high-hazard materials use black characters on a yellow
background. The low-hazard material class is divided into two different
color schemes: liquids or liquid mixtures use white characters on a green
background; gases or gaseous mixtures use white characters on a blue background.
The fire suppression class uses white letters on a red background. The
letters on pipe labels should be a minimum of 1/2" high, and should increase
in size as the pipe diameter increases-(Table 3).
The 2007 edition of the ANSI/ASME A13.1 changed the color scheme requirements
for the labels. In this new edition of the standard, there are 6 standard
colors instead of 4 colors. The new label color requirements are based
on the characteristic hazards of the contents. See Table 2 below for the
new color requirements.
Label Placement
Labels should be positioned on the pipes so they can be easily read.
Proper label placement is on the lower side of the pipe if the employee
has to look up to the pipe, on the upper side of the pipe if the employee
has to look down towards the pipe, or directly facing the employee if
on the same level as the pipe. Labels should be located near valves, branches,
where a change in direction occurs, on entry/re-entry points through walls
or floors, and on straight segments with spacing between labels that allows
for easy identification.
Exceptions to this Standard
Other pipe labeling systems are acceptable if they are put in writing
and meet the basic ANSI requirements.
Commonly Asked Questions
| Q. |
Can I still use my current pipe marking system based on the
older version of the standard or do I have to change my color scheme
to meet ASME A13.1 2007? |
| A. |
Existing schemes for identification shall be considered as meeting
the requirements of the standard if the schemes are described in writing
and employees are trained in the operation and hazards of the piping
system. |
| Q. |
What if I have a pipe smaller than ¾”? |
| A. |
For pipes of less than ¾” in diameter the use of a permanently legible
tag is recommended. |
| Q. |
Are particular shades of yellow, green, red and blue required
for pipe labels? |
| A. |
Yes, ANSI/ASME A13.1- recommends the color code featured in the
ANSI Z53.1- Safety Color Code for Marking Physical Hazards. The color
shades recommended are intended to give highest level of recognition
to employees with both normal and color-deficient vision. |
| Q. |
Has this ANSI Standard been adopted by OSHA? |
| A. |
No, it is still considered an industry consensus standard, which
is only a recommendation. Even though it has not been specifically
adopted by OSHA, industry consensus standards may be evidence that
a hazard is “recognized” and there is a feasible means of correcting
such a hazard. If you do not follow a consensus standard, it is possible
to be cited under the General Duty Clause. |
References
ASME A13.1-2007 Scheme for the Identification of
Piping Systems, American Society of Mechanical Engineers, New York,
NY 10016.
ANSI A13.1-1981 Scheme for the Identification of
Piping Systems, American National Standards Institute, New York,
NY 10036.
ANSI Z53.1-1979 Safety Color Code for Marking Physical
Hazards, American National Standards Institute, New York, NY 10036.
ANSI Z535.1-1991 Safety Color Code, American
National Standards Institute, New York, NY 10036.
American National Standards Institute: 11 W. 42nd St.
New York, NY 10036 (212)642-4900.
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Please Note: The information contained
in this publication is intended for general information purposes only. This
publication is not a substitute for review of the applicable government
regulations and standards, and should not be construed as legal advice or
opinion. Readers with specific questions should refer to the cited regulation
or consult with an attorney.
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