Oil Circulation Lubrication Systems
Oil is pumped to the bearings, drains back to a tank, and is filtered and cooled before going round again. The oil carries heat and wear debris away, which is what separates this from any once-through method. SES holds the range as an authorised SKF distributor, covering flow rates A few litres to hundreds of litres per minute; oil grades ISO VG 32 to VG 460 by application; filtration Typically 10 to 25 micron, finer for turbines; cooling Air blast or water-cooled heat exchangers. Executions include standard circulation units, units with air blast coolers, units with water-cooled exchangers, duplex filtration executions, among others. It is specified most often into paper machine dryer and press section bearings and rolling mill work roll and backup roll bearings. Every part is genuine SKF through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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From integrated steel plants to power utilities and EPC majors — the works that cannot afford a counterfeit part specify through SES.
Circuit
Pump, feed, return, tank, cooler, filter
Main benefit
Heat and debris removal
Monitoring
Flow, temperature, pressure, oil condition
Return
Gravity, needs fall on the return line
Where it runs.
You will find Oil Circulation Lubrication Systems in the parts of a plant where this particular duty actually occurs. In practice that means paper machine dryer and press section bearings, rolling mill work roll and backup roll bearings, large gearboxes on mills and kilns, and equally turbine and large compressor bearing sets, continuous casting machine segments, heavy fan and blower bearing housings. What links them is the duty rather than the machine name — circuit: Pump, feed, return, tank, cooler, filter. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the SKF range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. Bearing housing is running hot with no obvious mechanical fault — Circulation with a cooler sized on heat load rather than on flow. Grease or a static oil bath simply cannot carry that heat out of the housing. Process area generates fine scale or fibre that gets into the oil — Duplex filtration that can be changed on line, plus a magnetic element. Shutting a mill to change a single filter is how filters end up never being changed. Return lines have to run a long way to the tank — Generous return pipe bore with continuous fall, and check it on the drawing. Restricted returns flood the housing, and the seal then leaks oil onto the floor. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Size the tank for dwell time, not for how much oil you want to hold. Oil that goes round too quickly carries its air and water straight back to the bearings, and the foam is then blamed on the oil supplier.