Flow Measurement Of Steam (Condensible Vapor) Or Clean Liquids; Flow Measurement Of Gas Or Liquid With Solids In Suspension - ABB 2600T Series Operating Instruction

8.12.1 Flow measurement of steam (condensible vapor) or
clean liquids
Fig. 19: Steam flow measurement
A High-pressure valve | B Low pressure valve |
C Equalizing valve | H High pressure side | L Low pressure side
Place taps to the side of the process line.
For liquid measurements, mount the transmitter next to or
underneath the taps, for steam measurements underneath the
taps.
Mount the vent / drain valve pointing upward.
For steam applications, fill the vertical section of the impulse
lines with a compatible fluid through the appropriate filling
connections.
The height of the liquid column between process line and
transmitter must be the same on the high pressure side and
the low pressure side, so that an accurate measurement is
ensured. For implementation of this requirement it can be
practical for steam measurements, to use the impulse lines
condensate tanks.
To commission the transmitter, operate the valves in the
following sequence:
1. Open the equalizing valve (C)
2. Close the low pressure valve (B) and high pressure valve
(A).
3. Open the primary shutoff valves
4. Slowly open the high pressure valve (A) so that the
measuring medium can flow into the measuring cell on
both sides.
5. Vent or drain the measuring cell and close the valves.
6. Open the low pressure valve (B) and close the equalizing
valve (C).
8.12.2 Flow measurement of gas or liquid with solids in
suspension
Fig. 20: Flow measurement of gases or liquids
A High-pressure valve | B Low pressure valve |
C Equalizing valve | H High pressure side | L Low pressure side
Place taps above or to the side of the line.
Mount the transmitter above the taps.
To commission the transmitter, operate the valves in the
following sequence:
1. Open the equalizing valve (C)
2. Close the low pressure valve (B) and high pressure valve
(A).
3. Open the primary shutoff valves
4. Slowly open the high pressure valve (A) so that the
measuring medium can flow into the measuring cell on
both sides.
5. Vent or drain the measuring cell and close the valves.
6. Open the low pressure valve (B) and close the equalizing
valve (C).
266CRx, 266JRx, 266CSx, 266JSx | OI/266CXX/266JXX/HART-EN Rev. B 27