Slant/Fin Gas Steam - Manual (Page 9)

9
STEAM SUPPLY AND RETURN PIPING
Modular steam boilers must be piped in a way that provides near-
ly equal steam pressure at all modules. Supply and return pipes
and fittings should be identical on each module. The pressure
drop in the supply header, between the connection to the building
and the supply tapping on each module must be kept to a mini-
mum. When installed properly, this will result in minimal variance
in water levels between modules. Figure 8 shows the take off to
the system after the last module and before the equalizer/drain
line. Header size shown on this page (Table 8) is based on this
piping arrangement. Figure 9 shows the piping arrangement
between the module and header connections. In this area, try to
keep the number of elbows to a minimum (maximum 3). It is
important to note that a pressure difference of as little as one
ounce (1/16 PSI) between modules will result in a water level dif-
ference of almost 2 inches.
2 1492 3” 1 1 ⁄
2
”
3 2238 4” 2”
4 2983 5” 2”
5 3729 6” 2”
Table 8: Modular steam boiler plant header pipe sizing
No. of
Modules
Capacity Steam
EDR
Gas
Header Pipe Sizes
Supply
Gas
Return
Maximum 5 modules per bank.
Figure 8: Piping details
Figure 10: Steam supply header
at gas modules
Figure 9: Steam supply header piping