Copyright © 2016 Cobra Systems, Inc. All rights reserved
22
Mark pipes
adjacent to
changes in
directions
Mark pipes at 25’ to 50’ intervals on straight runs.
Mark pipes on both
sides of floor or wall
intersections.
Mark pipe adjacent to all valves and flanges
Outside Pipe Diameter
Including Covering
Minimum Length of
Label Field Color
Minimum Height
of Letters
VnM4 Pipe Marking
Template
.75" - 1.25" (19 - 32 mm)
8" (203 mm)
.5" (203 mm)
2" Repeat Template
1.5" - 2" (38 - 51 mm)
8" (203 mm)
.75" (19 mm)
1" x 8" Template
2.5" - 6.0" (64 - 152 mm)
12" (305 mm)
1.25" (32 mm)
2" x 14" or 2" x 12" Template
8.0" - 10.0" (203 - 254 mm)
24" (610 mm)
2.5" (64 mm)
4" x 24" or 3" x 24" Template
Over 10.0" (Over 254 mm)
32" (813 mm)
3.5" (89 mm)
4" x 32" Template
Pipe markers must be placed in a manner which is visible to all persons
when looking up, down, or at eye level, and that the marker lettering
faces out for easy identification.
Pipe Marker Placement
VNM
WT
-XXXX
WHITE
VNM
BK
-XXXX
BLACK
VNM
GR
-XXXX
GRAY
VNM
BL
-XXXX
BLUE
VNM
PR
-XXXX
PURPLE
VNM
BN
-XXXX
BROWN
VNM
RD
-XXXX
RED
VNM
ON
-XXXX
ORANGE
VNM
YL
-XXXX
YELLOW
NATURAL GAS
ASBESTOS
SULFURIC ACID
OXYGEN
SPRINKLER WATER
DOMESTIC COLD WATER
COMPRESSED AIR
NITROGEN
RECLAIMED WATER
CARBON DIOXIDE
VNM
GN
-XXXX
GREEN
FLAMMABLE
Fluids which are a vapor or produce vapors
that can ignite and continue to burn in air.
Fluids that may burn but are not flammable.
Fluids which are corrosive or toxic or will
produce corrosive or toxic substances.
Water and other substances (e.g.: Halon, CO2)
used in sprinkler fire fighting piping systems.
Any other water except for water used in
sprinkler & fire fighting piping systems.
Any vapor or gas under pressure that does
not fit in a category above.
TOXIC & CORROSIVE
USER DEFINED
COMBUSTIBLE
FIRE QUENCHING
OTHER WATER
COMPRESSED AIR
USER DEFINED
USER DEFINED
USER DEFINED
VnM Media
Description
Pipe Properties
Example
Pipe Marker Color Chart
