exceed 60 m (200 feet). Any decentralized banks and/or
clustering of elevators should be planned to include at least
two cars to maintain an acceptable dispatch interval between
cars and insure continuity of service.
E.
The lobby width between two banks of passenger elevators shall
be not less than 3.6 m (12 feet). Service elevators lobby
shall be no less than 4.2 m (14 feet).
4.
SIZE AND NUMBER OF ELEVATORS:
4.1
Size and number of elevators required for a given building depends
upon the size and function of the building, allocation of
activities in it, density of population, the physical location and
grouping of elevators, etc. The elevator installation needed for
a given facility shall be estimated on the basis of anticipated
local condition, quality of service, and the overall annual cost
of the installation. The overall annual cost of the transport
systems, including amortized costs of the original investment,
cost of maintenance, material, and consumed power shall be
considered.
4.2
The following primary functions shall be used for the purpose of
estimating the elevator requirements:
A.
The anticipated population density figures shall be provided
by the Department of Veterans Affairs to assist in the system
design. However, in all cases, the vertical transportation
requirements shall be planned for the total population that
the facility could reasonably house, rather than a forecast of
initial occupancy.
B.
Maximum traffic peak. This is the maximum percentage of the
total population on the floors served by the elevators that
must be handled during any 5 minute period. This maximum
traffic peak will vary with the type of functional areas and
special conditions applicable to the facility. In general, the
maximum traffic peak shall be considered as being up peak by
the 24 hourly summaries, i.e., based on elevator loading at
the lower main terminal, or terminals, local discharge of
passengers on the up trip and express runback to the lowest
main terminal.
C.
The computations for vertical transportation equipment shall
be based on transporting 10 to 14 percent of those persons who
move between floors during periods of maximum demand in five
minutes. The peak values, together with the population
density factor should provide a reserve capacity adequate to
maintain reasonable satisfactory service during periods when
one elevator is shut down for repairs.
D.
The possibility of changes in the type of occupancy and
reassignment of building areas that would result in a greater
volume of traffic shall be investigated. When such
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