A slight amount of electrolyte may be lost each time a specific
gravity reading is taken, even though it is recommended that all
electrolyte in the hydrometer be returned to the cell after read-
ing. Therefore it is suggested that the pilot cell be changed to
another cell annually to provide a representative specific gravity
indicator for the battery.
SECTION 14
14.0 Records
A complete recorded history of the battery operation is
required. Good records will also show when corrective
action may be required to eliminate possible charging, main-
tenance or environmental problems.
Data should be recorded on Stationary Battery Maintenance
Report shown on page 15. Report headings should be filled
in completely on the date of installation.
The following data should be read and permanently record-
ed for review by supervisory personnel.
A. Upon completion of the initial charge and with the battery
floating at the desired float voltage for one week, read
and record individual cell voltages, connection resistanc-
es, specific gravities [corrected to 77°F (25°C)], ambient
temperature plus cell temperatures and electrolyte levels
for 10% of the cells. The cell temperature readings
should be from each step or tier of the rack to reflect
temperature range of the battery.
This first set of readings will be the basis for comparison
with subsequent readings to reflect possible operating
problems and the need for corrective action.
B.
Monthly
- Observe the general appearance and clean-
liness of the battery. Record battery terminal voltage.
Check electrolyte levels and adjust if necessary. Check
for cracks in cells and leakage. Note any evidence of
corrosion at terminals and connectors. Record pilot cell
voltage, specific gravity and temperature.
C.
Quarterly
- Supplement the monthly inspection and
record keeping with these additional measures. Check
and record the specific gravity and voltage of each cell.
Check and record the electrolyte temperature of one cell
on each level of individual racks.
D.
Annual
- Supplement quarterly reports with these extra
procedures. Make a detailed visual inspection of each
cell. Tighten all bolted connections to the specified
torque values. Take and record connection resistances
of each cell to cell, cell to terminal, inter-level and load
connections. Remake any connections that are more
than 20% above installation base value. Check integrity
of the rack.
E. Any time the battery is given an equalizing charge (see
Section 10.1), an additional set of individual cell readings
should be taken after battery has been returned to nor-
mal float for one week. These will serve as an updated
basis for comparison with future readings.
F. Record dates of any equalizing charges as well as total
quantity of water when added. Also record any mainte-
nance and/or testing performed.
The foregoing frequency of record taking may have to
be modified somewhat to suit local requirements.
See Page 16 for Battery nameplate
SECTION 15
15.0 Water Additions
There are two conditions in the operation of batteries which
cause a reduction in the amount of water in the electro-
lyte, resulting in a lowering of the electrolyte level. These
are normal evaporation and the conversion of water into
hydrogen and oxygen gases by the charging current. These
gases are liberated through the cell vents. Periodically, this
water loss must be replaced with approved or distilled water
to maintain the electrolyte level at the mid point between the
high and low level lines.
If suitability of the local water supply for use in storage bat-
teries is questionable, contact your nearest GNB represen-
tative for instructions regarding procedure for submitting a
sample for analysis. A report will be rendered as to whether
or not the water is suitable.
If water is to be stored in containers they should be clean
and of non-metallic material; such as: glass, hard rubber,
porcelain or plastic.
Infrequently used water lines should be purged to remove
accumulated impurities, thus preventing their introduction
into the battery.
Water additions should be scheduled prior to an equalizing
charge so that mixing with the electrolyte occurs. Also at
unheated installations, arrange water additions when bat-
tery temperature is above 50°F (10°C).
Never introduce “battery additives” into a GNB battery.
15.1 Water Purity
The maximum allowable limits of impurities in the water
used in GNB stationary batteries shall be as follows:
Total solids
500 ppm
Fixed solids
350ppm
Organic & volatile matter
200ppm
Iron as Fe
4.0 ppm
Manganese as Mn
0.007 ppm
Nitrates as N02
15.0 ppm
Ammonia as NH4
5.0 ppm
Chlorides as CL
25.0 ppm
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