Wärtsilä REsafe Oil OCS Bearing

The Wärtsilä REsafe OCS bearing series is the composite alternative to oil or grease lubricated white metal or roller element bearings, traditionally used for guide bearings in rotating equipment. The Wärtsilä REsafe OCS composite material is low friction, kind to shafts and will not seize in the event of water ingress into the bearing/shaft interface. 

Wärtsilä REsafe OCS bearings are available as bushes, shells or segments and can be supplied as part of a package, retained in a housing and tailored for easy installation.  The housing can be made from aluminium bronze, cast iron or carbon steel or Wärtsilä’s new light weight and strong structural composites which can reduce the weight of the housing by up to 75%, without detriment to its strength, support or operation and vastly improves both the safety and operational elements of installation, commissioning and maintenance.  Both housings and bearings can be fully split for easy assembly with the shaft left in-situ. 

Wärtsilä’s in-house material science development strategy combined with product manufacturing and quality control standards, ensure that lead-times are controlled and the product is highly customisable.

Due to the superior material quality of Wärtsilä composite bearings, they are inherently kinder to shafts and cannot seize in the event of water ingress, unlike more expensive white metal or roller element bearings.  The bearing material also has a very low co-efficient of friction (CoF) both wet and dry running, reducing the amount of power lost between the rotating shaft and the bearing.  This low CoF (μ) reduces the wear rate of the bearing, giving an extended operating life and reduction of through life costs.

Application/Options:
Industrial applications including process industries, power generation, mining etc.
Hydropower & tidal power turbine guide bearings, guide vane and linkage bushes and pumps

Shaft guide bearings are a critical part of any rotating equipments’ operation.  Small running clearances between shaft and bearing can be achieved through use of a Wärtsilä REsafe OCS bearing, due to its low thermal expansion and swell rates, which in turn reduces potential shaft vibration. 

A unique Wärtsilä feature of the bearing is that it can be provided as a hybrid [combined] or packaged shaft system incorporating the appropriate oil/grease lubricated seal.  Wärtsilä can also provide a full turnkey turbine/plant level conversion from oil / grease to water to enhance future compliance with regulation and to stabilise costs of operation associated with seals and bearings (see Wärtsilä REsafe Water WCS Bearing). 

Wärtsilä REsafe OCS can also be used for oil or grease lubricated wicket gate and linkage bushes, wherever plain bearings are required.  Our bearing packages can also be supplied with sensors to track performance [like wear and temperature] and inputs into plant level planned maintenance systems.

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