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, dietary distribution and retrieval,
transient traffic, visitor traffic, outpatient traffic,
pharmacy, building management, SPD, surgery warehousing,
spinal cord injury, grouping of elevators, external transport
facilities, building entrances at more than one level,
basement facilities, unusual interfloor traffic requirements,
and trash removal if chutes are not used.
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.
Passenger and service elevators shall have the capability to
handle their maximum peak loads while providing a satisfactory
interval. Consider the following:
1.
A capacity and speed shall be selected that will require
the least number of elevators to handle the peak loads
with an acceptable interval. Where four or more passenger
elevators are in a group, the interval shall be no greater
that 45 seconds. Service elevators in a group shall have
an interval of 60 seconds maximum. Where there are fewer
than four elevators in a group, the interval shall be no
greater than 45 seconds maximum. For passenger elevators,
except special outpatient elevators or other special
purpose elevators, the most suitable car capacities are
1815 kg (4000 lbs). When separate service elevators are
provided, they shall be 2270 kg (5000 lb). capacity.
2.
Where one elevator would normally meet the requirements in
the facility where patient 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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