MAN B&W S65ME-C8.2-GI-TII, Project Manual

Page: 353 / 395

MAN B&W 18.06
Page 5 of 6
MAN Diesel MAN B&W ME/MEC/ME/B/GI engines 199 01 97-5.0
LDCL Cooling Water Monitoring System
With the Load Dependent Cylinder Liner (LDCL)
cooling water system, the cooling water outlet
temperature from the cylinder liner is controlled
relative to the engine load, independent of the
cooling water outlet from the cylinder cover.
The interval for the liner outlet may be wide, for in-
stance from 70 to 130 degrees Celsius. The cool-
ing water outlet temperature is measured by one
sensor for each cylinder liner of the engine.
For monitoring the LDCL cooling water system the
following alarm and slow down functionality must
be fulfilled:
The Alarm system must be able, from one com-
mon analog sensor, to detect two alarm limits and
two slow down limits as follows:
• Upper slow down limit
• Upper alarm limit
• Load dependent slow down limit
• Load dependent alarm limit.
Fig. 18.06.02: Example of set points versus slow down and alarm limits for LDCL cooling water system
An example of the limits is shown in Fig. 18.06.02.
The load dependent limits must include at least
one break point to allow cut-in/-out of the lower
limits. The upper limits are fixed limits without
breakpoints.
The values of the load dependent limits are de-
fined as a temperature difference (
Δ
T) to actual
cooling water temperature (which vary relative to
the engine load).
The cooling water temperature is plant dependent
and consequently, the actual values of both upper
limits and load dependent limits are defined dur-
ing commissioning of the engine.
All 95-50ME-C10/9/-GI dot 2 and higher as well as
G50ME-B9.5/.3 and S50ME-B9.5 are as standard
specified with LDCL Cooling Water Monitoring
System while S50ME-B9.3 and G45ME-C9.5/-GI
are prepared for the installation of it.
178 68 07-4.0
50
60
70
80
90
100
110
120
130
140
0 10 20 30 40 50 60 70 80 90 100 110
Set points
Alarm
Slowdown
1st Break point
2nd Break point
Temperature, °C
Engine load, % MCR