LNG Steam Simulator Exercise


013. Run the Simulator to Run-up the Turbo Alternator

[Load Snapshot "Ex_013_Changing Over from DO to HFO_Burning"]

- Asssume scenario as described below [but check to confirm] and then follow the given procedures


Electrical Power:-

Shore Power:Off; Emergency Generator:Auto Stand-by; Both Turbo Generators:Off; Diesel Generator:On

Deaerator:-

Full with guage glass reading between 60~70 mm

Both Boilers:-

Both Boiler Press - aboout 6 Mpa; Both boilers are running on HFO supply.

Distilled Water Tank (DWT) & Atmospheric Drain Tank (ADT):-

Both DWT & ADT about 60% full.

>> Procedure to prepare and run up a Turbo Alternator:-

Main Condenser:
1 Ensure that a vacuum is present in the main Condenser and not in Alarm. Ensure a Main Circ Pump is running to produce SW flow through the condenser.
Main Distrib:
2 Close T/G 1 Pre-Lube pump circuit breaker.
3 Close T/G 2 Pre-Lube pump circuit breaker.
Stbd. Boiler:
4 Open Stbd Boiler T/A Stop valve.
Port Boiler:
5 Open Port Boiler T/A Stop valve.
Turbo Alts:
6 Start up the T/A Pre-Lubepump on the T/A you wish to run up by switching to Auto.
7 Note: A T/A cannot be run up without Pre-Lube(unlike the D/A which can).
T/A 1 Preparation:
8 Open T/A 1 LO Cooling inlet and outlet valves (Fresh Water side).
9 Open T/A 1 Winding cooler inlet and outlet valves (Fresh Water side).
10 Open Steam to Condenser Valve.
11 Open Gland seal Reg Valve.
12 Select 'M' for Manual operation (of the steam supply valve).
13 Ensure that the Steam Supply valve position is 0%.
14 Open both Bulkhead Stop Valves.
15 Open T/A 1 Steam main line supply valve (to the steam control valve which is at 0%).
16 The steam Supply Pressure just before the steam control valve rises and the low steam pressure alarm is cleared at 750 psi.
17 If the T/A has not been used for some time it is good practice to go through a 'Warming up' procedure.
Warimng Up:
18 Open the casing drain valve.
19 Gently open the steam supply valve to about 5% and run the T/A up to about 1000 RPM to warm through.
20 Close the steam supply and casing drain valve.
21 If the steam supply valve is opened too much the T/A may run up to an overspeed condition and trip (Trip light illuminates red).
22 If this happens then shut the steam supply valve and let the T/A coast down.
23 At low T/A speeds click the reset button and the trip light will extinguish.
24 Restart the T/A pre-lub pump.
25 Close the casing drain valve.
26 Click'A' for Auto and note that the manual control (slider) disappears.
27 The T/A is now under governor control which opens the steam supply valve up to 100%.
28. The T/A runs up and the steam supply valve automatically reduces and settles at a running value. The T/A runs up and the steam supplyvalve automatically reduces and settles at a running value. The T/A speed adjustment now comes from the raise / lower switches on the T/A S/B.

NOTE:

1) Check Knowledgebase - .........