Diesel engines used in Eureka fire water systems are designed to operate in an offshore/marine environment. The diesel engine is skid mounted, coupled with the driven unit. For each project diesel engines are selected to meet the specified power requirements of the driven unit. The engines will normally run at 1500/1800 rpm depending on the application.
The typical engine configuration consists of:
- Grey cast-iron crankcase with inspection ports
- GFlywheel and flywheel housing
- GWater cooled exhaust gas manifolds and turbo chargers
- GCommon-Rail fuel injection system with low and high pressure fuel pumps
- GClosed crankcase ventilation system
- GDual starter system, electric, hydraulic, pneumatic, or any combination of these
- GEngine driven coolant circulation pump and coolant thermostat for jacket coolant circuit
- GEngine driven coolant circulation pump and coolant thermostat for charge air coolant circuit
- GIntegrated electronic engine control module (ECM) and monitoring system for:
- Engine speed control
- Engine monitoring and display of engine operating parameters and alarms
- Engine protection against critical operating parameters
- Automatic start sequence control
- Communication with external system, typically a Eureka PLC in the local control panel
- Safety shut-down override mode in Fire/Emergency/Essential mode
- Redundant ECM is available to comply with the requirements of NFPA 20.
The two diesel engine exhaust outlets are supplied with exhaust bellows to isolate vibration and absorb thermal expansion. Exhaust could be routed separately or joined with a Y piece to one common outlet.
Eureka offers various products for treatment of exhaust gases, all of which are sized and designed for the specific application and according to customer specifications.
- Silencer with spark arrestor designed to reduce the noise level to a required maximum.
- Exhaust cooler to reduce temperatures to a specified level, along with accessories including expansion tank for cooling liquid, circulation pump and pump motor.
Surface treatment Diesel Engine
Painting will be to engine manufacturer’s marine and offshore standard.
The engine cabling is manufacturer standard cabling for offshore/marine environment, and as part of the type approval and cannot be altered. The cables are of flame retardant type.
The fuel system of the engine is typically comprised by a skid mounted switchable dual fuel pre-filter, with water separator and water-level sensor, a duplex fuel main filter and a high pressure pump to supply the common rail injection system. There are interfaces to a diesel day tank with one supply and one return line. The fuel return line is routed via a plate type heat exchanger to remove excess heat.
Lube oil system
The entire lube oil system is integral in the engine, cooled by the jacket water. The system ensures proper lubrication of the whole engine. Eureka normally includes a dual by-pass centrifugal filter in addition to the standard spin-on type filter elements configuration, for additional filtration of fine particles and by that increase the reliability. Oil level can be measured by means of a dip stick.
Combustion air inlet system
For air intake there are different solutions. There is the option of standard diesel engine manufacturer dry air filters mounted on the air intake of the engine, a setup used when the ambient air is used for combustion. More often Eureka will supply a custom combined air filter/silencer with interfaces for ducting for supply of combustion air from elsewhere on the installation. The filter/silencer will be in a material suitable for the application and according to customer specifications. For containerized solutions, the air filter is normally located inside the container, whereas with non-containerized solutions, the air filter is normally loose supplied.
One important safety measure of the diesel engine is the air flaps found on the air intake, to cut off air supply and shut off the diesel engine in case of over speed/presence of gas or other causes for emergency stops. The 24V power to the air flaps is derived from a source not affected by isolation of the system from the rest of the installation; to ensure the means for emergency stop are available should it be needed. The air flaps have a closed end switch feedback, and must be manually reset.
The engine has a 2-circuit cooling system. There is one circuit for charge air cooling and one jacket water circuit for cooling of the engine block, both of which are circulated by an engine driven mechanical pump. To remove the heat from the system, an external means of cooling is required. This is typically a skid-mounted plate heat exchanger. To compensate for thermal expansion of the cooling liquid, Eureka supplies expansion tanks, equipped with level switches for monitoring.
Eureka recommends a pre-heating arrangement for the diesel engine. The purpose of pre-heating is to maintain an even temperature to reduce wear during start up with low ambient temperature.
This consists of a skid-mounted pump, motor and heater, suitably sized for the total volume of the cooling system. The heater is equipped with thermostats for control and shutdown.