Learn about the starting process and checks to be made while starting a ship's generator engine
Starting of generator engine
Starting
of an engine from "stop" state is something which needs to be done with
care, especially if the interval of starting is sufficiently long. The
following is a checklist of all the checks which ideally need to be
carried out before starting the generator. In actual practice sometimes
the engineers might take some of these for granted and skip, but it is
advisable not to indulge in such a practice. Infact these checks are
generic for any four stroke engine starting process
- Check the turbocharger sump oil level, governor, alternator, forward and aft lube oil levels, and diesel oil level in service tank
- Open the indicator cock
- Prime the lube oil to all parts by hand pump or by motor driven priming pump
- Ensure that all jacket cooler valves, lube oil cooler valves, air cooler valves should be in open position
- With
use of the Turning bar turn the fly wheel and check for any resistance
on the bottom end bearing and check any water / fuel coming out through
indicator cocks
- While turning engine, check all visible lube oil points are lubricated
- Remove the turning bar from fly wheel and put in the place
- Drain the auxiliary air bottle
- Blow
through engine (ie: by turning engine with air). In order to ensure
that no water is inside combustion chamber if it is present it may cause
water hammering
- Close the indicator cocks and pull lever from stop to start
- When the needle in RPM indicator deflects to some value of (0-25 rpm) put the lever in run condition
- The engine will run on fuel oil once the generator picks up the rated speed
- Put generator on load by closing air circuit breaker
- For
checking the alternator fore and aft bearing lube oil level by opening
oil plug in the alternator and the ring bearing while rotating splash
lube oil from the sump can be seen
- In order to synchronize the incoming generator with running generator syncroscope method/dark lamp method is used
Checks to be made while running
Once
the generator has actually started to run, there are several checks
which must be performed before it is left on its own to continue
running. These checks pertain to verifying various parameters related to
lube oil levels, temperatures and so forth. Given below is a brief
checklist related to the same.
Lube oil checks
- Sump lube oil level
- Governor lube oil level
- Rocker arm lube oil level
- Alternator forward and aft bearing lube oil level
- Lube oil in turbine & blower side of turbo charger
Temperature checks
- Exhaust gas temperature
- Turbocharger (inlet-outlet) temperature
- Booster air inlet temperature
Cooler temperatures
- Cooling sea water (inlet - out let) temperature in cooler
- Jacket cooling water (inlet - outlet) temperature
- Air cooler (inlet -outlet) temperature
Safety devices
Once
the above mentioned parameters have been checked and found within
normal range, it is safe to continue running the generator. Yet a fault
can develop even at a later stage, so for this very purpose various
trips and alarms are situated on the generators. An alarm gives the
signal of an impeding danger and requires quick action while a trip
actually trips the generator immediately because of the nature of the
fault.
The various trips and alarms are mentioned as follows
- Alternator bearing low oil level alarm & trip
- Alternator bearing high temperature lube oil alarm &trip
- Low sump oil level alarm and trip
- Lube low oil pressure alarm and trip
- Reverse current trip
- Over speed trip
- Over load trip
- High and low frequency trip
- Jacket cooling water low pressure alarm
By Kenneth Sleight