Improved Dryness by Pressure Reduction

Dryness after throttling; give a separator efficiency and the dryness after separation follows.

Unit system

Inputs

Inlet pressure (absolute)

Inlet dryness fraction

1.00 means completely dry steam. Field steam is typically 0.90–0.97.Outlet pressure (absolute)

Separator efficiency

Leave at 0 if there is no separator. It is the fraction of incoming moisture removed; a good separator is 0.95–0.98.

Outlet dryness

0.9310

State at outlet

Wet steam — no separator

Dryness after throttling (before separator)	0.9310
Conserved enthalpy	2,576 kJ/kg
Outlet temperature	133.5 °C
Superheat at outlet	0 K
Remaining moisture fraction	0.0690

Throttling is isenthalpic: enthalpy is conserved, with no work or heat exchange. No energy is ADDED; the same energy corresponds to a higher dryness.
Separator efficiency is the fraction of INCOMING moisture removed; the separated water leaves as condensate and the steam flow drops accordingly.

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Results are for engineering pre-assessment and are not a product selection commitment. Final responsibility rests with the user.