Dunkirk PVSB - Common Near Boiler Piping Mistakes; Chilled Water Piping

WRONG WAY
DONOTBULLHEAD,USE
TWOTAKEOFFS
THIS PIPING CONFIGURATION
tS INCORRECTTO SHOW
COMMONMISTAKES
WAY
TAKEOFFSMUSTBEBETWEENRISER&EQUALIZER
WRONG WAY
SWINGJOINTSAREMISSING
WRONG WAY
MiSSiNGTEE
FORSKIMMING
12. The near boiler piping shall include a 11h" ball valve
in the return piping as shown for bottom blowdown and
draining.
13. Forgravity return systems, the bottom of the lowest steam
carrying pipe, be it a dry return, or the end of the steam
main, must be at least 28" above the normal water level
line on the right side of the boiler. This is known as
"Dimension A."
14. For pumped returnsystems, follow the condensate pump
or boiler feed pump manufacturer's instructionsfor proper
installation and hookup.
15. In connecting the cold water supply to the water inlet
valve, make sure that a clean water supply is available.
When the water supply is from a welt or pump, a sand
strainer should be installed at the pump.
FOR USE WITH COOLING UNITS
A. This boiler, when used in connection with chilled water
, systems,mustbe installed so that the chilled water ispiped
in parallel with the heating boiler. Appropriate valves must
be used to prevent the chilled water from entering the
heating boiler (Fig.7).
B When this boiler is connected to heating coils located
in air handling units where they may be exposed to
refrigerated air circulation, the piping system shall be
equipped with flowcontrol valves or other automatic means
to prevent gravity circulation of the boiler water during
the cooling cycle.
VALVES A & B
OPEN FOR HEATING;
CLOSE FOR COOLING
VALVES C & O
CLOSE FOR HEATING:
OPEN FOR COOLING
WATER
CHILLER
TO SYSTEM t
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