6. LUBE OIL SYSTEM
7.4 Cooling water system
7.4.1 General
The high temperature (HT) system provides the HT side of the charge air cooler and the engine‘s cylinder heads and cylinder liner water rings with cooling water. In order to reduce the thermal tension in
water-cooled engine parts, it is important to keep the drop in temperature low and therefore the m ow high.
Therefore the fresh water pump (l tted on engine) HT (FP1) delivers its full m ow over the engine. The HT outlet temperature of 90 °C is controlled by the temperature control valve HT (FR1). In case the
temperature decreases, the valve delivers more water to the bypass (connection B for mechanical, connection 3 for electrical driven valves) back to the HT pump‘s suction side.
In order to use the thermal energy of the HT circuit, a heat recovery can be installed as shown in the cooling water diagrams (FH3). For heat recoveries, especially for fresh water generators a high m ow over the heat consumer (FH3) is recommended. This can be achieved by using a m ow temperature control valve HT (FR3). This valve raises the HT m ow temperature and therefore reduces the amount of water that is circulated over the bypass of FR1 and increases the m ow through the heat recovery heat consumer (FH3) and the fresh water cooler HT (FH1).
TT
ENGINE
TI
TI TI
TI
TSHH
PI
2211 2212
C37 C25
DH1 FR1
FR6
b CR1
M 13
2 C15
TI LH1TI 1
2 3M
FR3 FH1
TI TI
TI TI
A
B C
TI TI
TI TI A
B C
FR2
FH2
PI PI
PI PI
SP1 SP2
SF1
ST1 TI
TI TI
TI TI TI
FH4 DH3 LH3
TI TI
C14 C16
FH5 FP7
PI PT PSL 21122111
C31 PI
e f
PI
CH2 CR3 CH1 TT 2201
PI FP5 PI C21 FP1
PI C22 FP2 PI C28
PT PSLL PSL 2103 2101 2102 FT1
FT2
d LI LI
LSL LSL
Anti corrosion treatment
PI PI FP6
TI FH3 TI
02 03 04 05
07 06
08 09 10 11 12 13 14 15 16 17 18 19 20 21 22
The low temperature (LT) cooling circuit provides cooling for the LT stage of the charge air cooler, the lube oil and the diesel oil coolers and possible other consumers like e.g. gear box and generator coolers.
The LT m ow temperature is controlled by FR2. The cooling system is laid out for 38 °C under tropical conditions and full engine load. For better performance, the LT temperature is to be controlled to 32 °C.
Caterpillar Motoren can deliver mechanic P-controllers with a set point range of 20 to 30 °C or electric driven valves with electronic controllers, which must be set to 32 °C.
Depending on the plant design the fresh cooling water pumpsand the seawater pump can be l tted on the engine. All cooling water pumps may be also designed as separate with electrical drive.
Cooling water system diagram
Fig. 7-1 External cooling water system, system diagram, turbocharger at driving end
In plants with skin or box coolers not required: seawater system (SP1, SP2, SF1, ST1).
02 03 04 05
07 06
08 09 10 11 12 13 14 15 16 17 18 19 20 21 22
CH1 Charge air cooler HT CH2 Charge air cooler LT
CR1 Charge air temperature control valve CR3 Sensor for charge air temperature control valve
DH1 MDO preheater
DH3 Fuel oil cooler for MDO operation FH1 Fresh water cooler HT
FH2 Fresh water cooler LT FH3 Heat consumer FH4 Other LT consumers FH5 Fresh water preheater
FP1 Fresh water pump (l tted on engine) HT FP2 Fresh water pump (l tted on engine) LT FP5 Fresh water stand-by pump HT FP6 Fresh water stand-by pump LT FP7 Preheating pump
FR1 Temperature control valve HT FR2 Temperature control valve LT FR3 Flow temperature control valve HT FR6 Sensor for temperature control valve FT1 Compensation tank HT
FT2 Compensation tank LT LH1 Lube oil cooler LH3 Gear lube oil cooler SF1 Seawater l lter SP1 Seawater pump
SP2 Seawater stand-by pump ST1 Sea chest
LI Level indicator LSL Level switch low PI Pressure indicator PSL Pressure switch low PSLL Pressure switch low PT Pressure transmitter TI Temperature indicator TSHH Temperature switch high TT Temperature transmitter C14 Charge air cooler LT, inlet C15 Charge air cooler LT, outlet C16 Charge air cooler HT, inlet C21 Freshwater pump HT, inlet C22 Freshwater pump LT, inlet C25 Cooling water, engine outlet C28 Fresh water pump LT, outlet C31 Fresh water pump HT, outlet C37 Vent
b Measurement min. 2.0 m distance to C17 d Min. 4 m and max. 12 m above engine center
e Bypass DN 12 f Drain
FT1
Anti corrosion treatment
ENGINE
LI
A
PSLL 2211
FT2
LI LSL
d
LSL TI FH3 TI
FH1
TI TI
TI TI
FR3
C B
FH2
TI TI
TI TI
FR2 A C B
LH1
TI TI
CR1 3 2 1
C15 C25 bTI
TI TI
DH1 FR1 A
C B
C37
C21 C23 C14 C1
CH1 CH2 CR3 h
PI
TI TSHH
TT
2212
210321012102 2201
PSL PT TT
FP1 SP4
2112 2111 PT PSL
PI C3
PI
e f
PI PI
FP5
FH5
FP7 FP6
PI PI
PI PI
FP4
TI TI
ST1 SF1
SP2
PI PI
PI PI
TI TI TI
TI TI TI
DH3 LH3 FH4
02 03 04 05
07 06
08 09 10 11 12 13 14 15 16 17 18 19 20 21 22
Turbocharger at free end
Fig. 7-2 External cooling water system, system diagram, turbocharger at free end
In plants with skin or box coolers not required: Seawater system (SP1, SP2, SF1, ST1).
