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Pipe and profile mill plants are continuous production lines where a steel strip is turned into a pipe or profile by cold forming (roll forming). The visible star of these lines is the roll-forming stand that bends the strip step by step; however, the uninterrupted operation of the line depends on the fan and pump motors in the background. If the cooling pump, hydraulic unit, weld-zone extraction or smoke fan stops, the line stops. In this article we cover the fan-pump motors of a pipe and profile mill plant along the axes of cooling, hydraulics and line aspiration, with the right power, speed and speed control. As HEM Motor, an electric motor factory manufacturing since 1979, we supply cast iron body IE3/IE4 motors for mill lines from Türkiye stock with fast delivery.
The Cold Forming Line and Its Motor Requirements
On a cold forming line, the steel strip is taken from the decoiler; it is straightened, bent by passing through the roll-forming stations, joined by welding and cut to length. The main drive of the line is usually provided by a central motor or station-based motors; however, the focus of this article is the motors of the auxiliary systems that support the line. These are the cooling water pump, the hydraulic unit pump, the welding fume extraction fan and the line blowing/cleaning fans. Each runs in continuous (S1) duty for long hours.
On continuous lines the efficiency of the motor is directly reflected in the energy bill; that is why the IE3 and IE4 efficiency classes are preferred. We covered similar applications requiring high torque and low vibration in continuous line drives in our rolling mill and foundry electric motors article. You can find similar motor groups such as the press pump, the draw bench and the furnace fan in aluminium profile production in our aluminium extrusion plant electric motors article.
Cooling Pump Motors
Cold forming, and especially the welding zone, is cooled continuously with water or emulsion. If the pump motor that circulates this cooling fluid stops, the weld quality deteriorates and the line has to stop. For this reason the cooling pump motor must be in continuous S1 duty, reliable and with suitable IP protection. Our centrifugal pump motor selection article guides selecting a centrifugal pump motor by flow and head.
Calculating the pump motor power correctly is important to make neither an undersized nor an oversized selection; our motor power calculation: pump, fan and conveyor article is a practical resource. Since the fan motors on the cooling tower and chiller side work in the open air, their IP protection is more critical; we covered this subject in our cooling tower and chiller fan motors article. Our IE4 threshold in pumps, fans and compressors article clarifies in which case the IE4 threshold comes into play in pump applications.
Hydraulic Unit Motors
On a pipe-profile line, cutting, pressing, clamping and station adjustments are mostly done with hydraulics. The motor that drives the pump of the hydraulic unit draws continuous power at constant pressure and must be resistant to heating. In these motors a cast iron body, class F insulation and a quality bearing are the standard choice. To correctly determine the duty type of the hydraulic motor, you can look at our electric motor duty type selection article.
The mounting type of the hydraulic unit motor can be B5 flange, B3 foot or B35 according to the structure of the unit. The correct selection of the mounting type is important in terms of sealing and vibration. You can also see the similar hydraulic drive logic in the press and CNC lines of the automotive supplier industry in our automotive supplier electric motors article. You can review our entire efficient motor range on our efficient electric motors page.
Line Aspiration and Smoke Fan Motors
On pipe and profile lines, the welding process produces smoke and fine particles. The extraction and smoke fan motors that remove this smoke from the environment are critical both for worker health and for process quality. The extraction fan runs continuously and usually turns at high speed. We covered dust collection and extraction fan motor selection in our extraction and dust collection fan motor selection article.
We compared power and speed selection by centrifugal and axial fan type in our centrifugal and axial fan motor selection article. We explained the motors requiring continuous operation and sealing for vacuum and industrial blower applications in our vacuum pump and industrial blower motors article. You can find the details of the project-based supply of smoke exhaust fan motors in our smoke exhaust fan motor supply guide article.
Continuous Line and Speed Control (VFD)
The pipe-profile line is a typical application requiring speed control. The line speed changes according to the product diameter and material thickness; for this reason the main drive and some auxiliary motors are controlled with a frequency inverter (VFD). A VFD provides both precise speed control and energy savings. We covered when a VFD is needed and how it is selected in our frequency inverter (VFD) with asynchronous motor article.
In high-power pump and fan motors, a soft starter or star-delta is used to limit the initial starting current. We compared the starting methods in our star-delta or soft starter article. Our high-efficiency motor + frequency inverter article explains with numerical logic the savings that a high-efficiency motor and a frequency inverter provide together in pumps and fans.
