Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
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Note 35
For HPC compressors released for 50 bar design pressure (Mk 4 LL or newer), the
max. settings for discharge pressure high alarm and high shutdown are raised to
44.0/45.0 bar.
For HPC compressors released for 40 bar design pressure (Mk 4 or older), the
max. settings for discharge pressure high alarm and high shutdown are 40.0/40.0
bar.
For HPC/HPO compressors, the present max. setting for high alarm limit is 44.0
bar and the present max. setting for high shutdown limit is 45.0 bar.
When using R600 as refrigerant, these limits are lowered to: high alarm limit 35.5
bar and high shutdown limit 36.0 bar.
Note 36
For SAB 193 H, 233 H, 283 H, 355 H and SAB 273 S, the
Oil balance reduction
pressure
is calculated as follows:
Oil balance reduction pressure = Discharge pressure (abs) - Oil pressure 2 (abs).
The oil pressure 2 is measured at the compressor balance piston port (SB-2).
The
Oil balance reduction pressure function
is optional and must be enabled in
Configuration - Parameter
Balance pressure reduction
(Yes/No).
Note 37
For SAB 193 H, 233 H, 283 H, 355 H and SAB273 S, the
Discharge temperature
difference
is calculated as follows:
Discharge temperature difference = Discharge temperature - Oil temperature.
Alarm monitoring is only active when the compressor is operating at full capacity,
defined as capacity >/= 98%.
The alarm default limit and min. and max. limits depend on whether the
Oil flow
control
function is enabled.
At compressor start, alarm monitoring is delayed as set in the
Discharge diff. start
timer. When the
Discharge diff. start
timer has run out, the alarm is further delayed
during operation as set in the
Discharge diff. delay
timer.
The
Discharge temperature difference
function is optional and must be enabled in
Configuration - Parameter
Oil flow control
(Yes/No).
Note 38
The
Suction Pressure gradient
is calculated as follows:
Suction pressure gradient = dP
suction
/ dt
The
Suction pressure gradient
function is optional for all compressor types and must
be enabled in Configuration - Parameter
Suct. press. grad
(Yes/No).
Note: For screw types SAB 193 H, 233 H, 283 H, 355 H, SAB 157 HR and SAB 273
S and for reciprocating types HPC, HPO, HPX using refrigerant R717, the
Suct.
press. grad
parameter is enabled as default.
For more information on how to set appropriate alarm and shutdown limits for the
Suction pressure gradient
function; see
6.4.3 Compressor block, 22: Suction press.
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