02 03 04 05
07 06
08 09 10 11 12 13 14 15 16 17 18 19 20 21 22
CH1 Charge air cooler HT CH2 Charge air cooler LT
CR1 Charge air temperature control valve CR3 Sensor for charge air temperature control valve
DH1 MDO preheater
DH3 Fuel oil cooler for MDO operation FH1 Fresh water cooler HT
FH2 Fresh water cooler LT FH3 Heat consumer FH5 Fresh water preheater
FP1 Fresh water pump (l tted on engine) HT FP4 Fresh water pump (separate) LT FP5 Fresh water stand-by pump HT FP6 Fresh water stand-by pump LT FP7 Preheating pump
FR1 Temperature control valve HT FR2 Temperature control valve LT FR3 Flow temperature control valve HT FT1 Compensation tank HT
FT2 Compensation tank LT LH1 Lube oil cooler LH3 Gear lube oil cooler SF1 Seawater l lter
SP2 Seawater stand-by pump SP4 Seawater pump (l tted on engine) ST1 Sea chest
LI Level indicator LSL Level switch low PI Pressure indicator PSL Pressure switch low PSLL Pressure switch low PT Pressure transmitter TI Temperature indicator TSHH Temperature switch high TT Temperature transmitter (PT100) C1 Seawater pump, inlet
C3 Seawater pump, outlet C14 Charge air cooler LT, inlet C15 Charge air cooler LT, outlet C21 Freshwater pump HT, inlet C23 Stand-by pump HT, inlet C25 Cooling water, engine outlet C37 Vent
b Measurement min. 2.0 m distance to C17 d Min. 4 m and max. 12 m above engine center
e Bypass DN12 f Drain
h Please refer to the measuring point list regarding design of the monitoring devices.
ENGINE
TI FH3 TI
TI TILH1 CR11
2
M 3 C15
k
TI FH2
TI
TI TI
FR2A
B C
SP1
PI PI
PI PI SP2
SF1
ST1 FH4
TI TI TI
TI TI TI
LH3 DH3 PI PT PSL
2111 2112
C14 CH2 CR3 CH1
TI TI FH5
FP7 PI PI FP5
e f C23 C21
C22
PI PI
FP1 C28 FP2
PI
PI PI FP6
PI TT TI
PT TT
PSL PSLL
210321012102 2201
TSHH 2212
C25 bTI TI
TI DH1
FR1 A
B C
C37 LI
FT2
LSL
Anti corrosion treatment
02 03 04 05
07 06
08 09 10 11 12 13 14 15 16 17 18 19 20 21 22
Secondary circuit cooling system with turbocharger at free end
Fig. 7-3 Secondary circuit with turbocharger at free end, system diagram
02 03 04 05
07 06
08 09 10 11 12 13 14 15 16 17 18 19 20 21 22
CH1 Charge air cooler HT CH2 Charge air cooler LT
CR1 Charge air temperature control valve CR3 Sensor for charge air temperature control valve
DH1 MDO preheater
DH3 Fuel oil cooler for MDO operation FH2 Fresh water cooler LT
FH3 Heat consumer FH4 Other LT consumers FH5 Fresh water preheater
FP1 Fresh water pump (l tted on engine) HT FP2 Fresh water pump (l tted on engine) LT FP5 Fresh water stand-by pump HT FP6 Fresh water stand-by pump LT FP7 Preheating pump
FR1 Temperature control valve HT FR2 Temperature control valve LT FT2 Compensation tank LT LH1 Lube oil cooler LH3 Gear lube oil cooler SF1 Seawater l lter SP1 Seawater pump
SP2 Seawater stand-by pump ST1 Sea chest
LI Level indicator LSL Level switch low PI Pressure indicator PSL Pressure switch low PSLL Pressure switch low PT Pressure transmitter TI Temperature indicator TSHH Temperature switch high TT Temperature transmitter (PT100) C14 Charge air cooler LT, inlet C15 Charge air cooler LT, outlet C21 Freshwater pump HT, inlet C22 Freshwater pump LT, inlet C23 Stand-by pump HT, inlet C25 Cooling water, engine outlet C28 Fresh water pump LT, outlet C37 Vent
b Measurement min. 2.0 m distance to C17 e Bypass DN 12
f Drain
k Distance min. 1 m