Spirax Sarco Series G Duplex

Overview

Spirax Sarco ”G” Series condensate and boiler feed pumps are packaged units completely
assembled, wired and tested at the factory. They are used in low pressure
steam heating systems to collect and quickly return condensate to the boiler or boiler
feed unit. Pumping action is controlled by an integral float switch on simplex (one
pump) units or mechanical alternator on duplex (two pump) units. Unlike boiler feed
units which are controlled by a boiler mounted control and equipped with a makeup
valve mechanism, condensate pumps usually do not directly supply boiler makeup
water.
AVAILABLE TYPES
Duplex units
Duplex units offer some additional distinct advantages over simplex units. They are
used where an unusually heavy amount of condensate must be returned or where it is
desirable to have a stand-by pump available. Equipped with a float operated, automatic
mechanical alternator, they provide several benefits.
System overload protectionThe second pump is activated if the rate of condensate
return exceeds the limits of the first pump.
Extra long service lifeEach of the two pumps is activated automatically on alternating
pumping cycles so the work load is evenly distributed between the two
pumps.
Back-up system protectionA second pump is automatically actuated if the first
one fails to start. Maintenance or repairs can be made on either pump without shutting
down the other one or interrupting system operation.