Setyr worked example — TRAM-1 — Haul Rope Inspection and Sheave Change Not approved for use. Version 1 · 2026-09-04
Worked example only — your site must author, review and approve its own
procedure under 29 CFR 1910.147(c)(4). setyr.com/procedures
TRAM-1 — Haul Rope Inspection and Sheave Change
Ropeway & tramway
Annual haul rope inspection with tower sheave assembly change. ANSI B77.1. Evacuation drive must remain available throughout.
This is a worked example, not a procedure you can adopt. It describes equipment that does not exist, with illustrative tag numbers.
29 CFR 1910.147(c)(4) requires the employer to develop, document and
utilise energy control procedures specific to their own machines, and (c)(6)
requires the employer to inspect those procedures periodically. Neither duty
can be delegated to a vendor or discharged by this document.
Isolation points
| # | Tag (illustrative) | Type | Disposition | What it does and why | Dwell |
|---|---|---|---|---|---|
| 10 | TRAM-CARRIER-PARK | Block | Apply & verify | Both carriers berthed in the terminals and secured. A carrier on span is a suspended load at height. | — |
| 20 | TRAM-MAIN-DISC | Disconnect | Isolate & lock | Main drive disconnect at the summit terminal MCC. 480V feed to the drive and station services. | — |
| 30 | TRAM-VFD-BUS | Bleed | Isolate & lock | Drive VFD DC bus discharge point. STORED ELECTRICAL - bus capacitors hold charge after the disconnect opens. | — |
| 40 | TRAM-SHEAVE-BRK | Valve | Isolate & lock | Drive sheave brake hydraulic release. Spring-applied, hydraulically released - isolating the release SETS the brake. | — |
| 50 | TRAM-SVC-BRK | Valve | Isolate & lock | Service brake release line. Second independent brake on the drive train. | — |
| 60 | TRAM-HYD-TENSION | Valve | Isolate & lock | Haul rope hydraulic tension supply to the counterweight carriage rams. | — |
| 70 | TRAM-HYD-ACC | Bleed | Isolate & lock | Tension system accumulator bleed. Holds rope tension after the pump stops - bleed and confirm the gauge. | — |
| 80 | TRAM-CWT-BLOCK | Block | Apply & verify | Counterweight carriage blocked and pinned on its rails. 40 tonnes of stored gravitational energy. | — |
| 90 | TRAM-EVAC-DRIVE | Disconnect | KEEP ENERGISED | Evacuation drive and APU. Must REMAIN AVAILABLE per ANSI B77.1 - the only means of rescuing stranded passengers. | — |
| 100 | TRAM-ANEMOMETER | Switch | KEEP ENERGISED | Wind monitoring and alarm. Must REMAIN LIVE while anyone is on the line or towers. | — |
| 110 | TRAM-CTRL-ESTOP | Switch | Not an isolation device | Line E-stop and control circuit. Control circuitry only - stops the drive but does NOT isolate energy. | — |
What your site must supply
- 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.
Authorship and validation
This example was authored by Setyr for domain validation. It is not derived from any customer's controlled documents. It illustrates the elements 29 CFR 1910.147(c)(4)(ii) requires a procedure to contain — it does not certify compliance, which is a property of an employer's programme rather than of any document.