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Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

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Steam Systems - Piping Systems
October 21, 2002

Introduction
Steam Line Sizing
Specification and Materials
Associated Links

Waste Heat Boilers
Economizers
Superheaters

Commissioning


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.

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