Lift Design for Commercial Buildings

The computer program Llama allows a designer to obtain a quick but accurate indication of the possible lift configurations that may be suitable for use in commercial buildings. LLAMA can be used with all types of low and high rise buildings that use single deck lifts of all shapes, sizes and speeds. LLAMA is very user friendly and a lift designer with little or no computer or keyboard skills can quickly enter or change data ready for calculations, reruns or multiple runs.
LLAMA considers two basic criteria of a lift service; the “Passenger Handling Capacity” and the “Waiting Peak”. By stipulating the range of these two parameters, the program can calculate the possible lift solutions to fulfill them. The calculations are based on the methods formalised by G. R. Strakosh in “vertical Transportation, Elevators and Escalators”, second edition. Lift data is based on actual times of well adjusted lift equipment and not on statements of performance stated in tender documents or sales information.



  • The program uses an internationally accepted calculation method.
  • The entry, calculation and printout of more than one run at a time is catered for to enable easy comparisons. This is useful when considering different load factors or building populations on the same project.
  • The program provides time allowances, if required, for buildings using flexi time and for buildings having basement access.
  • All data is checked at the time of entry to make sure it is reasonable and within practical ranges and Help is provided on all input items.

The data is entered on two screens


The Building Details Screen


The Lift Details Screen

The program can be used in two modes. First to provide a number of solutions to a design problem based on a range of Waiting Intervals and Handling Capacities. Second it can be used to calculate the Waiting Interval and the Handling Capacity of a specific lift configuration.


The full results including all runs in the current project, can be downloaded to a report and then viewed and printed.

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