Air Mixed in Steam — Air Fraction from Measurement

The air fraction in the line from the measured pressure and temperature. If pressure and temperature disagree, the difference is air.

Unit system

Inputs

Measured pressure (absolute)

Measured temperature

Measure in the steam, not on the equipment surface. A surface reading also carries the heat transfer and overstates the air fraction.

Air fraction (by volume)

0.0991

Temperature lost

3.525K

Diagnosis	SIGNIFICANT air — the vent is missing, blocked or undersized. Heating performance is affected.
Temperature this pressure should give	133.5 °C
Partial pressure of steam	2.703 bar a

The measured temperature is taken as the saturation temperature of the steam PARTIAL pressure; the reading must come from inside the steam.
A low temperature can have other causes (heat loss, wet steam). This attributes the WHOLE difference to air; read it alongside the other symptoms.

A PDF carrying the inputs, results, assumptions and the source. A one-time code is sent to your address.

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