ASME
A13.1 Pipe Marking Requirements
For the Pulp & Paper Industry
ASME A13.1-2007 -
Identification of Piping Systems
(The ANSI standard is the same as the ASME pipe marking standard)
The following
is a summary of the ASME standards for marking and identifying pipes.
These standards apply to the pulp and paper industry for marking
all chlorine, caustic and acid lines. (These standards also apply
to many other industries.) This is intended to be a brief overview,
it is not a complete list of all pipe marking specifications.
O.D.
of pipe or covering
Length
of the color field |
Size
of the letters |
| inches |
mm |
inches |
mm |
inches |
mm |
| <
3/4" |
<
19mm |
A
permanently legible tag is recommended |
| 3/4
- 1-1/4 |
19
- 32 |
8 |
200 |
1/2 |
13 |
| 1-1/2
- 2 |
38
- 51 |
8 |
200 |
3/4 |
19 |
| 2-1/2
- 6 |
64
- 150 |
12 |
300 |
1-1/4 |
32 |
| 8
- 10 |
200
- 250 |
24 |
600 |
2-1/2 |
64 |
| over
10 |
over
250 |
32 |
800 |
3-1/2 |
89 |
Pipe
markers should include directional arrows, indicating the direction
of flow, at each end of the label. Directional arrows should go
around the entire circumference of the pipe (or pipe covering).
Pipes should be marked in the following locations:
1. Adjacent
to all changes in direction.
2. Adjacent to all valves and flanges.
3. At both sides of floor and wall penetrations.
4. At any point of entry into the line.
5. At 50 foot intervals on straight runs.
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