5.5.2.3 Mineral oils
Mineral oils containing special additives (diesel engine oils)
must have a Total Base Number (marked TBN or BN)
strictly below 40 mgKOH/g
5.5.2.4 Oil filtering and pollution
Following indications are related to the maximum
acceptable oil pollution level and to the oil filtering level
(filter efficiency) which has to be installed to obtain a clean
oil
Refer to Section 1 to get data about the used bearing
The viscosity change must remains /- 10% of a
fresh oil lubricant
Acid Number (TAN) : must not exceed 2
Acidity change must remains (TAN) +/- 0.5 mg KOH/g of a
fresh oil lubricant
Humidity ratio must remains below 0.05 %
This paragraph applies to bearings designed for high axial
thrust (tilting pads technology as used in bearings type
.....A).or oil lubricated anti friction bearing :
Maximum acceptable pollution:
following ISO 4406 : 17/15/12
following NAS 1638 classe 7
Filtering level to ensure :
following ISO 16889 :
100
)
(
10
=
c
β
(filtering 10
μ)
This paragraph applies to standard bearings with low axial
thrust , self lub or oil circulation (as types E..Z.K ; E..Z.Q) :
Maximum acceptable pollution:
following ISO 4406 : 18/16/13
following NAS 1638 class 9
Filtering level to ensure (oil circulation bearing):
following ISO 16889 :
100
)
(
25
=
c
β
(filtering 25
μ)
5.6 Not applicable
5.7 Not applicable
5.8 BOLT TIGHTENING
5.8.0 General
It is recommended to use a Liquid thread lock compound
on any fixing screws, or plugs (except for electrical contact)
which have been untighten or dismantled during any
operation.
A medium strength thread locker as or similar as "Loctite
242" ; or "Omnifit 100M" (from Henkel)
5.8.1 Steel screw in steel tapping
If no torque value is specified into the concerned chapter
the following values can be used for fixation of parts metal
onto metal
Bolt : Steel / Steel
(with medium strength thread locker)
Ø nominal
(mm)
Torque
(N.m)
Ø nominal
(mm)
Torque
(N.m)
3
1,0
18
222
4
2,3
20
313
5
4.6
22
430
6
7.9
24
540
8
19.2
27
798
10
37.7
30
1083
12
64.9
33
1467
14
103
36
1890
16
160
5.8.2 Plugs
If no torque value is specified into the concerned chapter
the following values can be used for plugs tightening
Steel and copper alloy Plugs
(medium strength thread locker)
Ø nominal
(inches)
Torque
(N.m)
Ø nominal
(inches)
Torque
(N.m)
G3/8
30
G1 ¼
160
G1/2
40
G1 ½
230
G3/4
60
G2
320
G1
110
G2 ½
500
Electric Power Generation
Installation and maintenance
5654
en - 2017.
10
/
a
LSA 5
2
.2
MHV
Industrial Range Alternators
- 4 pole
28
