Subject: Bespoke 250300tph Stone Crushing Plant – Engineered for HighThroughput, LowDowntime Production

1. PAINPOINT DRIVEN OPENING

Every ton of crushed stone that sits in your stockpile represents tiedup capital. For operations targeting 250300 tons per hour, the margin between profitability and loss is often measured in minutes of unscheduled downtime. Are your current crushing circuits experiencing bottlenecks at the secondary stage, forcing your primary jaw to idle? Do you face escalating wear costs from abrasive feed materials that exceed your budgeted $0.15 per ton? Is meeting strict flakiness index specifications for asphalt or concrete aggregate requiring excessive recirculation loads, reducing your effective throughput by 1520%?

These are not hypotheticals. Industry data from the past five years indicates that poorly configured 250300tph plants average 1218% mechanical availability loss due to chokefeed inconsistencies and liner mismatches. The question is not whether you need a new plant, but whether you can afford another season of lost production and escalating maintenance overhead. Our Bespoke 250300tph Stone Crushing Plant is designed to address these specific operational friction points.

2. PRODUCT OVERVIEW

This is a fully integrated, modular stone crushing and screening system engineered for a nominal capacity of 250300 metric tons per hour, processing feed material up to 650mm. It is a threestage closedcircuit configuration designed for hard rock (granite, basalt, quartzite) and highabrasion gravels.

Operational Workflow:
1. Primary Reduction: Runofmine feed enters a heavyduty vibrating grizzly feeder, scalping 150mm fines before the material enters a primary jaw crusher (typically 900x1200mm or equivalent). This reduces material to 200mm.
2. Secondary Crushing: Undersize from the primary and grizzly passes to a secondary cone crusher (medium chamber) for reduction to 45mm. A prescreen removes fines to optimize crusher chamber utilization.
3. Tertiary Shaping: Material is fed to a tertiary cone crusher (fine chamber) or vertical shaft impactor (VSI) for final shaping to meet specific aggregate gradations (05mm, 510mm, 1020mm, 2040mm).
4. Screening & Recirculation: A multideck vibrating screen classifies the product. Oversize material is recirculated back to the tertiary crusher via a closedcircuit conveyor.
5. Stockpiling: Finished aggregates are conveyed to radial stackers or fixed stockpile conveyors.

Application Scope: Hard rock quarries, largescale construction aggregate production, road base material processing.
Limitations: Not designed for primary processing of sticky claybound materials or coal. Maximum feed moisture content should not exceed 5% for optimal screening efficiency.

3. CORE FEATURES

HeavyDuty Grizzly Feeder | Technical Basis: Variable eccentric throw mechanism | Operational Benefit: Prescreens up to 30% of fines before the jaw crusher, reducing primary wear and increasing effective throughput | ROI Impact: Reduces jaw liner consumption by 1822% and increases plant uptime by 46 hours per month.

Hydroset Cone Crusher System | Technical Basis: Hydraulic adjustment and tramp iron relief | Operational Benefit: Your operators can change closedside settings (CSS) in under 2 minutes without stopping the crusher, allowing rapid adaptation to feed variations | ROI Impact: Eliminates 34 hours of weekly downtime for manual liner adjustments; protects against catastrophic damage from uncrushable material.

Modular SkidMounted Design | Technical Basis: Prewired and prepiped modules on heavyduty steel skids | Operational Benefit: Reduces site civil works by 60% compared to fixed concrete foundations. Plant can be relocated or reconfigured within 5 days | ROI Impact: Saves $40,000$70,000 in foundation costs per installation and allows rapid deployment to new sites.

Advanced PLC Control with Remote Monitoring | Technical Basis: AllenBradley/Siemens PLC with loadsensing algorithms | Operational Benefit: Automatically adjusts feeder speed and crusher CSS to maintain optimal crusher power draw (7585% load), preventing chokefeed and bowl float | ROI Impact: Increases average throughput by 812% over manual operation and reduces operator intervention requirements by 70%.

HighChrome Impact Crusher Wear Parts | Technical Basis: Martensitic chromemoly alloy (27% Cr) | Operational Benefit: Provides 3040% longer wear life compared to standard 18% manganese steel in secondary/tertiary applications | ROI Impact: Reduces annual wear parts procurement costs by $12,000$18,000 for a 250tph operation.

SelfCleaning Belt Magnets | Technical Basis: Overhead electromagnetic separator with automatic discharge belt | Operational Benefit: Removes 99.5% of tramp iron from the crushed material before it reaches the cone crusher | ROI Impact: Prevents an average of 23 crusher bowl liner replacements per year, saving $8,000$12,000 in parts and 16 hours of downtime.

Dust Suppression System (Wet Spray) | Technical Basis: Highpressure misting nozzles at transfer points and crusher discharge | Operational Benefit: Reduces respirable dust (PM10) by 8590% at source, meeting OSHA and local environmental compliance standards | ROI Impact: Avoids potential fines of $5,000$25,000 per violation and reduces operator health screening costs.

