Bedienungs- und Installationsanleitung
Installation- and Operation Instruction
Kühl- / Filteraggregat / Off-Line Filter / Cooler Unit
FGSL
20
BX270001, 10/2010 Art. Nr.90 31 065
Example for oil VG 46:
V
40
= 46 mm²/s, T = 25 °C
4325
,
842
23
,
0
46
Ln
159
b
=
∗
=
08801
,
0
e
23
,
0
a
877
4325
,
842
=
∗
=
−
cSt
,
e
,
υ
35
97
08801
0
2
95
25
4325
842
=
∗
=
+
,
,
3.3.2 Table for Operating Viscosity for VG Oil
10 °C
20 °C
30 °C
40 °C
50 °C
60 °C
70 °C
80 °C
90 °C
VG 46
264,45
131,96
73,58
46,00
29,13
20,04
14,43 10,78 8,32
VG 68
444,77
210,85
112,61
68,00
41,63
27,86
19,58 14,32 10,84
VG
220
2.120,17 861,60 404,31 220,00
121,71
74,99
49,00 33,61 24,01
VG 320 3.489,92 1.350,22
607,96
320,00
171,40
102,85
65,66 44,12 30,94
Viscosity given in mm²/s
3.3.3 Calculating Pressure Loss
For straight, smooth piping the pressure loss per meter can be calculated for laminar flow using the
following formula:
2
DN
V
S
32
,
0
PV
∗
∗
∗
=
υ
υ
= viscosity (mm²/s)
Example:
S = spec. gravity (kg/dm³)
υ
= 97.35 mm²/s
DN = Pip diameter (mm)
S
= 0.8817 kg/dm³
PV = Pressure loss (bar)
DN = 20 mm
V = Velocity of flow (m/s)
V
= 3.18 m/s (60 l/min for pipe DN 20)
bar
22
,
0
20
18
,
3
8817
,
0
35
,
97
32
,
0
PV
2
=
∗
∗
∗
=
Summary of Contents for FGSL 15
Page 33: ......
