Emergency generator on ship provides power in case the main generators of the ship fails and creates a “dead or blackout condition”. According to general requirement, at least two modes of starting an emergency generator should be available. The two modes should be – battery start and hydraulic or pneumatic start.
The Port state control (PSC) might detain a ship or provide some time to correct any kind of deficiency found if the second mode of starting is not operating.
Testing of Emergency Generator
The testing of ship’s emergency generator is done every week (as part of weekly checks) by running it unloaded to check if it starts on battery mode. The hydraulic start is done every month to ensure that it is working fine. Also every month automatic start of generator is also done to check its automatic operation and to see whether it comes on load.
Procedure for Battery Start
- Go to the emergency generator room and find the panel for emergency generator.
- Put the switch on the test mode from automatic mode. The generator will start automatically but will not come on load.
- Check voltage and frequency in the meter.
- Keep the generator running for 10-15 min and check the exhaust temp and other parameters.
- Check the sump level.
- For stopping the generator, put the switch in manual and then stop the generator.
Procedure for Hydraulic Start
- Out the switch in manual mode as stated above and check the pressure gauge for sufficient oil pressure.
- Open the valve from accumulator to generator.
- Push the spring loaded valve and the generator should start.
- Check voltage and frequency.
- Keep the generator running for 10-15 min and check the exhaust temp and other parameters.
- Check the sump level
- For stopping, use the manual stop button from the panel.
- After stopping the generator, pressurize the hydraulic accumulator to desired pressure.
- Close the valve from accumulator to generator.
Procedure for Automatic Start
- For automatic start, we know that there is a breaker which connects Emergency Switch Board (ESB) and Main Switch Board (MSB); and there is also an interlock provided due to which the emergency generator and Main power of the ship cannot be supplied together.
- Therefore, we simulate by opening the breaker from the tie line, which can be done from the MSB or the ESB panel.
- After opening the breaker, the emergency generator starts automatically with the help of batteries and will supply essential power to machinery and pumps connected to ESB.
- For stopping the generator, the breaker is closed again and due to the interlock the generator becomes off load.
- Now again put the switch to manual mode to stop the generator.
- Press stop and the generator will stop.
Can anyone shed light on how the blackout situation is rectified. I am interested in how the battery is able to crank the emergency generator to get it running when this is the system used
Thanks
pls tell me what are the safeties in emergency switchboard
, the breaker is closed again and due to the interlock the generator becomes off load.
Dear karthik,
The emergency switchboard safeties are the same as main switchboard. In emergency generator there is lube oil low pressure alarm, fuel leak alarm and belt cut alarms only. That is in most japan built ships. I hope it answers yous question
HI,
Could you tell me as to what are the most common specifications for an emergency generator (diesel powered) and alternator’s specifications too.????
Thanks.
Very valuable information…thanx fr such a great help..
can any one explain me how is the interlocked connected between msb and esb? how the emergency gen starts automatically when main gen fails??
Can anyone tell that generator is running & acb is closed frequency is also same but generator isnot coming onload what can be the causes
Please tell the safeties for emergency generator and emergency switchboard
Are there any specific SOLAS or IMO requirement regarding the duration of the monthly test of an emergency generator on a MODU? I have seen some recommendations but nothing official.
Some say it should be ran for 1 hour and some say only 30 minutes.
What is harbour mode and procedures for running emergency generator in harbour mode (Hyundai switchboard)?
@Koshal: The emergency generators switchboard is provided with this mode so that it can be used during laytime in port for the supply of the ship mains.
How it starts automatically ? What mechanism is used to sense that the voltage has dropped so the em. Gen should start?
What is the frequency for load testing of emergency generator??