Elevator Design Considerations

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Clinic passenger/service elevator systems, either attached to a hospital or
freestanding, will be selected to provide transportation to floors above grade
at a 40 second response waiting time interval based on a 5 minute peak period
for the facility that considers the worst case traffic loading scenario,
computed using the most accurate of historical/actual traffic data or the
projected traffic data/considerations set forth below:
a. Ten percent of the anticipated visitor and staff traffic.
b. Miscellaneous traffic and material handling traffic data (state
c. For broad planning purposes, including (a) and (b) above a factor of
16.6 percent may be utilized.
Average Maximum Ride Time (AMRT).
Figure 17.4 lists the allowable
Average Maximum Ride Time.
Codes.  Elevators shall be designed in accordance with all
applicable Federal, State and local codes, including NFPA, "National
Electrical Code", ASME A17.1, A17.2, A17.3 and A17.5 (reference 17a, 17b, 17c,
and 17d).  This includes designing to the appropriate rating/load
classification for the intended application.  Elevators shall be designed to
meet all UFAS and ADAAG provisions applicable to the project.
Elevator Types.  Elevator types and speeds shall comply with
Figure 17.5.  Higher speeds may be used if needed to satisfy traffic demands.
Elevator selections will not exceed the elevator rise criteria given in
Figure 17.5.
Electric traction elevators may be used for passenger service and hospital
service applications.
Hydraulic powered elevators may be considered for use where vertical travel is
less than 13.7 m (45 feet), or when overhead clearance is limited.  Speed for
hydraulic elevators will be minimal in the up direction with full rated loads.
Valves that are contained in the pump unit assembly will control hydraulic
acceleration, deceleration and leveling.
Hydraulic elevators rated for 80 starts per hour shall be utilized for light
duty/light usage applications. Hydraulic elevators rated for 120 starts per
hour shall be utilized for heavy duty/heavy usage applications.
Elevator Location and Travel Distances.
Passenger and Combined Use Elevators.  Elevators will be located
in direct relationship to major building entrances and convenient to major
traffic generating functions such as lobbies. Passenger and combined use
elevators shall be planned to provide a maximum walking distance of 61 m (200
ft). A distance of 46 m (150 ft) is preferred.
Service Elevators.  Service elevators shall be planned to  provide
a maximum walking distance of 61 m (200 ft) for users on patient  floors.  A
distance of 52 m (170 ft) is preferred.


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