2.4.2
Lube-Oil Sensors
Each engine shall be equipped with lube-oil temperature and pressure
sensors. Temperature sensors shall provide signals for pre-high and high
lube-oil indication and alarms. Pressure sensors shall be located
downstream of the filters and provide signals for pre-low and low lube-oil
indication and alarms.
2.4.3
Lubricating Oil Strainer
A full-flow, oil strainer shall be furnished in-line, ahead of the engine.
The strainer shall be as recommended by the engine manufacturer. A bottom
drain plug shall allow easy removal of the sludge.
2.4.4
[Pre-Lubrication Oil Pump
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NOTE: Normally, engine size greater than 350 kW
(470 hp) and engines with a period in excess of two
weeks between operations require pre-lubrication.
If pre-lubrication is required, utilize this
paragraph.
**************************************************************************
The pre-lubricating oil pump shall have a capacity and head rating as
recommended by the engine manufacturer. The pump shall incorporate a
built-in relief valve and be directly connected to an electric motor with
the motor-pump assembly mounted on a common case iron or steel base. The
pump shall be furnished complete and ready for operation with all controls
inclusive. The pre-lubrication pump shall completely fill the engine oil
lines and establish lubricating oil pressure prior to starting. The pump
motor shall be in accordance with the requirements of paragraph MOTORS.]
2.5
COOLING SYSTEM
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NOTE: There are three basic types of engine cooling
systems available. These are systems using
liquid-to-air heat exchangers (radiators) or cooling
towers, systems using liquid-to-liquid heat
exchangers (systems using shell and tube, plate and
frame heat exchangers) and systems using submerged
pipe systems. No matter which system is specified,
engine outlet water temperature should be kept
constant, and the differential between inlet water
to outlet water of the cooling system should be kept
at about 8 degrees C (15 degrees F). The radiator
requires forced air through the heat exchanger
causing higher noise levels. For an indoor
application, the radiator can be located outside
with a higher pressure pumping system to deliver the
required flow to the radiator. The radiator should
be mounted less than 15 m (50 ft) above the engine
to avoid leakage at the engine water pump seal.
When the approach between coolant and air
temperatures is under 15 degrees C (27 degrees F),
towers become more economical. A surrounding clean
environment is required with towers due to the
SECTION 15133A
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