Fasterns and Parts of Marine Diesel Engines | Esquemas Literatura Inglesa

The Sulzer RTA68T-B type engine is a low-speed, direct-reversible, single-acting, two-

stroke engine, comprising crosshead-guided running gear, hydraulically operated poppet-

type exhaust valves, turbocharged uniflow scavenging system and oilcooled pistons.

The Sulzer RTA68T-B is designed for running on a wide range of fuels from marine diesel

oil (MDO) to heavy fuel oils (HFO) of different qualities.

Main features:

Bore 680 mm

Stroke 2720 mm

Number of cylinders 5 to 8

Main parameters (R1):

Power (MCR) 2940 kW/cyl

Speed (MCR) 94 rpm

Mean effect. press. 19.0 bar

Mean piston speed 8.5 m/s

The Sulzer RTA68T-B is available with five to eight cylinders rated at 2940 kW/cyl to

provide a maximum output of 23 520 kW for the eight-cylinder engine (primary engine

data on table A1).

Overall sizes of engines 5 cyl. 8 cyl.

Length [m] 8.2 11.7

Height [m] 11.9 11.9

Dry weight [t] 412 593

The development of the RTA68T-B range to provide an engine for the marine market

concentrated around providing power and reliability at economic service speeds. The well-

proven bore-cooling principle for pistons, liners, cylinder covers and exhaust valve seats is

incorporated with variable injection timing (VIT) which maintains the nominal maximum

combustion pressure within the Power range compliant with the IMO regulation.

Refer to figure and the following text for the characteristic design features:

1. Semi-built crankshaft.

2. Sturdy engine structure with low stresses and high stiffness comprising A-shaped

fabricated double-wall columns and cylinder blocks attached to the bedplate by pre-

tensioned vertical tie rods.

3. Fully built-up camshaft driven by gear wheels housed in a double column located at the

driving end.

4. White-metalled type bottom-end bearings.

5. Standard pneumatic control – fully equipped local control stand. Diesel Engine CoNtrol

and optImizing Specification (DENIS-6), standard set of sensors and actuators for control,

safety and alarms. Speed control system according to section H2.2.

6. Crosshead with crosshead pin and singlepiece white metal large surface bearings.

Elevated pressure hydrostatic lubrication.

7. Special grey cast iron, bore-cooled cylinder liners with load dependent cylinder

lubrication.

8. Solid forged or steel cast, bore-cooled cylinder cover with bolted-on exhaust valve cage

containing Nimonic 80A exhaust valve.

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The Sulzer RTA68T-B type engine is a low-speed, direct-reversible, single-acting, two- stroke engine, comprising crosshead-guided running gear, hydraulically operated poppet- type exhaust valves, turbocharged uniflow scavenging system and oilcooled pistons.

The Sulzer RTA68T-B is designed for running on a wide range of fuels from m arine d iesel o il (MDO) to h eavy f uel o ils (HFO) of different qualities.

Main features: Bore 680 mm Stroke 2720 mm Number of cylinders 5 to 8

Main parameters (R1): Power (MCR) 2940 kW/cyl Speed (MCR) 94 rpm Mean effect. press. 19.0 bar Mean piston speed 8.5 m/s

The Sulzer RTA68T-B is available with five to eight cylinders rated at 2940 kW/cyl to provide a maximum output of 23 520 kW for the eight-cylinder engine (primary engine data on table A1).

Overall sizes of engines 5 cyl. 8 cyl. Length [m] 8.2 11. Height [m] 11.9 11. Dry weight [t] 412 593

The development of the RTA68T-B range to provide an engine for the marine market concentrated around providing power and reliability at economic service speeds. The well- proven bore-cooling principle for pistons, liners, cylinder covers and exhaust valve seats is incorporated with v ariable i njection t iming (VIT) which maintains the nominal maximum combustion pressure within the Power range compliant with the IMO regulation.

Refer to figure and the following text for the characteristic design features:

Semi-built crankshaft.
Sturdy engine structure with low stresses and high stiffness comprising A-shaped fabricated double-wall columns and cylinder blocks attached to the bedplate by pre- tensioned vertical tie rods.
Fully built-up camshaft driven by gear wheels housed in a double column located at the driving end.
White-metalled type bottom-end bearings.
Standard pneumatic control – fully equipped local control stand. D iesel E ngine Co N trol and opt I mizing S pecification (DENIS-6), standard set of sensors and actuators for control, safety and alarms. Speed control system according to section H2.2.
Crosshead with crosshead pin and singlepiece white metal large surface bearings. Elevated pressure hydrostatic lubrication.
Special grey cast iron, bore-cooled cylinder liners with load dependent cylinder lubrication.
Solid forged or steel cast, bore-cooled cylinder cover with bolted-on exhaust valve cage containing Nimonic 80A exhaust valve.

Constant-pressure turbocharging system comprising exhaust gas turbochargers and auxiliary blowers for low-load operation.
Oil-cooled piston with bore-cooled crowns and short piston skirts. TriboPack designed as standard feature for excellent piston running and extended TBO up to 3 years.
Uniflow scavenging system comprising scavenge air receiver with non-return flaps.
Rigid cast iron cylinder monoblock or iron jacket moduls bolted together to form a rigid cylinder block.
Main bearing cap tightened with down bolts for easier assembly and disassembly of whitemetalled shell bearings.
A combined injection pump and exhaust valve actuator unit for two cylinders each. Camshaft driven fuel pump with double spill valves for timing fuel delivery to uncooled injectors. Camshaft-driven actuator for hydraulic drive of poppet-type exhaust valve working against an air spring.
Welded bedplate with integrated thrust bearings and large surface main bearing shells.

Fasterns and Parts of Marine Diesel Engines, Esquemas de Literatura Inglesa

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