UFC 3 -520-01
June 10, 2002
ventilation system. The ventilation system must limit hydrogen accumulation to less
than 2 perce nt of the total volume of the battery area and the location should be free of
areas that might collect pockets of hydrogen. Maximum hydrogen evolution rate is 1.27
x 10-7 cubic meters per second (0.000269 cubic feet per minute ) per charging ampere
per cell at 25 C (77 F) at standard pressure. The worst -case condition occurs when
forcing maximum current into a fully charged battery, such as the end of an equalizing
charge, and applies to both vented and VRLA batteries.
14-1.3.2.3 Verify that the new battery arrangement will not cause disruptions in airflow
that could result in unacceptable cell temperature variations.
14-1.3.2.4 Verify the charger is compatible with the new battery. Consider the following
design features: recharge rate, output ripple, and equalizing voltage.
14-1.3.2.5 Confirm that electrical protective device ratings and setpoints are appropriate
for the battery size and type.
14-1.3.3 Installation Requirements.
14-1.3.3.1 Ensure the maintenance and test requirements of the battery are well
understood. Include the cost of maintenance into the battery selection process. The
type of battery selected (vented lead-acid, VRLA, or nickel-cadmium) will directly impact
maintenance requirements.
14-1.3.3.2 Confirm the footprint of the b attery allows for adequate room to perform
maintenance and testing.
14-1.3.3.3 Confirm the rack height is appropriate for the room dimensions to allow
access to the tops of the cells without undue hazard.
14-1.3.3.4 Verify the rack height, room arrangeme nt, and footprint allow for proper
arrangement of rigging equipment.
14-1.3.3.5 Determine if on site spare cells will be needed. If spare cells will be
maintained on site permanently, establish where the cells will be stored and how they
will be charged.
14-1.3.3.6 Verify existing test equipment is adequate.
14-1.3.3.7 Determine if the installation location allows for convenient connection to load
test equipment. A case in point is a battery that was installed in a building basement
and the available load bank was too large for the stairs.
14-1.3.3.8 All related local maintenance inspection and test procedures might require
revision if the battery type is changed.
14-7
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