Steam Boiler Piping - Dunkirk D247 Installation Instructions Manual

STEAM
STEAM CROSS
HEADER
LINE
LINE
FLUSH
rET
RETURN
WATER
CUT-OFF
SEE PAGE 12
POP SAFETY VALVE SHOULD BE FIELD INSTALLED AS CLOSE AS POSSIBLE TO BOILER
FIGURE 18
STEAM BOILER PIPING (Figure 18)
A full Steam Header is recommended on all steam systems
as shown above. On Boiler Models 300,400 and 500 the
full header may be eliminated and a single steam header
taken off either side of the boiler provided the system is
clean and properly designed.
Risers should be a full 4" and at least 20" in height. Use
skimmer tee as shown.
The area of the Main Steam Cross Header Pipe should be
equal to or larger than the total area of the Steam Supply
Mains leading from the Header and should never be smaller
than Supply tappings on Boiler. The Return Header should
be piped to both ends of the Boiler. The area of the Return
Header should be equal to the total area of the Return Mains
or larger.
Steam cross headers must be piped with swing joints, or
be equipped with a slip joint connector, in order to prevent
expansion and contraction of steam header from damaging
boiler.
Each installation has a preferred piping arrangement
according to the requirements of the particular system and
choice of arrangements and sizes of Headers should be
decided upon by the installer's heating engineer or with
standard engineering practice.
15
WARNING
NEVER INSTALL A SHUT-OFF OR
STEAM VALVE BETWEEN THE POP
SAFETY VALVE AND THE BOILER.
EQUALIZING LINE SIZE
MODEL NUMBERS
300 to 900
1000 to 1900
2000 to 2500
2600 to 3000
SIZE
2"
2½"
3"
4"