10
Testing the battery
• Inspect the battery before the test.
• Battery terminals and connections will be corroded
in time. Corrosion will wear the terminals and prevent
charging. Disconnect the battery terminals and clean
the oxidation with hot water and then reconnect the
terminals and coat them with Vaseline.
• Don’t allow loose connection.
Hydrometer test
Battery charge situation and the specific gravity of the
sulfuric acid could be measured by hydrometer.
1. Don’t use distilled water only use pure water.
2. Insert the hydrometer into electrolyte, hydrometer
should stay vertically, Once the hydrometer comes to
a rest, observe the plane of the liquid surface. Your eye
must be horizontal to this plane
Evaluation is mentioned below;
1,270 .......1,280 fully charged
1,220 .......1.230 50% charged
1,150 .......1,220 discharged
4.3. Maintenance Free Batteries
Ensure that all battery connections are correct and
batteries are always charged. After that there is not
any procedure for this battery.
Control of the Battery;
Conduct an inspection every time before testing the
battery.
1. A white powdered element causes abrasion to the
pole-heads, its connections. Remove the connections
and wash them with hot water to purify the oxidation.
Reconnect it and coat with Vaseline.
2. Check if any un-tightened connections exist.
4.4. Starting Aids
It is customary to maintain coolant temperatures above
40°C min. To promote quick starting on an emergency
generator set and to take the load. Thermostatically
controlled external block heaters, deriving their supply
from the primary source of power are fitted in the
engine cooling system to provide this heating. Heater
warms up the jacket water of the engine when the
generator set is not working.
5. HEALTY and SAFETY
Safety should be the primary concern of the facility de
-
sign engineer and all personnel engaged on installation
and commissioning. Safety involves two aspects:
1) Safe operation of the generator itself (and its ac
-
cessories).
2) Reliable operation of the system.
Reliable operation of the system is related to safety
because equipment affecting life and health, such as
life support equipment in hospitals, emergency egress
lighting, building ventilators, elevators and fire pumps,
may depend on the generator set.
5.1. Fire Protection
Diesel Fuel can be stored on the floor in an appropri
-
ate tank .Although the flammability of the diesel is high
, it can still catch fire , so that fire extinguishers have to
be provided in the storage. Foam or CO2 have to be
used for diesel , oil , gas etc.
For electrical cables and bas bar contactors use CO2
or CTC.
Sand could be used for Isolations and small fires.
The design, selection and installation of fire protection
systems require the following considerations:
• The fire protection system must comply with the
requirements of National Standards.
• Typically, the generator room will be required to
have one hour fire resistance rating. Generator room
construction will have to have two hour fire resistance
rating.
• Generator room shall not be used for storage pur
-
poses.
• The authority may specify the quantity, type and siz
-
es of approved portable fire extinguishers required for
the generator room.
• A manual emergency stop station outside the gener
-
ator room or enclosure or remote from the generator
set in an outside enclosure would facilitate shutting
down the generator set in the event of a fire or anoth
-
er type of emergency.
• Generator sets have to be run at full load at least
once a year to prevent the accumulation of diesel in
exhaust system.
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