Detailed Comparison
| Parameter | Wire Rope Hoist | Chain Hoist |
|---|---|---|
| Capacity range | 250 kg to 100+ t | 125 kg to ~20 t (typical <5 t for most applications) |
| Lifting speed | 3–30 m/min (often dual-speed) | 2–8 m/min (single speed typical) |
| Headroom required | Higher — drum requires space above hook | Lower — chain bag folds compactly |
| Duty classification | M3–M8 (continuous production use) | M1–M5 (light to moderate duty) |
| Lifespan | Longer with correct maintenance | Chain stretches over time — periodic replacement |
| Maintenance | Wire rope inspection, lubrication, drum/sheave wear | Chain elongation measurement, chain lubrication |
| Capital cost | Higher | Lower |
| Corrosive environments | Stainless options available (at high cost) | Stainless steel chain readily available; better chemical resistance |
| Explosion-proof (ATEX) | Available in Zone 1/2 | Available (air-operated chain hoists for Zone 1) |
Duty Classification (FEM/ISO 4301)
Hoist duty class must match the application — selecting too light a class is a common specification error that leads to premature mechanical failure:
| FEM class | ISO M class | Application |
|---|---|---|
| 1Am | M2 | Very light — rare use, e.g. maintenance hoists used weekly |
| 1Bm | M3 | Light — occasional production use, 2–3 lifts per day |
| 2m | M4 | Moderate — regular production, several lifts per hour |
| 3m | M5 | Heavy — continuous production, >10 lifts per hour |
| 4m | M6–M8 | Very heavy — intensive 24/7 production or steel mill duty |
Wire Rope Maintenance
Wire ropes must be inspected and lubricated per LEEA guidance and the manufacturer's schedule. Key inspection points:
- Broken wires: Discard if >10% of total wires in any rope lay are broken, or if any broken wire is at an end fitting
- Diameter reduction: Discard if diameter is reduced >10% from nominal (crushing or wear)
- Corrosion: Surface rust is acceptable with lubrication; internal corrosion or pitting requires replacement
- Kinks or bends: Discard immediately — kinks cause localised stress concentration and brittle failure
- Lubricate with wire rope lubricant (not grease) at required intervals — typically every 3 months in outdoor or harsh environments
Chain Hoist Maintenance
Load chains stretch over time. Measure chain elongation with the manufacturer's gauge or by counting links over a given length. Standard discard criterion: replace when elongation exceeds 2% of original length. Also inspect hook throat opening (replace if >5% over nominal), latch operation, and chain guide wear.
Under LOLER (UK) and PUWER regulations, all lifting equipment must be inspected by a competent person at intervals specified in the written scheme of examination — minimum every 6 months for equipment used to lift persons, every 12 months for other lifting equipment, or as specified by a competent person based on risk assessment.