Bulk Terminal Operating Environment
Bulk material handling terminals β?port facilities loading and unloading coal, iron ore, fertilisers, grain, and other commodities β?operate in a demanding marine environment. The combination of salt air corrosion, 24/7 operation, high throughput demands, and strict environmental regulations makes belt selection and maintenance particularly important.
Terminal Conveyor Types and Their Belt Requirements
Ship Unloader Conveyors
Buckets or grabs discharge material onto conveyor belts inside the ship unloader structure. Drop heights are high (2β?m) and material flow is intermittent and uneven:
- Grade W for abrasive materials (iron ore, phosphate); Grade M for coal and grain
- 12β?6mm top cover for iron ore unloading
- Rubber impact bars at all loading points β?high impact energy from unloader discharge
Transfer Tower Conveyors
Multiple conveyors in transfer towers carrying material from ship unloaders to stockpiles. Relatively light duty but continuous operation:
- Cover grade matching material abrasiveness
- Standard EP carcass β?typically 200β?00m per conveyor flight
- Antistatic for coal conveyors throughout terminal
Stacker-Reclaimer Feed Conveyors
High throughput conveyors feeding stackers and bucket wheel reclaimers. Must handle peak flow rates and variable loading:
- Design for peak capacity β?minimum 120% of average throughput
- ST cord belts for longer stacker-reclaimer boom conveyors
- Self-aligning training idlers throughout β?outdoor conveyors are prone to wind-induced tracking problems
Ship Loader Boom Conveyors
Conveyors on ship loader booms must flex as the boom luffs and slews. This places additional demands on belt flexibility:
- EP carcass (not ST cord) β?flexibility required for boom movement
- Minimum pulley diameter must accommodate boom head pulley size
- Belt must withstand repeated flexing cycles as boom moves β?fatigue resistance important
Marine Environment Protection
| Component | Marine Protection Requirement |
|---|---|
| Belt cover compound | EPDM or UV-stabilised SBR for outdoor exposure |
| Belt fasteners | Stainless steel or hot-dip galvanised |
| Roller end caps | Marine-grade sealed bearings, IP67 minimum |
| Take-up counterweight | Hot-dip galvanised or stainless steel |
| Belt scrapers | Stainless steel holder, tungsten carbide blade |
β?Coal Terminal Antistatic Requirements
At coal export terminals, coal dust permeates the entire facility. ALL conveyors at a coal terminal β?including those that don't carry coal directly β?should be specified as antistatic (β?Γ10βΈβ?surface resistivity). Coal dust explosion risk exists throughout the terminal, not just at the loading points.
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