Highly Specialized Professionals
in Elevator Industry Standards

Dominion Elevator Inspection Services
Dominion Elevator Inspection Services
Dominion Elevator Inspection Services
Dominion Elevator Inspection Services

Elevator Safety Concerns:
Keeping You Up-To-Date

Hydraulic Elevators With "Single Bottom Cylinders"

Before 1972, hydraulic cylinders were typically manufactured with a single, flat bottom. This single bottom did not provide adequate safety in the event a breach occurred at the bottom.

The most recent code change occurred in 2002, and is directed specifically at elevators manufactured prior to 1972 with a "single bottom" cylinder. Owners with "single bottom" have two options: 1) Replace the cylinder with a double cylinder or a cylinder with a safety bulkhead protected from corrosion by an approval method; or 2) install an approved device on the existing system to protect against unintended car movement as a result of uncontrolled fluid loss.

Single and Double Bottom Cylinders



door restrictorPassenger/Service Elevators without
"Door Restrictive Device"

The ASME A17.1 Elevator Safety Code has required the installation of a Door Restrictor Device since 1980.

Passengers who become trapped in elevators may try to self evacuate by opening the car doors between landings, putting themselves at risk of serious injury or death. “Door Restrictors”, which prevent elevator car doors from being opened if the elevator is outside the unlocking zone, ensure that doors remain closed until appropriate action can be taken.

The installation of Door Restrictors improves passenger safety, meets national code requirements, and is a sound investment in your building's future.