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Pump up the volume

Lincoln P212 multi-line pump from SKF
Lincoln P212 multi-line pump from SKF

2015 July 01, 09:00 GMT

SKF’s Lincoln P212 multi-line pump keeps the lube flowing in the most demanding environments – from mining to tunnelling.
A new high performance pump from SKF promises to deliver larger volumes of lubricant under the toughest conditions.
The Lincoln P212 multi-outlet pump is designed for use in multi-line lubrication systems or as a centralised pump in large progressive systems. It was developed with demanding environments in mind: machinery for tunnel boring and mining – including open-cast mining – rubber mixing equipment, steel plants and a host of stationary machines with high lubricant consumption. It can also be used to dispense selected sealing compounds.
The pump delivers high volumes of grease or oil, and uses up to 12 pumping elements. Its modular design makes it economical – and simple to both install and maintain – because it no longer requires tubing to combine two or more pump elements. A powerful 0.55 kW (400 V AC) motor ensures that delivery volumes per outlet can easily be adjusted from 150 to 1,480 cm³/hour – using a 50 Hz motor – or from 180 to 1,776 cm³/hour using a 60 Hz motor. It is sealed to IP55 class.
The pump’s maximum operating pressure is 350 bar (5,070 psi), and it works efficiently from -20 to +70 °C (-4 to +158 °F). Its 30 litre reservoir is available with an optional ultrasonic sensor for level control. An integrated stirring paddle keeps the lubricant smooth and easy to feed, even at low temperatures.
The P212 supersedes SKF’s earlier P215, which had a lower delivery volume, per pump outlet and needed these combining to achieve customer requirements. The new P212 can provide up to eight times more delivery volume per pumping element: the P212 can pump 1,480 cm³/hour, where a normal pump might handle 180 cm³/hour.
Tough applications
This increased pumping volume has led Herrenknecht, the German manufacturer of mechanised tunnelling technology, to specify the new pump on one of its tunnel boring machines – which is currently being used to construct a tunnel underneath the River Neva in St. Petersburg, Russia.
Tunnelling machines are just one example of equipment whose temporary failure – due to inadequate lubrication – has huge economic ramifications in terms of downtime, and the subsequent cost of repairs. SKF has its eye on other challenging applications as potential applications for the pump. Rubber kneading machines, for example, must combine stirring, kneading and extrusion. Their needs are highly variable, meaning that lubricant delivery volumes must be regulated through the revolution speed of the motor. SKF is already in the process of specifying such a system for Harburg-Freudenberger, a German manufacturer of rubber mixers.
Heavy-duty mining machinery such as conveyor bridges and bucket-wheel excavators are also a target for the company. Realistically, any large machine that needs a high delivery volume of lubricant could benefit from the P212 pump.
Designer benefits
The enhanced power and flexibility of the new pump offers many benefits to any design engineer looking to specify this kind of system.
Firstly, installation is made easier, cheaper and faster because there is no combining of pump elements. In addition, because pump elements are separate – and not connected to any others by tube – they can be changed more easily, so are simpler to maintain.
The P212 is also more reliable in operation because lubricant cannot flow back into the pump, even in the case of a defective back pressure valve.
Lubrication points can be supplied with adequate lubricant more easily and reliably, and also at lower cost. This can apply equally to systems that have many lubrication points, or those with lubrication points that need more lubricant because their bearings are under high load or are very large.
Other advantages include: a more stable lubricant reservoir, helping it to better withstand challenging conditions on a constant basis; greater pumping volume, thanks to the increased motor size from 0.18 kW to 0.55 kW; and increased variability – allowing delivery volumes to be adjusted easily.
There is an increasing trend in manufacturing to ‘go electric’. Whether it is ‘steer by wire’ cars or all-electric injection moulding machines, many traditional pneumatic and hydraulic technologies have been replaced with electronics and motors.
In many cases, it is justified on the grounds of accuracy, safety or efficiency. Some things however, just cannot be replicated by electronics. Until lubrication can be delivered digitally - in large enough volumes - there is still no suitable replacement for an accurate, controllable pump that can do this.
This article was originally published in the July 2015 edition of Design Solutions.

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