Classroom on demand

Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.

Escalator Duty

Escalator Duty
Before we can establish an escalator duty, we need to first define what an escalator duty is. To do this, we need to know that an escalator duty is defined by three functions. These functions are application, location and persons per hour (the number of persons the escalator can transport each hour).
First, application anticipates the way escalator equipment will be used. The three categories of commercial, heavy duty and public transit are broad enough that there may be some overlapping applications. A commercial application would be department stores, malls and office buildings. Heavy duty applications would be convention centers, stadiums, airports and rises typically above 30’-0”. Transit applications are airports or subway systems or other very high-traffic applications with higher floor to floor rise.
Second, where will the escalator be located: indoors or outdoors? It is important to know if the escalator will be used outdoors so the correct material and design are selected to allow the escalator to operate and endure under extreme outdoor weather conditions.
Third, the number of persons that will be moved per hour must be estimated. Correctly estimating passenger traffic will prevent traffic crushes and unsafe operation.
The escalator duty equation is as follows:
Application + Location + Persons per Hour = Definition of Escalator Duty
Commercial or Heavy Duty or Transit + Indoor Outdoor + 4,500 or 6,750 or 9,000 = Escalator Duty Commercial
Commercial applications are typically installed in department stores, shopping malls and office buildings. Most of these applications are indoors but can be installed outdoors. The maximum rise of these applications is about 30 feet.
Commercial escalators are typically designed to move thousands of people and yet look elegant. The design will very often include glass balustrades, under handrail lighting and unique hand rail presentations.
Heavy Duty
Heavy traffic applications are typically found in convention centers, stadiums and airports where there is a very high traffic volume. These applications could be indoors or outdoors and designed for higher rise applications up to about 65 feet.
These heavy traffic applications have increased chain and motor sizing.
Transit applications are typically railway stations, airports and subway stations where there is a very high traffic volume. These applications could be indoors or outdoors and designed for higher rise applications up to about 164 feet. Transit projects are also characterized by complex specifications and high quality standards concerning passenger security, on-line availability and equipment maintainability.

These transit applications have a much larger, heavier truss structure, increased chain and motor sizing, heavier step track construction and a larger, heavier handrail drive system that combined make these units capable of maximum performance at full-load, around the clock capacity.

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