Install Instructions
Viega IM-MTL 0612
724607
49
Specific identification must meet the
requirements of the applicable local
codes. Each system, however, must
be clearly marked with appropriate
labels to identify that it is a gas
system, the type of the system (low
pressure, elevated pressure) and for
elevated pressure systems, the
system delivery pressure.
The low pressure system can use
the label shown in Figure 16.7 while
the high pressure system can use
markings similar to that shown in Figure
16.8. Labels should be affixed to the
tubing on both sides of a wall, floor,
or partition, at all changes in direction
and at maximum 6' intervals throughout
the length of the tube runs. Figure 16.9
shows a typical system label tag. This
type of tag can be used for marking
valves and other accessory items in the
piping system.
Guide to the ANSI A13.1 Standard for the Identification of Pipes
Material Properties Typical Applications Letter Color on Field Color
Inherently Hazardous
Materials, Extreme Pressure
or Temperature
Radioactive
Corrosive or Caustic
Toxic or Creates Toxic Gas
Explosive or Flammable
Fuel Gas, Natural Gas,
Liquefied Petroleum, Propane,
Butane, Fuel Oil, Boiler Blow
Down, Boiler Drain, Boiler
Feed Water, Glycol,
Condensate, Low Pressure
Steam, Non-Potable Water,
Vacuum
Pipe O.D. Including Covering
Minimum Length of
Label Field Color
Minimum Height of Letters
3/4" to 1-1/4"
19 mm to 32 mm 8" 203 mm
1/2" 13 mm
1-1/2" to 2"
38 mm to 51 mm 8" 203 mm
3/4" 19 mm
2-1/2" to 4" 64 mm to 108 mm 12" 305 mm 1-1/4" 32 mm
Table 16.7 Pipe marking guide
Black On Yellow
Marker Placement:
• Near valves, flanges and changes in direction.
• At both sides of ceiling, wall, or floor penetrations.
• At any line entry point.
• At frequent intervals on straight runs, typically every 6'.
• Locating pipemarkers so they are visible from the point of normal
approach.
• Providing arrows at one or both ends of the label to indicate direction
of flow.
Note: This guide is for general information purposes only. Pipe Markings
shall be in accordance with project specifications, or in the absence of
project specifications, in accordance with local code requirements.
NATURAL GAS
2 lb. PRESSURE
NATURAL GAS
IMPORTANT
2 lb. PRESSURE
NATURAL GAS
Figure 16.7 Pipe label for low pressure gas
Figure 16.9 Pipe tag for small dimension tubing and system accessories
Figure 16.8 Pipe label for high pressure gas