MIL-HDBK-1191
particular calculation procedure that should be utilized in ascertaining the
desired result (i.e., an acceptable response time). Base elevator
calculations on the areas served. The designer may utilize any suitable
calculation procedure provided that all assumptions and logic
flow/calculations in the analysis are clearly stated. In addition, the
designer will consider loading/unloading time, door operation time, elevator
velocities/accelerations and any other parameters that influence the round
trip time utilized in the analysis (state all assumptions built into this
value.) Alternate systems proposed will be evaluated utilizing a life-cycle-
cost analysis.
17.6.2
Passenger Handling Capacity. Where the exact peak traffic
conditions cannot be obtained or calculated for a given facility, Figure 17.3
may be used.
17.6.3
Patient Service Handling Capacity. The 5 minute peak handling
capacity for patient service cars, not including materials or logistics
traffic, shall be calculated as follows:
a. Total Moves / Day x 18.2% = Peak Hour Moves
b. Peak Hour Moves /12 = Average 5 Minutes
c. Average 5 Minutes x 1.25 = Peak 5 Minute Handling Capacity.
The Elevator Traffic Study and Analysis must detail these moves.
Select passenger elevator systems to provide a 35 second response waiting time
interval based on 5 minutes of two way peak period traffic for the facility,
assuming a maximum car capacity of 60 percent, that considers the worst case
traffic loading scenario, computed using the most accurate of
historical/actual traffic data or the projected traffic data/consideration set
forth below:
a.
Ten percent of the anticipated visitor and staff traffic.
b.
Two percent of the anticipated ambulant inpatient traffic.
c. Two percent of the anticipated non-ambulant inpatient traffic.
d. Admissions/discharges based on 20 percent of the inpatient traffic
(or a reasonable assumption).
e.
Miscellaneous traffic loading not covered by the above factors
(state assumptions).
17.6.4
Other Service Traffic (Materials, Housekeeping, Construction and
Maintenance Traffic). Peaks for these traffic types shall be calculated in
15- minute intervals, with an allowance of a 5-minute peak representing 40% of
the peak 15 minute total. Base studies on the actual total number of
materials handling, logistics and housekeeping moves estimated by the
materials handling analysis and the materials management report, plus 40%
allowance for unscheduled moves and for future schedule flexibility, plus 4%
allowance for construction and maintenance traffic.
Hospital service elevator systems will be selected to provide a 45 second
response waiting time interval based on the most intense hourly traffic demand
anticipated.
17-7
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