Cooling water is the quiet energy user in a rolling mill. Descaling pumps, roll cooling, run-out cooling and tower fans run almost every hour the mill is on, and most of them were sized and set for the hardest product the mill will ever roll. On an ordinary shift that means pumps running more capacity than the product needs, pressure set higher than the grade requires and flow continuing through every gap in the schedule. Software that watches flow demand against what the pumps deliver can show exactly where that margin is wasted. Mill teams that want to see their own demand profile can review a cooling demand profile drawn from their own mill data in a short session.
Run Only the Pumps the Product Actually Needs
iFactory AI compares cooling flow demand with pump capacity every minute, then recommends staging and setpoints that cut mill cooling energy without risking rolling quality.
Where Mill Cooling Energy Goes
Before tuning anything, it helps to know which loads matter. The bars show an illustrative split of cooling-related electricity for a hot rolling mill.
Demand Against Supply, Hour by Hour
Cooling demand follows the rolling schedule, but pump output often does not. The columns compare an illustrative demand with fixed pump output across eight periods.
Find Out How Much Pumping Your Mill Does for Nothing
Send us a week of flow, pressure and schedule data. iFactory AI will show demand against supply for every pump group, and where the margin sits.
Pump Staging: Stay Near the Best Efficiency Point
A pump is most efficient near a particular flow. Running too many pumps at low flow, or one pump far from its best point, wastes power. The columns show an illustrative efficiency curve.
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| Flow Demand | Pumps Running | Why |
|---|---|---|
| Below 30% | One, with a drive if fitted | Avoids a second pump idling near zero flow |
| 30 to 60% | One or two, by efficiency | Keeps each pump near its best point |
| 60 to 90% | Two or three | Matches the peak without recirculating flow |
| Above 90% | All, with standby ready | Protects quality at peak demand |
Setpoints Set for the Hardest Product
Most mills use one pressure setpoint for every product, usually the one the heaviest section needs. The bars show an illustrative required pressure against the fixed setting.
A Composite Scenario: Savings Differ by Product
A bar mill applied product-based setpoints and demand-based staging. The bars show an illustrative cooling energy index for each product group after the changes, with 100 as the starting point.
Where iFactory AI Fits
Flow meters, pump drives and rolling schedules sit in different systems. iFactory AI joins them and shows cooling energy per tonne by product.
Flow Demand Analysis
Demand is derived from schedule, product and speed, then compared with pump output.
Staging Recommendations
Suggested pump combinations keep each pump near its best efficiency point.
Recipe-Based Setpoints
Pressure and flow targets are set by product, within quality limits.
Verified Savings
Cooling kWh per tonne is tracked before and after, normalised for product mix.
Expert Review: What Holds Up and What to Check
Cooling optimisation is simple to describe and easy to get wrong in practice. This review sets out how experienced mill engineers judge a proposal before trusting it.
Frequently Asked Questions
Can cooling energy really fall by 12 to 25 percent?
It can in mills with large margins, but there is no guaranteed figure. The saving depends on how far pump capacity and pressure exceed real demand, and on the product mix. Measure demand against supply first and then size the opportunity. Our team can size the range from a sample of your flow data before you commit.
Will lower flow hurt product quality?
It must not, and quality limits are the first constraint in any recommendation. Minimum flows and pressures per product are agreed with process and quality engineers, and the software works only within them. Changes are staged and monitored against surface and temperature results, so any quality effect shows up early and the change can be reversed.
Do we need new variable speed drives?
Not to start. Staging and setpoint changes often deliver savings with the equipment you already have. Drives are worth considering where flow varies widely and valves currently throttle it. The data shows which pumps would benefit. Watch a drive suitability screen run on a sample pump group.
How do we handle pump start limits and wear?
Staging rules include minimum run and rest times, so pumps are not cycled too often. Starts are counted, and wear is balanced across the pumps in a group. These limits come from the pump and motor suppliers. Good staging usually reduces wear overall, because pumps stop running far from their best efficiency point.
How does this connect to kWh per tonne reporting?
Cooling energy is attributed to the mill and the product, so it appears directly in kWh per tonne and in cost per tonne. Before-and-after comparisons are normalised for product mix. Ask how results roll into your energy scorecard and which fields are stored for audit.
Stop Paying to Pump Water Your Product Never Uses
See flow demand, pump staging and setpoints on your own mill, with the saving and the quality limits side by side. Book a working session with a mill energy specialist.
