Preparations
12
Operating instructions for the natural gas-fuelled CHP module
VITOBLOC 200
6130329
GB
2.1.2
Engine lubrication oil
Principles
The use of lubrication oil that the CHP module manu-
facturer specifies for the relevant type of gas is a
prerequisite for the safe and wear-resistant operation
of the engine. Especially in view of possible warranty
claims in a case of damage, we like to emphasize the
opera
tor’s duty of care.
The service life of the lubrication oil depends on the
operating conditions, especially
-
the gas quality,
-
the ambient conditions,
-
the operating mode of the CHP module and
-
the quality of the lubrication oil.
The contaminants contained in special types of gas,
such as dumpsite gas and biogas, can considerably
reduce the service life of the lubrication oil.
It is necessary to establish the relevant changing
interval by analyzing the old oil, with the first of these
analyses being carried out during the first mainte-
nance, or in the case of special types of gas, after
approx. 400, 1,000 and 2,000 operating hours.
Please note that also the trends of several analyses
must be taken into consideration when assessing the
wear and tear, apart from complying with the limits as
such. The following characteristic values need to be
analyzed and recorded:
designation
unit
measuring method
viscosity
mm²/sec (cSt)
DIN 51 366, ASTM D 445.
DIN EN ISO 3104, (DIN 51 562-1*)
water content
%
DIN 51 366, ASTM D 1744.
(EN ISO 12937*)
glycol content
ppm
DIN 51 375, ASTM D 4291
TBN (total base number)
% or mgKOH**/g
ISO 3771
TAN (total acid number)
acc. to TBN
ASTM 664
SAN (strong acid number)
mgKOH**/g
ASTM 664
i ph (Initial ph value)
on request
oxidation 5.8 µm
A/cm
DIN 51 451
nitration 6.1 µm
A/cm
DIN 51 451
wearing metals
aluminium
mg/kg
DIN 51 396-2
chromium
mg/kg
DIN 51 396-2
copper
mg/kg
DIN 51 396-2
iron
mg/kg
DIN 51 396-2
lead
mg/kg
DIN 51 396-2
tin
mg/kg
DIN 51 396-2
silicon
mg/kg
DIN 51 391, ASTM D 5185
sodium
mg/kg
DIN 51 396-2
* CHP module with MAN engine
** potassium hydroxide
Table 4 Characteristic values of a lubrication oil analysis