How to Size a Farm Feed Production Line to Capacity and Scale
Leave a message
Why Line Capacity Has to Match Daily Feed Demand
The throughput of a feed production line decides how much of the capital budget actually works every day. A farm that installs a 5 t/h line for a 500-head pig herd runs the pellet mill only a few hours a week, leaves the batching bins half loaded and ties up workshop space that could have earned its keep elsewhere. The opposite mistake costs just as much: a 10,000-head pig farm served by a 1 t/h line has to buy compound feed from outside during peak demand and pays a supplier margin on every ton it cannot press itself. The workable rule is to size the line on the average daily requirement of the herd or flock, add a 15-20 percent buffer for seasonal peaks, and then check the result against the hours a realistic crew can actually work.
Capacity Tiers for Small, Medium and Large Farms
Daily demand converts into three equipment tiers that are widely used at the planning stage. The figures below are supply-side references built from typical equipment quotations and standard workshop construction costs; they should always be compared with local prices before a budget is approved.
| Farm scale | Daily demand | Line capacity | Core equipment | Workshop | Guide investment |
|---|---|---|---|---|---|
| Small | 1-3 t/day | 1-2 t/h | Crusher, horizontal mixer, ring die pellet mill, belt conveyor | From 50 m2, ceiling 3 m or more | RMB 200,000-400,000 |
| Medium | 5-10 t/day | 3-5 t/h | Automatic batching for 8-12 raw materials, cooler, screener, semi-automatic bagging machine | 300-500 m2, ceiling 4.5 m or more | RMB 500,000-800,000 |
| Large | Over 15 t/day | 8-15 t/h | Intelligent batching, unattended pelleting, automatic warehousing, manufacturing execution system | 800-1,200 m2, zoned layout | RMB 1.5-3 million |
Two capacity rules sit behind the table. First, the rated capacity of a pellet mill is measured on a defined die and a reference formula, so a mill rated at 5 t/h may deliver 3.5 t/h on a high-fat or high-fibre recipe; motor power and die specification have to be read together rather than as separate numbers. Second, the batching section, not the press, usually sets the real output of the line, because a batch scale that needs four minutes per batch limits the whole plant no matter how fast the mill runs.
Site, Layout and Building Requirements
A small line does not need a purpose-built factory. An existing idle workshop of at least 50 m2 with a clear ceiling height of 3 m or more is enough, and a linear layout keeps manual feeding and bagging easy. Medium and large lines are better housed in a dedicated building with clear zoning between the raw material area, the processing area and the finished product area. Place the raw material zone next to the storage warehouse and the bagging zone next to the loading passage, so that forklift traffic never crosses the process flow.
Leave room for aspiration and dust collection from the start. Grinding and pelleting both generate dust, and a bag filter or cyclone added afterwards usually means cutting into the building envelope. A ceiling height of at least 4.5 m is recommended for medium and large lines because bucket elevators and gravity spouts need vertical space; low headroom forces horizontal conveying, which adds wear and energy loss. Machine guarding should follow the general design principles of ISO 12100, and the electrical installation should be sized for the connected load of the whole line rather than for the largest single motor.
Staffing and Automation Level
Personnel allocation follows the automation level more than the tonnage. A compact line with manual feeding and manual bagging typically needs 3-5 operators per shift, which suits small farms with a fixed labour pool. A medium or large line with automatic batching, a central control cabinet and closed-loop pelleting needs only 2-3 people to monitor the process, check the dies and handle the finished bags. The saving is real but has to be earned: automation replaces part of the labour cost only when the line runs enough hours per day to keep the control system busy, so a plant that presses for two hours a day will not recover the extra instrumentation investment.
Budget Planning and the Mistakes That Repeat
Two errors appear again and again in farm feed projects. The first is buying a line larger than needed because the price per ton of nominal capacity looks attractive; idle time, a higher connected load and a bigger building quickly erase that advantage. The second is buying a line that is too small, then paying for outside feed and overtime shifts for years. The practical sequence is to fix the daily demand, choose modular equipment that can be expanded by adding a second pellet mill or a larger batch scale, and budget the building, the labour, the spare dies and the maintenance spares together with the machines rather than separately.
Frequently Asked Questions
Q: How do I calculate the daily feed demand of my farm?
Multiply the number of animals by the average daily intake per head and add a 15-20 percent buffer for seasonal variation and handling losses.
Q: Can a 1 t/h line be upgraded later?
Yes, if the workshop, the batching scale and the conveying equipment are specified one size larger from the beginning; adding a second press afterwards is far cheaper than rebuilding the building.
Q: Is a larger pellet mill always more efficient?
Not necessarily. Specific energy consumption per ton falls as capacity rises, but only while the mill runs near its rated load; a big mill on very short runs consumes more total energy than a correctly sized one.
Q: Which die specification suits poultry feed?
A ring die with 3-4 mm holes and a matched compression ratio suits most poultry mash-to-pellet recipes; the exact ratio should be aligned with the fat and moisture level of the formula.
Q: How much spare capacity should the batching system have?
Roughly 20 percent above the demand of the pellet mill, so that a full batch is always ready while the press runs and the crew never waits on the scale.
Q: Do small lines need a dust collection system?
Yes. Grinding and mixing release fine dust, and a cyclone or bag filter sized for the airflow of the hammer mill protects both the operators and the electrical equipment.
