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TRAP OPERATION
A review of the trap operating principle will
show how various types of traps meet the dif-
ferent system characteristics.
Float & Thermostatic Traps
Advantages
Completely drains condensate at satura-
tion temperature.
Modulates to handle light or heavy loads,
continuous discharge equal to condensing
load.
Large ports handle high capacities.
Separate thermostatic vent allows fast
venting of air during start-up.
Modulating ports provide long life.
Cast iron bodies.
Disadvantages
Float or bellows may be damaged by water
hammer.
Primary failure mode is closed.
Does not withstand freezing temperatures.
Pressure limit of 175 psig.
FLOAT & THERMOSTATIC TRAP
During start-up the thermostatic vent is open
to allow free passage of air.
The thermostatic vent will close at near satu-
ration temperature. The balanced design will
allow venting of noncondensables that collect
in the float chamber, when operating at
design pressure.
Primary Applications
Heating main drip traps.
Shell & tube heat exchangers.
Tank heaters with modulating temperature
regulators.
Unit heaters requiring fast venting.
Steam humidifiers.
Air blast heating coils.
Air pre-heat coils.
Modulating loads.
Fast heating start-up applications.
FLOAT & THERMOSTATIC TRAP
The condensate port is normally closed during
no load. As condensate enters the float cham-
ber, the seat opens to provide drainage equal
to the condensing rate.
Operation,
Advantages,
Disadvantages,
and Primary
Applications
5
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