Central Lubrication System Applications by Process Area
A central lubrication system is usually specified at the plant or machine level — "a lubrication system for our steel plant" or "for our paper mill." But the actual engineering decision is made at the process-area level: a rolling mill stand, a press section, a dryer cylinder bank, a boiler feed pump, each has a different point count, duty cycle, temperature, and contamination environment, and each needs the lubrication system designed around it rather than a generic plant-wide spec. This article covers the process areas we get asked about most often and what differs about the lubrication requirement in each.
Rolling Mills
A rolling mill stand has a large number of heavily loaded bearing points — roll necks, chocks, gear couplings, and screw-down mechanisms — running continuously under high radial load. Grease is the standard choice here, delivered through a progressive distributor block system so that a blockage at any single point is self-detecting rather than silent. Because mill stands run 24/7 in continuous production, the lubrication interval is usually short and the system needs a working float switch and pressure switch so a fault triggers an alarm rather than being discovered on the next manual inspection round.
Press Sections
Press sections — power presses, forging hammers, forming presses — combine high shock loading with a large number of lubrication points spread across the frame, ram guides, and die area. The shock loading makes reliable metering important: an under-lubricated guide surface wears quickly under repeated impact. A progressive block or dual line system is typically used depending on point count and distance from the pump station, with metering cartridges sized individually for guide rails versus die pins.
Forming Sections
Forming section machinery — rolling, bending, and forming lines — runs at moderate speed but with high contact pressure between tooling and material. Contamination control matters more here than in most other process areas, because forming operations generate metal fines that can enter the lubrication circuit through worn seals. An in-line filter and a well-maintained suction strainer are essential — a blocked metering cartridge on a forming line usually traces back to contaminated lubricant rather than a mechanical fault.
Dryers
Dryer cylinder bearings — common in paper and textile plants — operate at elevated temperature, which changes the lubricant selection and the tolerances on the metering system. Oil is generally preferred over grease for dryer sections because it dissipates heat better and doesn't harden at sustained high temperature. An oil circulating system with return-line filtration is the standard configuration, continuously recirculating and cooling the oil rather than dosing and discarding it.
Boilers
Boiler auxiliary equipment — feed pumps, fan bearings, coal handling drives — is a mixed-duty environment: some points run continuously, others intermittently, and the ambient environment is often dusty or humid. A motorized lubrication unit with an electronic timer lets each zone be scheduled independently rather than forcing every point onto the same interval, and a sealed reservoir with a proper oil filler cum air breather keeps ash and dust out of the lubricant during top-up.
Pelletizing Presses
Pelletizing and briquetting presses run rollers and dies under continuous high compressive load, similar in character to rolling mills but typically at a smaller point count. Grease lubrication through a progressive or single-line system is standard, with the metering dose set higher than on lighter machinery because of the load and the abrasive nature of the material being pressed — die and roller wear is accelerated by any lubrication shortfall, so a working pressure gauge at the manifold is worth checking on every shift.
Wood Yards
Wood yard equipment — debarkers, chippers, conveyor and crane bearings — is spread over a large physical area, often outdoors, and exposed to bark dust, moisture, and wide temperature swings. Long-distance dual line systems are typically used to reach bearing points spread across cranes and conveyor runs from a single pump station, with grease preferred over oil for its resistance to washout in wet outdoor conditions.
Choosing a System by Process Area, Not Just by Plant
The common thread across all of these is that "one lubrication system per plant" is rarely the right way to specify it. Point count, duty cycle, temperature, and contamination environment differ enough between a dryer section and a press section in the same plant that they're better treated as separate lubrication zones, even when supplied and commissioned as part of one project. See our guide on how to select a centralized lubrication system for the underlying selection criteria, or contact us with your process area and point count for a specific recommendation.