ULTRAFLOW® 54/34
Kamstrup A/S · Technical description · 5512-2464_A1_GB_08.2019
33
The steam pressure is the pressure where steam and liquid are in equilibrium at the current temperature (boiling point
at a given pressure). At low temperature and high pressure, water is in the liquid phase. At high temperature and low
pressure, water is in the steam phase. The blue curve (the steam pressure curve) in
equilibrium of the liquid and steam phases. This means that the static pressure in water must be increased at a given
temperature to avoid the steam phase that is shown in the lower right corner of the graph in
Figure 14. Steam pressure of water. At low temperature and high pressure, water is in the liquid phase.
At high temperature and low pressure, water is in the steam phase. The blue curve
characterizes the equilibrium of the liquid and steam phases.
Furthermore, it must be taken into account that the above static pressure is lower after a contraction than before (e.g.
at cones). This means that the static pressure
–
when measured elsewhere in the installation
–
might be different from
the pressure at the flow sensor outlet.
0
0,5
1
1,5
2
2,5
3
80
85
90
95
100
105
110
115
120
125
130
[bar
]
[°C]
Steam pressure
Liquid phase
Steam phase