Pole, Speed and Power Selection
In fan and pump motors, the choice of pole count (speed) is made according to the application. In high-pressure pumps and compact fans 2 poles (3000 rpm); in general pumps, fans and hydraulic units 4 poles (1500 rpm); in large-diameter, quiet fans 6 poles (1000 rpm) are preferred. We explained pole selection in asynchronous motors and which is suitable for which job in our asynchronous motor pole selection: 2, 4, 6 poles article.
In power selection, it is correct to run the motor not continuously at full load but with a power margin. We covered correct sizing in our motor load ratio and correct sizing article. You can find power and speed selection in continuously loaded drives such as compressed air and screw compressors in our compressed air and screw compressor motors article.
Cast Iron Body and Continuous Operation
Mill lines mostly run two or three shifts, without interruption. This continuity requires the thermal and mechanical endurance of the motor. The cast iron body provides high mechanical strength, better vibration damping and long life. In the HEM range, the cast iron body is offered in a wide power band from 0.55 kW to 355 kW, in IE3 and IE4 efficiency classes, with 100% copper windings. We clarified the difference between cast iron and aluminium body in our cast iron or aluminium body article.
In continuously running plants, motor fleet management and the replacement schedule are also important; we covered this subject in our motor fleet management in three-shift facilities article. Keeping a spare motor in stock in advance for critical machines guarantees uninterrupted operation of the line; we gathered which powers should be kept as spares in our critical spare motor list article. You can review the entire cast iron range on our efficient electric motors page.
Supply, Lead Time and Equivalent Replacement
On a pipe-profile line, the failure of a pump or fan motor means the whole line stops. That is why the supply side is critically important. Meeting the most sought-after power-speed combinations from manufacturer stock with fast delivery minimizes unplanned downtime. Even if the brand of your existing motor is different, it is possible to prepare an exactly equivalent motor from the nameplate information; you can look at our old brand motor direct replacement article for equivalent selection.
Our information to provide when requesting a quote article summarizes the details you need to send for a correct and fast quote. You can find the checks to be done at delivery in our shipping damage check list article and the first start in our motor commissioning checklist article. You can also review the similar continuous drive motors on a cable and wire drawing line in our cable and wire drawing factory electric motors article.
Pipe-Profile Mill Motor Selection Checklist
- Duty type: Continuous S1 duty for pump, fan and hydraulics.
- Efficiency: IE3/IE4 efficiency class as it is a continuous line.
- Poles/Speed: 2 poles at high pressure, 4 poles in general use, 6 poles in quiet fans.
- Protection class: Suitable IP protection in wet/smoky zones (IP55 and above).
- Frame: Cast iron - endurance to continuous operation and vibration.
- Speed control: VFD for line speed and fan flow.
- Starting: Soft starter / star-delta at high power.
- Supply: Manufacturer stock, fast delivery and equivalent replacement.
Frequently Asked Questions
Which efficiency class should be selected for the cooling pump motor?
The cooling pump on a pipe-profile line usually runs in continuous (S1) duty for long hours. Since the annual running hours are high, the efficiency class is directly reflected in the energy bill; for this reason IE3, and if possible IE4, efficiency class should be preferred. The most correct approach is to evaluate in which case the IE4 threshold comes into play in the pump motor, and to make the investment according to the continuous running hours.
Is a VFD essential for adjusting the line speed?
If the line speed needs to be changed according to the product diameter and material thickness, a VFD is essential in practice; it provides both precise speed control and energy savings. On auxiliary pumps running at a fixed speed and not requiring speed control, a VFD is not mandatory; in this case a soft starter or star-delta starting may be sufficient. The decision is made according to the application's speed-control need and energy-saving target.
How do I replace my existing pump/fan motor on a one-to-one basis?
It is sufficient to provide the nameplate information of the existing motor completely: power (kW), speed (rpm), frame size, mounting type (B3/B5/B35), shaft diameter and IP/insulation class. With this information we prepare an exactly equivalent motor from stock even if the brand is different. We explained step by step how to do the correct matching from the nameplate in our avoid the wrong motor delivery article.
Get a Quote
Would you like to plan the cooling pump, hydraulic unit and extraction fan motors of your pipe and profile mill plant from a single supplier, with the right efficiency class and IP protection? Send us the nameplate information of your existing motors or the power-speed values recommended by your machine manufacturer; let us present cast iron body IE3/IE4 motors, together with a VFD recommendation if needed, in a single quote. As HEM Motor, we supply motors between 0.55 and 355 kW from Türkiye stock with fast shipping. Reach us right away at +90 (532) 345 49 86 or fill out the form on our contact us page; let our technical team plan the most suitable motor selection for your mill line together with you.
