Marine Heat Exchanger(DC-90S)
This page describes our DC range of oil coolers which are designed for use on small marine transmissions. They have the same cupro-nickel tubes as our larger EC to PK range of oil coolers and therefore have the same long life expectancy.
The seawater connections are neoprene mouldings making them simple and easy to install and should cleaning be necessary, they can be removed using only a screwdriver. We can select by computer the appropriate oil cooler for a particular duty from the following information.
The seawater connections are neoprene mouldings making them simple and easy to install and should cleaning be necessary, they can be removed using only a screwdriver. We can select by computer the appropriate oil cooler for a particular duty from the following information.
oil type or its viscosity at a specified temperature cSt at °C
heat to be dissipated kW
oil flow liter/min
oil inlet temperature °C
seawater temperature °C
seawater flow liter/min
If this information is not available, a selection can be made using the table below. In many cases we will have on file information which will enable us to select a suitable oil cooler for a particular engine and gearbox combination. Two oil connection sizes are available and three seawater pipe sizes which can be either in line or at right angles to the axis of the cooler. If preferred, the oil coolers can be supplied without end covers for incorporating directly into the seawater pipework.
Performance data of DC oil coolers
Typical examples of oil coolers fitted to marine transmissions with an oil inlet temperature of 80°C and a sea water temperature of 32°C.
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Cooler Type
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Maximum sea water flow for end cover code internal oil volume
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Suitable for gearbox transmitting
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||||
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1"
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1 1/4"
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1 1/2"
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Direct connector
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Liter/min
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Liter/min
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Liter/min
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Liter/min
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kW
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HP
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DC 50
DC 60
DC 90
DC120
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60
60
60
60
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90
90
90
90
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120
120
120
120
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180
180
180
180
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75
120
150
180
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100
160
200
240
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Design Parameter
Maximum working pressure on oil side: 25 bar
Maximum working pressure on water side: 3 bar
Maximum working temperature: 125°C
Specification and dimension of oil coolers
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A(mm)
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B(mm)
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C(BSP)
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D(mm)
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E(mm)
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Internal oil volume(ml)
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Internal water volume(ml)
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DC 50
DC 60
DC 90
DC120
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136
176
256
356
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102
142
222
322
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1/2" or 3/8"
1/2" or 3/8"
1/2" or 3/8"
1/2" or 3/8"
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1", 1 1/4" , 1 1/2"
1", 1 1/4" , 1 1/2"
1", 1 1/4" , 1 1/2"
1", 1 1/4" , 1 1/2"
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236
276
356
456
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80
105
160
200
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160
200
240
325
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Operation and Maintenance of Coolers
No oil cooler manufacturer can guarantee that his products will have an indefinite life and for this reason, we suggest that the cooling system is
designed to minimise any damage caused by a leaking oil cooler.
This can be achieved as follows:
1. The oil pressure should be higher than the sea water pressure, so that in the event of a leak occurring, the oil will not be contaminated.
2. When the hydraulic system is not being used, the coolers should be isolated from sea water pressure.
3. The sea water outlet pipe from the cooler should have a free run to waste.
4. Stainless steel sea water pipes and fittings should not be used adjacent to the oil cooler.
5. Ensure maximum stated flow rates are not exceeded.