ST = Strainer FT = Float and thermostatic steam trap MV = Manual air vent
GV= Gate valve VB = Vacuum breaker, 15° swing check valve
4.Vent the vacuum breaker line to atmosphere or connect it into the return main at the discharge side of the steam trap.
5.Pitch all steam supply and return mains down a minimum of 1 inch per 10 feet in the direction of flow.
6.Do not drain the steam mains or
7.Overhead returns require 1 psig of pressure at the steam trap discharge for each
8.Proper steam trap selection and installation is necessary for satisfactory coil performance and service life. For installation, use the following steps:
a. Locate the steam trap discharge at least 12 inches below the condensate return connection. This provides sufficient hydrostatic head pressure to overcome trap losses and ensure complete conden- sate removal.
b. Trane Company recommends using flat and thermostatic traps because of gravity drain and continuous discharge operation.
c. Use float and thermostatic traps with atmospheric pressure gravity condensate return, with automatic controls or where the possibility of low pressure supply steam exists.
d. Always install strainers as close as possible to the trap inlet side.
Reference Figure 8 for an ex- ample of a properly piped steam coil.
Figure 8. Example of typical piping to the steam coil.
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