User Guide
|
Intelligent Purger System (IPS) for Ammonia - Technical data, installation, and use
6 |
BC297731816824en-000101 | 148R9643
Air traps
dP cond
Liquid level
2
1
a
b
3
4
y
x
2
1
a
b
3
4
dP cond
Liquid level
y
x
Fig. 4 Liquid level. Bottom connected receiver
Fig. 5 Liquid level. Top connected receiver
For systems with low pressure liquid level control,
the proper installation of the condenser/ receiver
is as shown in fig . 4 and 5 .
The discharge gas from the compressor (1) is
led to the condenser (2) where it is condensed .
The receiver (3) holds the liquid until there is a
demand for liquid from the LP side, e .g ., until the
expansion valve (4) opens . If the expansion valve
is closed, the liquid condensed in the condenser
will need to be stored in the receiver and the
level will increase . To secure a free flow to the
receiver, the gas must be allowed to leave the
receiver; this process is accomplished through
the pressure equalizing line (a) . The pressure
equalizing line makes the pressure in the receiver
the same as in the compressor discharge line .
The pressure in the condenser outlet is lower
due to the pressure loss in the condenser . Since
the pressure is lower than in the receiver, it is
necessary to mount the condenser higher than
the receiver and allow for a higher liquid level
in the piping between the condenser and the
receiver (b) .
This liquid column in the line (b) compensates for
the pressure difference .
Fig . 4 shows the connection to the bottom of the
receiver .
If the liquid from the condenser is connected to
the top of the receiver (fig . 5), a slightly different
arrangement must be made .
The liquid line (b) from the condenser to the
receiver will need to have a goose neck/liquid
trap to secure the additional liquid column to be
established .
While air is heavier than ammonia gas, the air will
collect in two locations in this type of installation:
On top of the liquid in the receiver (x) or on top
of the liquid in the drop leg from the condenser
(y) .
© Danfoss | DCS (hhr) | 2019.02
