20 TPH feed mill: what the capacity really means before you request quotes

Nominal capacity versus real average output

A rated capacity is valid only against the conditions it was measured under. Change any one of these and the real rate moves:

Plan the plant on effective tonnes per operating hour, not the nameplate rate, and record that assumption in the RFQ so suppliers answer against your basis.

• Recipe: high-fibre, high-fat or high-inclusion-by-product formulas pellet slower than a standard maize-soya broiler ration
• Pellet diameter: small diameter (2–3 mm) pellets reduce throughput sharply against 4–6 mm
• Conditioning: steam quality, retention time and target conditioning temperature all shift the achievable rate
• Grinding fineness: a finer grind ahead of the press moves the bottleneck upstream to the hammer mill
• Cooling and drying: the cooler, not the press, sets the sustainable rate in hot and humid climates
• Changeovers, flushing, batching gaps, cleaning and planned maintenance

Annual tonnage at 20 TPH

Annual output depends on shifts and uptime far more than on the rated figure. Use the same basis for every proposal:

• One shift, moderate uptime: around 50,000 tonnes per year
• Extended shifts and higher uptime: up to about 120,000 tonnes per year
• State planned operating hours per day, days per week and weeks per year in the RFQ
• Reserve headroom for growth, seasonal peaks and future product ranges before fixing the capacity

Process line scope at this size

At 20 TPH the line is usually engineered around parallel capacity in critical stages: multiple hammer mills or a larger grinding line, a high-capacity mixer with short cycle times, one or two pellet presses, a large counterflow cooler and dedicated post-pelleting handling. Redundancy decisions — a second press versus a single larger one — should be made before quotation, because they change the entire proposal.

Raw material and finished feed storage

Ingredient intake rate becomes a design constraint of its own: the plant must be able to receive raw materials faster than it consumes them. Specify truck and, where relevant, rail or vessel intake rates, plus days of cover for each major ingredient.

Utilities and connected load

Connected load, boiler sizing and specific energy consumption per tonne all become material cost drivers. Require suppliers to state expected kWh per tonne for grinding and pelleting at your reference recipe, since it directly affects operating cost over the plant life.

Staffing and operating model

Typically a full shift organisation with separate production, quality, maintenance and logistics functions, plus a formal preventive maintenance programme and a defined critical spares list.

Budget framing

Interface risk between process, civil, structural and electrical packages becomes a real cost at this scale. Decide the delivery model — manufacturer-led, EPC-led or multi-supplier with your own coordination — before requesting quotations.

What your RFQ must state for this capacity

• Reference recipe (or recipes) the capacity is measured against
• Pellet diameters and the share of production per diameter
• Mash, pellet, crumble and any post-pelleting treatment volumes
• Operating hours per day, days per week, weeks per year
• Guaranteed capacity at the reference condition, and expected derate on the hardest recipe
• Grinding, mixing, pelleting, cooling and load-out capacities as separate figures
• Ingredient intake rate and finished-feed dispatch rate
• Automation level, weighing accuracy and batching cycle time
• Connected load, installed power and expected specific energy consumption
• Exclusions: civil works, steel, electrical supply, installation, commissioning, spares