Setyr worked example — CR-101 Primary Crusher — Mantle Change Isolation Not approved for use. Version 1 · 2026-11-05
Worked example only — your site must author, review and approve its own
procedure under 29 CFR 1910.147(c)(4). setyr.com/procedures
CR-101 Primary Crusher — Mantle Change Isolation
Mining & aggregates
Full isolation of CR-101 for mantle change. Includes upstream CV-200 feed conveyor isolation per interlock requirement.
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 | CV-200-HV-ISO | Disconnect | Isolate & lock | CV-200 feed conveyor drive isolator. Interlocked upstream source - isolate for any CR-101 chamber work. | — |
| 20 | CR-101-CHUTE | Block | Isolate & lock | Feed chute gate. Blocks material ingress. STORED GRAVITATIONAL - chamber must be confirmed empty. | — |
| 30 | CR-101-HV-ISO | Disconnect | Isolate & lock | 6.6kV main motor isolator. HIGH VOLTAGE - earthing required. Flywheel coasts up to 8 minutes. | — |
| 40 | CR-101-EARTH | Chain | Isolate & lock | Portable earth application point at the 6.6kV motor terminals. Applied after proving dead. | — |
| 50 | CR-101-LUBE | Disconnect | Isolate & lock | Lube system pump isolator. Isolate after the main drive has fully stopped. | — |
| 60 | CR-101-HYD-SUP | Valve | Isolate & lock | Hydraulic supply isolation valve to the mantle adjustment cylinders. | — |
| 70 | CR-101-HYD-ACC | Bleed | Isolate & lock | Hydraulic accumulator bleed valve. STORED PRESSURE - bleed to zero and verify on the gauge. | — |
| 80 | CV-201-EARTH | Chain | Apply & verify | Portable earth application point at the 11kV drive. Applied AFTER isolation and proving dead. Removed last. | — |
| 90 | CV-201-HOLDBACK | Block | Apply & verify | Backstop holdback engagement. Prevents loaded belt runback on the incline. Must be ENGAGED. | — |
| 100 | CR-101-HOIST-ISO | Disconnect | KEEP ENERGISED | Local disconnect feeding the 5-tonne maintenance hoist over the crusher deck. The hoist lifts the mantle and concave liners clear of the shell, so it is required for this work and is deliberately left energised. Caution: Isolating the whole crusher MCC takes the maintenance hoist with it. Verify the hoist feed is on a separate supply before locking the MCC. Do NOT isolate. Confirm the disconnect is closed and the hoist pendant is live before the crew commits to the lift. | — |
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.