Crusher Tons Per Hour: How to Read a Throughput Rating Before You Buy Direct answer: Tons per hour tph is a throughput rating measured under a defined set of
Direct answer: Tons per hour (tph) is a throughput rating measured under a defined set of conditions — feed material, closed-side setting, and screen configuration — not a fixed capability of the machine. If you compare offers by the headline tph alone, you risk oversizing or undersizing your plant. Before any equipment decision, you must state your feed conditions and desired product; only then does a tph figure become meaningful.
A crusher’s rated throughput is usually quoted for a reference material (for example, medium-hard limestone) with a given feed size and a specified discharge setting . Your material is unlikely to match that reference exactly, so actual output on your site will differ from the brochure value. Treat the published tph as a starting point for calculation rather than a contract guarantee.
Several variables change real output — my emphasis is on the ones buyers forget:
Your job as buyer is not to find the crusher with the largest number; it is to find the crusher whose throughput curve matches your material at your setting.
For a simple rough estimate of the hourly requirement, you need three inputs:
The working formula is: required average tph = annual target ÷ planned operating hours . If your annual target is 300,000 tonnes and you plan 2,000 hours, the average must be 150 tph. Do not buy machinery sized for 150 tph at the average — you must also cover the peak short-term flows, which leads to the table below.
This table is not a specification sheet. Use it to collect the information you must supply before a supplier can calculate a realistic tph for your application.
| Parameter | What it controls | What you must confirm |
|---|---|---|
| Material type and abrasiveness | Liner life, power draw, recommended crusher type | Unconfined compressive strength or work index from a lab test; site rock name is not enough |
| Maximum feed size | Crusher inlet dimensions and feeder opening | Largest stone dimension measured on site; do not use the rare outlier boulder — use the largest regular block |
| Feed bulk density | Belt speeds, hopper volume, stockpile volume | Measured loose density in t/m³ for your specific rock |
| Moisture and clay content | Screen efficiency, bridging risk, washing needs | Percentage of material passing 75 micron, and free moisture at seasonal worst |
| Required product spec | CSS, chamber choice, recirculation load | Required top size, fines content, and flakiness index for your customer |
| Demand profile | Surge capacity, stockpile conveyor sizing | Peak hourly demand versus average; a short high-demand stint changes conveyor and crusher sizing more than annual average |
| Planned operating hours | Capacity factor and engine duty | Shifts per day, seasonal weather stops, planned maintenance weeks |
Fill this in before requesting a quote. A supplier who quotes you a tph without asking for this table cannot give you a reliable number.
Every throughput rating carries a suitability boundary. A crusher rating assumes free-flowing, granular feed with a reasonable fines content and a manageable top size. The recommendation does not apply when:
In these cases, ask for test evidence from a pilot plant or a reference installation running the same material, not for a catalog number .
No responsible supplier can fix your operating tph from the machine nameplate alone. The missing inputs for a final selection are:
If you have an existing site, measure instead of estimate. If this is a greenfield project, present your assumed conditions openly and ask the supplier to state which assumptions their calculation relies on.
A final note on duty: sizing for the peak hour rather than the average is standard for the surge bin and the main conveyor, but a crusher selected for a peak that occurs rarely will run uneconomically for the rest of the year. Separate the peak-sizing decisions (feeders, conveyors) from the crusher sizing decision, which should track the sustained average plus a modest margin.
For a practical walkthrough of which machine family matches your material, start from the SUHMAN product catalog — but bring your material data to that conversation. To discuss your site layout and annual plan directly, go through the SUHMAN contact page and state your measured feed conditions in your first message. General notes on crushing and screening practice are collected on the SUHMAN blog, and a longer explanation of how SUHMAN positions itself as an equipment supplier is on the company page.
There is no universal percentage, because the derate depends on moisture, clay content, crushability, and the setting you run . A reasonable first step is to compare suppliers who can produce throughput data from a test with your material rather than a reference rock. If no such data exists, build your schedule with a conservative average capacity factor and plan a site trial with a rental or short-term unit before committing.
The rated tph is reached at different conditions for different machines — the feed size distribution, the CSS at which the rating applies, and the screen recirculation logic are not identical across models. A machine rated at the same tonnage but fed with a tighter CSS will run closer to its limit and leave less margin for surges. Compare the full operating curve and power draw, not the single headline figure.
Size the surge equipment — feeder, scalper, main conveyor — for the peak hour. Size the crusher itself for the sustained average plus a realistic operating margin; a crusher that only needs peak output during ten days of the year will burn excess fuel and wear liners at an uneconomical rate for the remaining weeks. State both the average and peak values when requesting a quote.
No. Each machine family rates throughput under its own reference conditions, and the numbers are not interchangeable. A jaw crusher rating applies to the primary reduction stage and is sensitive to feed entry constraints; a cone crusher rating assumes a certain feed grading going into the chamber and collapses if the feed contains excess fines; an impact crusher rating is strongly influenced by rotor velocity and the target reduction ratio . Match the machine family to the stage in your line — a primary jaw’s tph is not a substitute for a secondary cone’s tph in your line calculation.
The material backs up into the feeder and hopper, the crusher begins to choke, and power draw rises while throughput falls. The symptom is a slowing rather than a faster plant, often accompanied by frequent stops to clear the chamber. Continuous overfeeding also shortens liner life and increases the risk of mechanical overload on the drive train. Protect the circuit with a properly sized feeder and a scalping screen upstream, and do not treat the crusher as the safety valve for the rest of the plant.
