LIFT-3 Detachable Chairlift — Terminal Grip Conveyor Isolation
Grip conveyor and tyre bank service in a detachable chairlift terminal. Covers the main drive, the auxiliary and evacuation drives that can turn the line independently, hydraulic tensioning, and rope movement driven by carriers on the line.
How Setyr addresses Ropeways & Tramways →
It refers to equipment that does not exist and illustrates the elements 29 CFR 1910.147(c)(4)(ii) requires a procedure to contain. It is not a document to adopt. Under (c)(4)(i) the employer must develop and document energy control procedures specific to their own machines, and under (c)(6) must inspect them at least annually.
12 points, in sequence
Main drive motor disconnect at the terminal switchboard.
Method: Open, lock, prove dead at the motor terminals.
Caution: A detachable lift has three ways to turn the line. This is only the first.
Auxiliary drive, used to creep the line for maintenance.
Method: Open and lock the auxiliary drive disconnect.
Caution: The auxiliary drive exists precisely to move the line during maintenance. It is the one that moves the rope while someone is in the terminal.
Evacuation drive, an independent diesel or hydraulic unit for line evacuation.
Method: Place the evacuation drive selector to OFF, lock, and remove the starting key.
Caution: The evacuation drive is independent of the electrical supply by design. Isolating the switchboard does nothing to it.
Service brake on the drive bullwheel, spring-applied and hydraulically released.
Method: Close and lock the brake hydraulic supply, then bleed the accumulator so the brake stays spring-applied.
Caution: These brakes release on pressure. A charged accumulator is a release path that survives electrical isolation.
Emergency brake on the bullwheel rim.
Method: Confirm the emergency brake is set and its accumulator bled. Must remain APPLIED.
Caution: Both brakes must be accounted for. Crews check the service brake and assume the emergency brake follows it.
Rope clamp applied at the terminal to prevent line movement.
Method: Apply the rope clamp and confirm it is torqued. Must be ENGAGED.
Caution: Carriers on a loaded line pull the rope through the terminal under gravity even with every drive isolated. The clamp is the restraint.
Hydraulic rope tensioning carriage at the return terminal.
Method: Close and lock the tensioning supply, then bleed the tension accumulator and confirm the carriage is on its stops.
Caution: Rope tension is stored energy across the whole line. Releasing it with the carriage off its stops moves the terminal structure.
Grip conveyor tyre bank drive within the terminal.
Method: Open and lock the conveyor drive disconnect.
Caution: The tyre bank is what the crew has their hands in. It runs off its own drive, not the main.
Terminal compressed air to the grip test rig and door actuators.
Method: Close and lock the supply and bleed the receiver.
Lift control system and the terminal PLC.
Method: Open and lock the control supply after confirming the brakes are mechanically set.
Caution: Dropping control power releases some interlocks. Set the brakes first, then isolate controls.
Terminal to terminal communications and the line stop circuit.
Method: Do NOT isolate. Confirm the line stop circuit and terminal communications are functional.
Caution: The two terminals are out of sight of each other. The stop circuit is how a crew at the drive stops something at the return.
Terminal heating and the grip heater bank.
Method: Do NOT isolate in freezing conditions.
Caution: Grips and hydraulics seize in a cold terminal, and the crew works there for hours.
What your site must supply
This example is structurally complete and factually generic. The things below are the things only you can know — and they are exactly what makes a procedure yours.
- Your own asset and isolation-point tag numbers. The tags shown are illustrative and refer to equipment that does not exist.
- The actual location of every disconnect, valve and vent on your equipment.
- Measured stored-energy magnitudes and the dwell time required to dissipate them.
- Your verification method for each point, and who is authorised to perform it.
- Any additional energy sources present on your equipment and absent here.
Author this properly, once
Setyr holds procedures like this as living documents — bound to real isolation points, with lock registries, group lockout, person-in-charge custody and periodic review built in.