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.

Jack Protection

The A17.1 Safety Code for Elevators and Escalators requires that a cylinder installed below ground be protected from corrosion. As a minimum, one of three methods may be used: 1) monitored cathodic protection; 2) a coating to protect the cylinder that will withstand the installation process; 3) a protective casing. Also required is a method to determine ongoing compliance.

ThyssenKrupp uses the “protective casing method” as experience shows that this method seems to provide the customer the best long term protection with minimum customer intervention.

A HDPE (High Density Polyethelyn) pipe is factory provided for all ThyssenKrupp single piece jacks. The HDPE is factory assembled with the jack to help provide an efficient installation. A HDPE or PVC casing is used for multiple jack sections and field installed.

In some cases a steel casing must be first installed to prevent the jack hole from back filling. When required, the steel casing is sized larger then the HDPE or PVC pipe casing so the steel casing is large enough to accommodate these protective pipe casings. The HDPE or PVC casings are sized larger then the largest part of the jack cylinder which would be the joint coupling for multiple section jacks The jack is placed in the HDPE/PVC casing and the HDPE/ PVC casing caped at the bottom and sealed with hydraulic cement at the pit floor.

Tags:  hydraulic HDPE PVC jack


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