Man B&W S80ME-C7, Project Manual

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MAN B&W 1.06
Page 5 of 5
MAN Diesel
MAN B&W ME/MEC engines 198 46 139.4
Exhaust Valve
The exhaust valve consists of the valve housing
and the valve spindle. The valve housing is made
of cast iron and is arranged for water cooling. The
housing is provided with a water cooled bottom
piece of steel with a flame hardened seat. The ex-
haust valve spindle is made of Nimonic. The hous-
ing is provided with a spindle guide.
The exhaust valve is tightened to the cylinder
cover with studs and nuts. The exhaust valve is
opened hydraulically by the electronic valve acti-
vation system and is closed by means of air pres-
sure.
The operation of the exhaust valve is controlled
by the proportional valve which also activates the
fuel injection.
In operation, the valve spindle slowly rotates, driv-
en by the exhaust gas acting on small vanes fixed
to the spindle.
Indicator Cock
The engine is fitted with an indicator cock to
which the PMI pressure transducer can be con-
nected.
MAN Diesel Alpha Cylinder Lubricator
The electronically controlled Alpha cylinder lubri-
cating oil system, used on the MC engines, is ap-
plied to the ME engines, and controlled by the ME
Engine Control System.
The main advantages of the Alpha cylinder lubri-
cating oil system, compared with the conventional
mechanical lubricator, are:
• Improved injection timing
• Increased dosage flexibility
• Constant injection pressure
• Improved oil distribution in the cylinder liner
• Possibility for prelubrication before starting.
More details about the cylinder lubrication system
can be found in Chapter 9.
Gallery Arrangement
The engine is provided with gallery brackets,
stanchions, railings and platforms (exclusive of
ladders). The brackets are placed at such a height
as to provide the best possible overhauling and
inspection conditions.
Some main pipes of the engine are suspended
from the gallery brackets, and the topmost gallery
platform on the manoeuvring side is provided with
overhauling holes for the pistons.
The engine is prepared for top bracings on the ex-
haust side, or on the manoeuvring side.
Piping Arrangements
The engine is delivered with piping arrangements
for:
• Fuel oil
• Heating of fuel oil pipes
• Lubricating oil, piston cooling oil and
hydraulic oil pipes
• Cylinder lubricating oil
• Cooling water to scavenge air cooler
• Jacket and turbocharger cooling water
• Cleaning of turbocharger
• Fire extinguishing in scavenge air space
• Starting air
• Control air
• Oil mist detector
• Various drain pipes.
All piping arrangements are made of steel piping,
except the control air and steam heating of fuel
pipes, which are made of copper.
The pipes are provided with sockets for local
instruments, alarm and safety equipment and,
furthermore, with a number of sockets for supple-
mentary signal equipment. Chapter 8 deals with
the instrumentation.