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Pipe Labeling Resource Center

Pipe marking introduction

Which pipes need to be marked?

Are there different categories of pipes?

What are the labeling requirements

Are there rules for label placement?

What pipe marking products are offered?

Where can I get additional information?

Ammonia Pipe Labeling

Pipe labeling introduction

Hazardous materials flow through miles of pipes in most industrial, commercial and institutional facilities. Just like hazardous materials in other environments, piping systems need to be properly labeled to make people aware of the hazardous materials they carry. The ANSI A13.1-1981 program for identification of piping systems addresses this need by offering a common pipe labeling methodology for use in any facility.

Which pipes need to be labeled?

For optimal workplace safety, every above-ground pipe should be labeled. Highly visible or frequently accessed pipes may be the most important to label for day-to-day safety, but difficult to locate or infrequently accessed pipes should be labeled as well. Labeling pipes according to ANSI A13 helps guarantee a safe work environment.

Are there different categories of pipes?

The ANSI standard is most concerned with what is being transported in above-ground pipes. ANSI separates materials transported in above-ground piping systems into three categories. Each of these three categories should be properly marked for easy and quick identification.

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.

What are the pipe labeling 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.

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. The following table indicates ANSI-recommended letter height for various pipe sizes.

Outside Pipe Diameter (OD)	Letter Height

.75" to 1.25"	.5"
1.5" to 2"	.75"
2.5" to 6"	1.25"
8" to 10"	2.5"
over 10"	3.5"

Are there strict rules for pipe label placement?

The main thing to remember is that 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.

What pipe labeling products are offered?

Industrial Safety Solutions offers durable vinyl labeling tape in all the required sizes and colors for ANSI pipe marking. Our printer packages ship complete with software to help you quickly and easily create custom pipe marking labels. We also provide free full-color pipe marking guides.

Where can I get additional information?

We recommend you visit the following sites for additional pipe marking specific information, charts and diagrams.

Ammonia Pipe Labeling
OSHA 1910.111 Standard
ANSI Standards
PipeLabeling.com
PipeMarkerPro.com
OSHAPipeMark.com

Industrial Safety Solutions (ISS) provides supplies which exceed the quality specifications outlined by the original equipment manufacturer. ISS is the manufacturer of SafetyPro vinyl labeling tape. We offer exceptional compatibility for DuraLabel owners.

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