Discharge Piping - Dunkirk 90-50 Installation, Operation & Maintenance Manual

Figure5 - SingleZoneBoilerPiping
DISCHARGE
PIPING
Pressure Relief V alve
The boiler is furnished with a factory installed reliefvalvein the top
of the boiler. Provide 3_,, p iping frorn the supplied reliefvalveto a
local floor drain, but leavean air gap between piping and drain. No
shutoffof any description shall be placed between safety reliefvane
and the boiler, or on the discharge pipes between such safetyvalve
and the atmosphere. Installation of the safety reliefvalve shall con-
forrn to ANSI/ASMEBoiler and Pressure VesselCode, Section IV.
The manufacturer is not responsible for aW water damage.
Expansion Tank And Make-Up Water
Deterrnine required systern fill pressure, systern design ternperature,
and systern water content. Boiler contains 2.6 gallons (U.S.). Size
expansion tank accordingly. Consult expansion tank manufacturer
for proper sizing information. Connect properly sized expansion
tank (not furnished) as shown in Figure 6 for diaphragm type ex-
pansion tank and Figure 7 for conventional closed type expansion
tanks. For diaphragm type expansion tanks, adjust the tank air pres-
sure to match the systern fill pressure. Install air vent (furnished)
as shown for diaphragm type expansion tank systern only. Install
make-up water connections as shown per local codes. If a pressure
reducing valve is used, adjust to match the systern fill pressure. In
connecting the cold make-up water supply to the boiler, make sure
that clean water supply is available. When the water supply is from a
well or pump, sand strainer should be installed at the pump.