01__rotor_turning_gear_sss_rev13_en.pdf

Rotor turning gear – SSS

Rotor turning gear – SSS Function Rotate the turbine shaft Driven by an electrical motor Manual operation possible Avoiding extreme thermal stress Avoiding deformation of turbine shaft

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Application possibilities & Location System 1 with SSS clutch (synchronizing – self – shifting – clutch) ƒ Installed at the shaft end or gear box

System 2 with swivel pinion ƒ Installed via a swivel pinion, if there is no free shaft end available

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Main parts ƒ Motor c ƒ SSS – clutch d

f

ƒ Cover with safety switch e ƒ Crank (Hand wheel) f

c

e

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MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Motor Prerequisites for the start of the motor ƒ Lube oil supply available ƒ Jacking oil supply available (if applicable) ƒ Right speed range to protect SSS – clutch ƒ Release from other equipment (e.g. compressor)

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Motor Release for the normal stop ƒ Steam lines closed ƒ Vacuum has to be broken (only DK) ƒ Seal steam supply off (only DK) ƒ Steam turbine cooled down

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Motor Automatic control via PLC ƒ Start at 0.7 times nominal speed, or zero speed ƒ Stop at 0.8 times nominal speed ƒ Values are adjustable

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Motor Automatic stop of motor ƒ Protection of the machine ƒ Lube oil pressure ƒ Jacking oil pressure (if applicable) ƒ Failure of the motor (signal from MCC) ƒ Protection of the operator ƒ Turning gear cover open ƒ Emergency push button MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – SSS Disengaging if output fast then input ƒ Turbine shaft faster RTG shaft

Engaging at precisely the same speed ƒ Turbine shaft has the same speed as RTG shaft

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – SSS

Disengaged

Travelling

Engaged

Schematic

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Cover with safety switch Rotor turning gear cover is removed Switch generates a signal to the PLC Stopping the rotor turning gear No permission to start

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Crank (Hand wheel) Manually of the rotor turning gear turning ƒ Power failure of motor ƒ Turn the turbine shaft a half turn every 5 minutes or ƒ Every 15min a quarter turn ƒ Emergency oil supply

Use hand wheel at unknown rotor conditions

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Rotor turning gear diagram

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Rotor turning gear diagram Legend of the diagrams ƒ X1: Rotor temperature tR [°C] ƒ X2: Minimum period of rotor turning gear operation [h] ƒ Y:

Standstill period of turbine [min]

ƒ Sectors ƒ I:

Direct start-up possible

ƒ II: Switch on rotor turning gear before start-up ƒ III: Before switching on the rotor turning gear carefully crank the rotor using the hand wheel ƒ IV: Start-up not permitted; wait until machine unit has cooled down MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Rotor turning gear diagram Determination of the guide value for rotor temperature tR ƒ Compressors: tR = outlet temperature ƒ Steam turbine without control stage: tR = inlet temperature ƒ Steam turbine with single row control stage: tR = inlet temperature – 80 K ƒ Steam turbine with double row control stage: tR = inlet temperature – 140 K ƒ Expander: tR = inlet temperature – 25 K

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Rotor turning gear diagram Handling of the diagram to determine RTG operation ƒ Plot the rotor temperature as a vertical line in the left side of the diagram ƒ Plot the standstill period as an horizontal line over both parts of the diagram ƒ Determine the intersection to find out the correct sector ƒ In the right-hand part of the diagram, plot a vertical line from the intersection of the horizontal line and the rotor temperature

MAN Diesel & Turbo SE

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Rotor turning gear – SSS Operation – Rotor turning gear diagram Example with tR = 400 °C and a standstill period of 30 minutes Y

Y

X2

X1

MAN Diesel & Turbo SE

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Rotor turning gear – SSS HMI

MAN Diesel & Turbo SE

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Disclaimer All data provided in this document is non-binding. This data serves informational purposes only and is especially not guaranteed in any way. Depending on the subsequent specific individual projects, the relevant data may be subject to changes and will be assessed and determined individually for each project. This will depend on the particular characteristics of each individual project, especially specific site and operational conditions.

MAN Diesel & Turbo SE

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