English term (edited): booster turning gear ( for a turbine)

booster turning gear ( for a turbine) = Virador Hidráulico o Virador hidráulico con convertidor(o amplificador) de torque (de la turbina)

Referencias:

Virador:

El sistema virador consiste en un motor eléctrico o hidráulico (normalmente el segundo) que hace girar lentamente la turbina cuando no esta en funcionamiento. Esto evita que el rotor se curve, debido a su propio peso o por expansión térmica, en parada. La velocidad de este sistema es muy baja (varios minutos para completar un giro completo de turbina), pero se vuelve esencial para asegurar la correcta rectitud del rotor. Si por alguna razón este sistema se detiene (avería del rotor, avería de la turbina, inspección interna con desmontaje) es necesario asegurar que, antes de arrancar, estará girando varias horas con el sistema virador
Source:http://www.renovetec.com/partesturbinavapor.html


• Gas and steam turbine slow speed turning gears driven by electric or hydraulic motors
• Gas turbine starting systems using electric motors, hydraulic motors, diesel engines, expansion turbines, combustion turbines, etc.
• Starter drives to run up electrical generators to synchronous speed
• SSS Clutches can be supplied for fitting within a gearbox or for external mounting in their own casing.
• Clutch designs are available which will act as spacer type flexible couplings to accept misalignment or axial movement of the connected shafts.
Source: http://www.sssgears.com/auxiliarydrives/index.htm

The heart of Voith’s hydrodynamic
torque converter is its hydraulic
circuit; consisting of a pump, turbine,
and a guide wheel with adjustable
guide vanes (see picture above
right). This is combined in a common
housing filled with hydraulic oil.
The mechanical energy of the motor
is converted into hydraulic energy
through the pump wheel. In the
turbine wheel the same hydraulic
energy is converted back into
mechanical energy and transmitted
to the gas turbine/generator shaft.
The adjustable vanes of the guide
wheel regulate the mass flow in the
circuit. At closed guide vanes (small
mass flow) the power transmission
is at its minimum. With the guide
vanes completely open (large mass
flow), the power transmission is at
its maximum. Commonly, a constant
speed driver such as an induction
motor or a diesel engine drives the
pump wheel (input shaft of the
torque converter).
Guide Vanes
(adjustable)
Pump Wheel Turbine Wheel
Torque Converter
benefits, function and design
The Benefits Basic Design Hydrodynamic Torque Converter

Voith torque converters are designed and built
to meet customer requirements. No other torque
converter manufacturer offers this service.

Torsional vibration dampening and shock free
power transmission; consequently, no stress
applied to connected equipment thus delivering
long service life.

“No-load starting” condition on the starting
motor by decoupling the motor from the load
through the “working oil shut-off valve” feature.

Low maintenance expenses.

The Voith torque converter decouples the
starting motor from the gas turbine train during
gas turbine operation without the need for a
mechanical clutch through our exclusive “working
oil shut-off valve” feature.

Smooth and stepless output speed & torque
adjustment of the torque converter.
Because of the change in mass flow
(due to the adjustable guide vanes)
the turbine wheels’ speed is variable
and can be adjusted to match
the various operating points of the
gas turbine.
At low speed, the turbine develops
its highest torque. With increasing
turbine speed, output torque decreases.
Source:http://www.kanitengineering.com/pdf/VOITH_Torque-Converter.p...

Hope it helps.

Saludos a todos :)