SABROE SAB 233 S User Manual

Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
54/175
008831 en 2022.02
Technical description
4.20 Oil carry-over to plant
Total oil carry-over estimate
Formula: 0.36 x total ppm value x total mass flow (kg/s) (COMP1) = > (kg/100 h)
The COMP1 calculation program provides the discharge temperature and the circulated mass
flow of refrigerant through evaporator, economiser and side load. In the formula, the total mass
flow (all single flow of refrigerant to be added provides condenser mass flow or total mass flow)
must be used.
The COMP1 calculation program also provides the oil separator load (%).
Total oil carry-over calculation
Oil vapour pressure calculation based on an empiric formula with good conformity to practice
experience:
Alternatively, use steam pressure from oil company.
Dalton’s law for partial pressure of two substances in vapour form gives good conformity with
practice experience.
Liquid oil aerosol carry-over depends on oil separator, oil separator challenge flow, refrigerant,
oil type, solubility, pressures and temperatures.
10
)
273
1
220*1 .1
1
(*)1270*12 (
+
-
+
+
=
Disch
tFp
Fp
oil
P
Fp = Flash point (Oil data) [°C]
t
disch
= Discharge temperature [°C]
[torr]
00133 .0*000 .000, ,1*
*
*
,
RefDisch
oiloil
oil
MP
MP
ppmVapour =
[ppm]
P
oil
= Oil vapour pressure [torr]
P
Disch
= Discharge pressure saturated [bar, a]
M
oil
and M
Ref
= Molecular weight for oil
and refrigerant [kmol/kg]
,
1
oil
ppmVapour =
1 + Oil separator load (%)
*
Vapour, ppm
oil
(Theoretical)
100
(Theoretical)
(Practical)
R717: Oil separator load (%) *
14
100
HC/HCFC/HFC: Oil separator load (%) *
25
100
Total oil carry-over (ppm) = Vapour (ppm) + liquid (ppm)
(Practical)

SABROE SAB 233 S Specifications

General

Brand	SABROE
Model	SAB 233 S
Category	Compressor
Language	English