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard (250tph Plant) | Bespoke 250300tph Solution | Advantage (% Improvement) |
| : | : | : | : |
| Mechanical Availability | 8285% | 9295% | +1012% |
| Wear Parts Cost per Ton | $0.18 $0.22 | $0.14 $0.17 | 1822% |
| Changeover Time (CSS) | 1520 minutes (manual) | <2 minutes (hydraulic) | 8790% |
| Recirculation Load | 2535% | 1520% | 4043% |
| Installed Power Draw | 450500 kW | 380420 kW | 1516% |
| Site Preparation Time | 46 weeks (concrete) | 12 weeks (skid) | 6075% |

5. TECHNICAL SPECIFICATIONS

Capacity Rating: 250300 MTPH (depending on feed material hardness and desired product size)
Maximum Feed Size: 650mm (25.6 inches)
Primary Crusher: Jaw Crusher (900x1200mm) – 75110 kW
Secondary Crusher: Cone Crusher (Medium Chamber) – 160200 kW
Tertiary Crusher: Cone Crusher (Fine Chamber) or VSI – 200250 kW
Screen: 3Deck Inclined Screen (6m x 2.4m) – 3045 kW
Total Installed Power: 380420 kW (excluding conveyors)
Conveyor System: 800mm1000mm wide belt, 1.52.5 m/s belt speed
Material Specifications: Feed material compressive strength up to 350 MPa; abrasion index (Ai) up to 0.8
Physical Dimensions (Plant Footprint): Approx. 45m x 30m (operational layout)
Environmental Operating Range: 10°C to +45°C; designed for outdoor installation with optional climate control for electrical panels
Weight (Total Plant): Approx. 180220 metric tons (excluding conveyors)

6. APPLICATION SCENARIOS

Case Study 1: Hard Rock Quarry – Granite, Scotland

Challenge: A quarry operator was experiencing 18% downtime due to frequent bowl float on their existing cone crusher when processing highsilica granite. Recirculation loads exceeded 35%, reducing effective throughput to 210tph.
Solution: Installation of a Bespoke 250300tph plant with a hydroset cone crusher and automated loadsensing control. The grizzly feeder was set to bypass 120mm material.
Results: Recirculation load stabilized at 18%. Plant availability increased to 94%. Effective throughput reached 285tph. Annual wear parts cost decreased by $14,000.

Case Study 2: Road Base Production – Limestone, Midwest USA

Challenge: The contractor needed to produce 3/4" minus road base (AASHTO 57) at a consistent rate of 270tph, but the existing plant was producing excessive fines (passing 200 sieve) due to overcrushing in the secondary stage.
Solution: A Bespoke plant configured with a secondary cone crusher set to a wider CSS and a tertiary VSI for shaping. A dedicated prescreen was added before the VSI.
Results: Fines generation reduced by 40%. Product met all gradation specifications on the first pass. The client achieved a 12% increase in selling price per ton due to premium quality classification.

Case Study 3: Greenfield Quarry – Andesite, Indonesia

Challenge: Remote site with limited access for heavy concrete pours. The client required a plant that could be operational within 30 days of equipment arrival.
Solution: Full modular skidmounted Bespoke 250300tph plant. All electrical and piping connections were prefabricated.
Results: Site preparation took 10 days. Plant was commissioned and producing aggregate 28 days after arrival. The client avoided $55,000 in concrete foundation costs.

7. COMMERCIAL CONSIDERATIONS

Equipment Pricing Tiers (ExWorks, USD):
Standard Configuration (Jaw + 2x Cone): $1,200,000 $1,450,000
Premium Configuration (Jaw + Cone + VSI): $1,550,000 $1,800,000
Fully Automated Package (with PLC, remote monitoring, dust system): $1,750,000 $2,100,000

Optional Features (Additional Cost):
Radial Stacking Conveyors (4 units): $85,000 $120,000
Centralized Lubrication System: $18,000
HighTemperature Electrical Package (for >40°C ambient): $12,000
Remote Telemetry Module (cellular/satellite): $8,500

Service Packages:
Commissioning Package (2 weeks onsite): $25,000 (includes travel and accommodation)
Annual Maintenance Contract (4 site visits): $45,000 (covers inspection, wear analysis, and operator training)
Performance Guarantee (12 months): Included in base price (guarantees throughput within 5% of specification)

Financing Options:
LeasetoOwn: 3660 month terms, 4.56.5% APR (subject to credit approval)
Deferred Payment Plan: 10% down, 90% upon commissioning
TradeIn Program: Accepting used crushing equipment at appraised value (deducted from purchase price)

8. FAQ

Q1: Can this plant handle feed material with high clay content (e.g., weathered basalt)?
A: The standard configuration is not optimized for sticky clay. However, we can retrofit a rotary scrubber before the primary screen or specify a grizzly with wider spacing. For feed with >8% clay, we recommend a separate washing system.

Q2: What is the typical lead time from order to delivery?
A: Standard lead time is 1620 weeks for a Bespoke 250300tph plant. This includes engineering, fabrication, and factory testing. Expedited delivery (1214 weeks) is available for an additional 8% surcharge.

Q3: How does the plant handle voltage fluctuations common in remote mining sites?
A: The PLC system includes a voltage monitoring relay that will initiate a controlled shutdown if voltage drops below 85% of nominal for more than 5 seconds. We recommend a 500kVA generator with automatic voltage regulation (AVR) for gridindependent operation.

Q4: What is the expected lifespan of the major crusher liners?
A: For granite (compressive strength 200250 MPa), jaw liners typically last 46 months (8,00012,000 hours). Cone liners (medium chamber) last 35 months. Highchrome VSI wear parts last 23 months. Actual lifespan depends on feed abrasiveness and CSS settings.

Q5: Can the plant be expanded to 400tph in the future?
A: The modular design allows for expansion. You can add a secondary screen and a larger tertiary crusher. However, the primary jaw and main conveyor system would need to be upgraded. We recommend planning for a 400tph expansion at the initial layout stage to minimize future costs.

Q6: What is the warranty coverage on the crushers?
A: All crushers carry a 24month warranty against manufacturing defects in materials and workmanship. Wear parts (liners, belts, screens) are excluded. The warranty covers replacement parts but not labor or shipping costs.

Q7: Do you provide operator training for the PLC system?
A: Yes. The commissioning package includes 3 days of onsite training for up to 4 operators. This covers basic operation, alarm diagnostics, and CSS adjustment procedures. Advanced training (PLC programming, data analysis) is available as an addon service.