WÄRTSILÄ WARTSILA32, Product Manual, Page: 60 / 254

Cooling of the nozzles by means of lubricating oil is standard for HFO-installations, while the
nozzles for MDF-installations are non-cooled.
There is one fuel injection pump per cylinder with shielded high-pressure pipe to the injector.
The injection pumps, which are of the flow-through type, ensure good performance with all
types of fuel. The pumps are completely sealed off from the camshaft compartment.
Setting the fuel rack to zero position stops the fuel injection. For emergencies the fuel rack of
each injection pump is fitted with a stop cylinder. The fuel pump and pump bracket are adjusted
in manufacturing to tight tolerances. This means that adjustments are not necessary after
initial assembly.
The fuel injection pump design is a reliable mono-element type designed for injection pressures
up to 2000 bar. The constant pressure relief valve system provides for optimum injection,
which guarantees long intervals between overhauls. The injector holder is designed for easy
maintenance.
4.2.13 Lubricating oil system
The engine internal lubricating oil system include the engine driven lubricating oil pump, the
electrically driven prelubricating oil pump, thermostatic valve, filters and lubricating oil cooler.
The lubricating oil pumps are located in the free end of the engine, while the automatic filter,
cooler and thermostatic valve are integrated into one module.
4.2.14 Cooling water system
The fresh water cooling system is divided into a high temperature (HT) and a low temperature
(LT) circuit.
The HT-water cools cylinder liners, cylinder heads and the first stage of the charge air cooler.
The LT-water cools the second stage of the charge air cooler and the lubricating oil.
4.2.15 Exhaust pipes
The exhaust manifold pipes are made of special heat resistant nodular cast iron alloy.
The complete exhaust gas system is enclosed in an insulating box consisting of easily
removable panels. Mineral wool is used as insulating material.
4.2.16 Automation system
Wärtsilä 32 is equipped with a modular embedded automation system, Wärtsilä Unified Controls
- UNIC, which is available in two different versions. The basic functionality is the same in both
versions, but the functionality can be easily expanded to cover different applications.
UNIC C1 has a completely hardwired signal interface with the external systems, whereas UNIC
C2 and has hardwired interface for control functions and a bus communication interface for
alarm and monitoring.
All versions have en engine safety module and a local control panel mounted on the engine.
The engine safety module handles fundamental safety, for example overspeed and low
lubricating oil pressure shutdown. The safety module also performs fault detection on critical
signals and alerts the alarm system about detected failures. The local control panel has push
buttons for local start/stop and shutdown reset, as well as a display showing the most important
operating parameters. Speed control is included in the automation system on the engine (all
versions).
The major additional features of UNIC C2 are: all necessary engine control functions are
handled by the equipment on the engine, bus communication to external systems and a more
comprehensive local display unit.
Conventional heavy duty cables are used on the engine and the number of connectors are
minimised. Power supply, bus communication and safety-critical functions are doubled on
4-4 Wärtsilä 32 Product Guide - a21 - 7 September 2016
Wärtsilä 32 Product Guide 4. Description of the Engine