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Excess Superheat can impair dryer performance, increase maintenance costs and cause your
operation to exceed equipment operating limits. Since the specific volume of
superheated steam is greater than the specific volume of saturated steam for the
same energy, line speeds, pressure drops and wear are greater with superheated
steam than with saturated stream. Superheated steam is dry while saturated steam
is not. The lubrication in saturated steam is essential to rotary joint life.
Many of the seals, gaskets, glass and other materials in steam systems have
temperature limits. At higher pressures, superheated steam can lead to
temperatures that exceed these limits.
Units are usually installed in supply headers operating at higher pressures.
The principle of operation is to reduce the steam temperature and the amount of
superheat by injecting condensate directly into the flow of steam. The
principal benefit of this design is it's compactness.
These units are preferred where control is critical. Condensate is sprayed over a pad through which the
superheated steam passes. The benefit of this design is the improvement in the
mixing of the steam and the condensate. Also any excess condensate is retained
in the unit rather than in the downstream piping. This design is frequently
applied on low pressure steam where precision desuperheating is