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Steam Systems - Piping Systems
October 21, 2002
Introduction
The design of steam piping systems is generally covered by
the following codes and standards:
ASME B31.1
Power Piping
ASME B16.5
Pipe Flanges and Flanged Fittings
ASME B16.34
Valves-Flanged, Threaded, and Welding End
Steam Line Sizing
It is important that the steam generated in the boiler
arrives at the end user at the desired pressure. Steam lines should be sized to
ensure that the line losses are not excessive. Velocities should also not be too
high as this can lead to excessive noise being generated. The following criteria can
be used for sizing main steam lines.
- High pressure: 2 to 3 psig/100 ft
- Medium pressure: 1 psig/100 ft
- Low pressure: 0.5 psig/100 ft
Specification
and Materials
| Fluid |
Pressure |
Temperature |
Size |
Specification |
Description |
| Superheated Steam |
7790 kPag
(1130 psig) |
510°C
(950°F) |
13 to 25 mm
(1/2" to 1") |
ASTM A335 Gr. P11
(1 1/4 Cr, 1/2 Mo) |
Sch. 40, Seamless |
| |
|
|
40 mm
(1 1/2") |
|
Sch. 80, Seamless |
| |
|
|
50 to 200 mm
(2" to 8") |
|
Sch. 80, Seamless |
| |
|
|
250 to 600 mm
(10" to 24") |
|
Sch. 100, Seamless |
|
