Granite quarries in northern Vietnam often run well in dry months, then see product drift when rainy-season feed brings extra fines and sticky contamination.
This guide compares three 180-320 TPH layouts that prioritize dispatch consistency and spec compliance over headline capacity.
30-second decision framework
Condition
Project mix is heavy on expressway base and concrete aggregate
Use staged reduction with dedicated shaping duty
Holding shape and gradation together is easier when reduction and shaping roles are separated.
Condition
Rainy season causes frequent screen overload and recirculation spikes
Choose route with stronger screening margin and conservative setpoints
Pushing aggressive settings in wet feed conditions usually creates unstable throughput.
Condition
Dispatch windows are strict and rejection penalties are real
Adopt contract-grade route with tighter control loop
Uptime and repeatable quality generally outperform occasional peak output days.
Inputs you must lock before model selection
- Customer demand split between base, 10 mm, and 20 mm products.
- Rainy-season contamination profile by quarry face.
- Historical recirculation load at peak wet weeks.
- Spec rejection history by product size class.
- Available maintenance hours during high-demand season.
Recommended process lines
Starter quarry route
Capacity: 180-230 TPH
Feed: Granite feed up to 700 mm
Target output: General aggregate mix
Setup: PE Jaw -> PY Cone -> screen
Why this works
- Fast to commission for expanding quarries.
- Lower control complexity for startup teams.
- Solid baseline when spec pressure is moderate.
Balanced rainy-season route
Capacity: 220-290 TPH
Feed: Mixed granite with seasonal fines
Target output: Stable 5-10-20 mm products
Setup: PE Jaw -> PY Cone -> PF Impact shaping -> screen
Why this works
- Better shape and gradation control in wet weeks.
- More stable under variable feed contamination.
- Good fit for multi-project dispatch demand.
Contract-grade route
Capacity: 280-320 TPH
Feed: Large granite projects with strict QA auditing
Target output: Tight gradation and low rejection
Setup: PE Jaw -> dual PY Cone -> PF Impact trim -> multi-deck screen
Why this works
- Highest control over final product consistency.
- Supports projects with quality-linked penalties.
- Keeps headroom for volume growth without redesign.
Vietnam granite route comparison
| Metric | Starter | Balanced | Contract-grade |
|---|---|---|---|
| Best use case | Early-stage quarry production | Mixed-project stable operation | Strict quality-contract supply |
| Gradation control | Basic | Good | Excellent |
| Rainy-season robustness | Medium | High | High |
| Main risk | Spec drift in wet season | Tuning discipline required | Higher fixed-cost burden |
| Scale-up readiness | Medium | Good | Best |
Rainy-Season Playbook Beats Emergency Adjustments
Plants that lock wet-season parameter windows before peak rain usually keep product quality stable. Plants that tune ad hoc often spend weeks in reactive mode.
A simple two-mode operating pack, with clear trigger criteria and shift handover checks, reduces most avoidable instability.
- Prepare dry and wet operation packs before rainy months.
- Track contamination source by bench and shift.
- Review shape index and gradation as one KPI set.
- Escalate rising rejection trend as process alarm.
How to Keep Supplier Quotes Comparable
Ask all bidders to quote against one identical rainy-season scenario. Without shared assumptions, paper comparisons are misleading.
Require a settings playbook for dry and wet modes in the technical deliverables.
RFQ checklist before you contact suppliers
- Seasonal feed contamination assumptions and data source.
- Product spec targets by size class and customer.
- Dry/wet operation setpoint strategy.
- Expected recirculation range under wet feed.
- Spare and liner plan for peak season.
- Acceptance test including rainy-season scenario.
Need a model recommendation for your project?
Share your feed size, target products, and throughput range. Our engineering team can propose a practical equipment list and sizing baseline.
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