Advantages of the float-thermostatic
The trap continuously discharges condensate at steam temperature.
This makes it the first choice for applications where the
rate of heat transfer is high for the area of heating surface
It is able to handle heavy or light condensate loads equally
well and is not affected by wide and sudden fluctuations
of pressure or flowrate.
As long as an automatic air vent is fitted, the trap is
able to discharge air freely.
It has a large capacity for its size.
The versions which have a steam lock release valve are
the only type of trap entirely suitable for use where steam
locking can occur.
It is resistant to waterhammer.
Disadvantages of the float-thermostatic steam trap
Although less susceptible than the inverted bucket trap,
the float type trap can be damaged by severe freezing and
the body should be well lagged, and / or complemented with
a small supplementary thermostatic drain trap, if it is
to be fitted in an exposed position.
As with all mechanical type traps, different internals
are required to allow operation over varying pressure ranges.
Traps operating on higher differential pressures have smaller
orifices to balance the bouyancy of the float.