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
possibilities exist, the building framing shall be arranged to
permit future installation of such additional elevator
equipment as will be required to handle future possible
increase in traffic volume.
E.
Special conditions which must receive consideration in
estimating elevator requirements include cafeteria traffic,
canteen store traffic, transient traffic, visitor traffic,
building management, grouping of elevators, external transport
facilities, building entrances at more than one level,
basement facilities, unusual interfloor traffic requirements,
and trash removal.
F.
Where groups of elevators serving identical floors are
required to be furnished in two or more locations for the
purpose of providing reasonable convenience of use, the
elevators shall provide a minimum carrying capacity of not
less than 120 percent of the maximum traffic peak. This
factor provides the elimination of unequal distribution of
traffic.
G.
Elevators shall have the capability to handle their maximum
peak loads while providing a satisfactory interval. Consider
the following:
1.
Where one elevator would normally meet the requirements in
the facility where elevator service is essential (such as
facilities over 2 stories high), two elevators shall be
installed to insure continuity of service. If there are
financial restrictions during construction, install one
elevator now and provide a future elevator hoistway.
5.
GUIDELINES:
5.1
The equipment specified shall depend upon the service demand and
the equipment commercially available to meet those demands. Care
shall be exercised to avoid specifying non-competitive methods in
features of elevator.
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