Single Production Line vs Modular Expansion
A plant that needs 20 t/h can install one 20 t/h line or two 10 t/h lines. The tonnage is the same; the cost per tonne, the downtime exposure and the ability to run several products in parallel are not.
Single larger line
- Lower CAPEX per tonne of installed capacity
- Fewer machines to staff, maintain and stock spares for
- Simpler automation, layout and civil works
- Better specific energy at full load on large equipment
- Single point of failure — one breakdown halts all production
- Product changeovers cost real production time
- Poor part-load efficiency if demand grows slower than planned
- Medicated or species-segregated production is harder to manage
- — Single-species, single-product-family plants
- — Stable, well-understood demand at or near design tonnage
- — Projects where CAPEX is the binding constraint
- — Markets tolerant of occasional production interruptions
Modular multi-line expansion
- A failure on one line does not stop the plant
- Parallel products without changeover or cross-contamination risk
- CAPEX can be phased against actual demand growth
- Maintenance can be done on one line while producing on the other
- Higher total CAPEX for the same nameplate tonnage
- More equipment, more spares, more maintenance labour
- More complex layout, automation and control philosophy
- Duplicated fixed costs at low utilisation
- — Multi-species plants with medicated or segregated formulas
- — Integrators where a feed stoppage halts animal production
- — Demand expected to grow over several years
- — Aquafeed and premix operations with frequent recipe changes
| Criterion | Single larger line | Modular multi-line expansion |
|---|---|---|
| Capital cost | Lower per tonne installed | Typically 20–40% higher for equivalent total capacity |
| Operating cost | Lower fixed cost, higher cost of unplanned downtime | Higher fixed cost, much lower cost of a single failure |
| Energy | Efficient at full load, poor when running part-load | Efficient across a wider demand range by running fewer lines |
| Maintenance | Must be scheduled into production stoppages | Can be performed line by line without stopping the plant |
Price the downtime before choosing. For an integrator whose farms stop when the mill stops, the redundancy of a second line is usually worth its extra capital; for a merchant mill with buffer stock and a single product family, one larger line is generally the better return. The middle path most projects should at least evaluate is a single line now with civil works, utilities and space provisioned for a second — that keeps first-phase CAPEX close to the single-line case while making the expansion an equipment purchase rather than a rebuild.
Frequently asked questions
Is two smaller lines always more expensive than one large line?
How should expansion space be reserved in a first-phase plant?
Does a second line help with medicated feed?
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