User Guide | Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
© Danfoss | DCS (ms) | 2020.01
BC306932151284en-000201 | 9
Connection locations
The correct locations for the air purger to be
connected to the ammonia plant are:
(See Fig. 6 and Fig. 7)
- on top of the receiver or
- on top of the liquid in the drop leg from the
condenser.
The air purger (5) is connected to the two purge
points through solenoid valves (px and py).
Note that only one solenoid should be open at
any given time, otherwise the liquid column in
the condenser will be short-circuited.
The air purger must have its own liquid return
drop leg (c) connected in parallel with the
condenser’s drop legs (b).
When the purger is connected to the receiver
i.e. solenoid (px) open, the liquid level in the air
purgers drop leg (c) will be equal to the receiver
liquid level (3); when the purger is connected to
the condenser outlet i.e. solenoid (py) open, the
liquid level will
be equal to the liquid level in the
condenser drop leg (b).
Fig. 6 Purger connections (px) & (py). Drain piping (c) must be vertical/downward slope
Air purger installation in a low-pressure liquid level controlled installation
Alternatively, the air purger draining of liquid can
be achieved effectively through an HP float valve
(6) to the low pressure side (see Fig. 7).
Fig. 7 Purger connections (px) & (py). Drain piping (c) must be vertical/downward slope
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