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SEMI F34-0998 © SEMI 1998 3 Table 2 Recomme nded Label and Text Si zes for Various Piping Diameters Outside Diameter o f Pipe or Cover ing Minimum Length of Label Minimum Height o f Letters Millimeter s Inche s Millimete…

SEMI F34-0998 © SEMI 1998 2

Table 1 Piping and Label Color Codes

Chemical Category Background Color Text Color

Highly Toxic, Poisonous Black White

Flammable, Combustible, and Pyrophoric Red White

Acidic Orange Black

Basic (Caustic) Magenta White

Oxidizer Yellow Black

Non-Toxic, Non-Flammable,Low to Moderate Physical Hazard Green White

6.5 Additional information such as the chemical category, chemical formula, acronyms, hazard ratings, or other

information may be added, provided that it does not interfere with the primary information required. A separate label

may be used for the additional information.

6.6 The color field label length and lettering sizes shown in Table 2 should be used for all diameters of pipe and

tubing. For pipe diameters smaller than 12.7 mm (0.5 inch), the label should be large enough to wrap at least half

way around the pipe, and not obstruct the text. If labeling inside equipment, the size of the labels may be adjusted,

provided they remain easily seen and readable. Consideration should be given to using tags instead of labels.

NOTE: Labeling sizes for piping 19 mm (0.75 inch) or larger in outside diameter were taken directly from ANSI A13.1. Smaller

sizes were developed for this guide.

6.7 The height of the label should be at least two times (2×) the height of the text, with the text centered in the

label. The label should allow a length of background color on each end of the text at least one half pipe diameter in

length but not less than 12.7 mm (0.5 inch).

6.8 The orientation of text on the label should conform to local customs, conventions, or practices.

6.9 Directional flow arrows should be applied to all piping systems indicating the direction of material flow within

the system. The arrow(s) should be included as part of the primary label but may be applied separately within close

proximity to the primary label (e.g., less than 5 cm (2 inches) for pipe diameters up to 5 cm (2 inches); less than 15

cm for larger pipe diameters).

6.10 Labels should be applied to the piping system at the following minimum locations:

• On both sides of a barrier penetration (i.e., walls, floors, ceilings, equipment enclosures, etc.). The labels should

be applied within 1 meter (3.3 feet) or as close as practical to the barrier.

• As close as practical to all changes in direction where the length of run in the new direction is 1 meter (3.3 feet)

or greater. Where several directional changes are made within a short length of run, labels need not be applied

at every change in direction, but should be applied at sufficient intervals to readily identify the piping.

• On long runs, the labels should be applied at intervals not exceeding 6 meters (20 feet). Shorter intervals should

be used for small diameter pipe and where several pipes are run in close proximity.

• Where several pipes are run parallel to each other, the labeling for all pipes should be in line with each other

(i.e., should not be staggered).

• A sufficient number of labels should be applied at each location to ensure that they can be readily seen and read

from all viewing or approach direction(s).

• Each side of a “T” connection should be labeled within 1 meter (3.3 feet) of the “T”.

SEMI F34-0998 © SEMI 19983

Table 2 Recommended Label and Text Sizes for Various Piping Diameters

Outside Diameter of Pipe or Covering Minimum Length of Label Minimum Height of Letters

Millimeters Inches Millimeters Inches Millimeters Inches

Less than 13 Less than 0.5 51 2 3 0.125

13–19 0.5–0.75 102 4 6 0.25

19–38 0.75–1.5 203 8 13 0.5

38–64 1.5–2.5 203 8 19 0.75

64–203 2.5–8 305 12 32 1.25

203–254 8–10 610 24 64 2.5

Over 254 Over 10 813 32 89 3.5

6.11 Where it is impractical to attach markings or labels directly to the pipe, a tag may be used. The tag should be

durable for the environment in which it is used and should be securely attached to the piping system such that it

cannot be easily removed or relocated from its installed position. The tag or tags should contain the same

information as defined for labels in Sections 6.4 and 6.5. Standard color-coding for tags should be the same as

defined for labels in Table 1. Tags should be installed at the same locations as required for other identification

methods defined in Section 6.10.

7 Related Documents

7.1 ANSI Document

ANSI Z535.1 — Safety Color Code

7.2 BSI Document

BS 1710 — Identification of Pipelines and Services

7.3 DIN Document

DIN 2403 — Kennzeichnung von Rohrleitungen nach dem Durchflußstoff (Identification Code for Pipe Lines

According to Media)

7.4 ISO Documents

ISO 3864 — Safety Colours and Safety Signs

ISO/DIS 14726-1 — Ships and Marine Technology — Identification Colours for the Contents of Piping Systems —

Part 1: Main Colours and Media (Revision of ISO/R 508:1966) { ISO/R 508:1966 was withdrawn by TC 8 in 1986}

2 British Standards Institution, 389 Chiswick High Road, GB-London W4 4AL, Telephone:+ 44.181.996.90.00, Telefax:+ 44.181.996.74.00, E-

mail: info@bsi.org.uk, WWW: http://www.bsi.org.uk/

3 DIN Deutsches Institut für Normung, Burggrafenstrasse 6, D-10787 Berlin, Germany, Postal Address: D-10772 Berlin, Telephone:+

49.30.26.01.0, Telefax:+ 49.30.26.01.12.31, Telex: 18 42 73 din d, Telegram: deutschnormen berlin, E-mail: postmaster@din.de, WWW:

http://www.din.de/

4 International Organization for Standardization, Central Secretariat, 1 rue de Varembe, Case postale 56, CH-1211, Geneve 20, Switzerland,

Telephone:+ 41.22.749.01.11, Fax:+ 41.22.733.34.30, E-mail: central@iso.ch, WWW: http://www.iso.ch/

7.5 United States Department of Transportation

Document

Title 49, Code of Federal Regulations

NOTICE: These standards do not purport to address

safety issues, if any, associated with their use. It is the

responsibility of the user of these standards to establish

appropriate safety and health practices and determine

the applicability of regulatory limitations prior to use.

SEMI makes no warranties or representations as to the

suitability of the standards set forth herein for any

particular application. The determination of the

suitability of the standard is solely the responsibility of

the user. Users are cautioned to refer to manufacturer’s

instructions, product labels, product data sheets, and

other relevant literature respecting any materials

mentioned herein. These standards are subject to

change without notice.

The user’s attention is called to the possibility that

compliance with this standard may require use of

copyrighted material or of an invention covered by

patent rights. By publication of this standard, SEMI

takes no position respecting the validity of any patent

rights or copyrights asserted in connection with any

item mentioned in this standard. Users of this standard

are expressly advised that determination of any such

patent rights or copyrights, and the risk of infringement

of such rights, are entirely their own responsibility.

5 US Government Printing Office, Washington, D.C., USA

International), 3081 Zanker Road, San Jose, CA 95134. Reproduction o

the contents in whole or in part is forbidden without express written

consent of SEMI.