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NSK’s series of bearings for petrochemical applications is designed to reduce operating costs by increasing mean time between failures (MTBFs) on critical equipment.

Such equipment could include centrifugal pumps, air-compressors, gas compressors, blowers and ventilators.

The bearing solutions address the demanding and hostile environments where pumps and compressors are used, and are routinely exposed to heat, chemicals, oils and gases, including refrigerants and ammonia gas.

They include the EM/EW cylindrical roller and HPS series of angular contact bearings.

These bearings are designed to provide support for the helical rotors used in gas and air compressors, offering higher levels of heat tolerance, chemical stability and increased load-carrying capacity.

In both types of bearings, substantial improvements in load capacity have been achieved.

Basic dynamic load rating has been improved on the cylindrical roller bearings by as much as 30 per cent and on the HPS angular contact bearings by a maximum of 20 per cent when compared with conventional bearing types.

The result is a substantial improvement in fatigue life for both types of bearings, enabling users to benefit from longer, trouble-free operation and extended intervals between overhauls.

Substantial performance improvements are also provided on centrifugal pumps with NSK’s HR series of high-capacity deep-groove ball bearings.

The HR series features an internal design, allowing for larger rolling elements than standard deep-groove ball bearings; at the same time retaining standard external dimensions to ISO standards.

This new design enables the HR bearings to deliver increased dynamic load ratings, by seven to 19 per cent (depending on size), resulting in a 22 to 68 per cent increase in ISO life.

As a result, the HR series can significantly improve the operating life of pumps, minimising downtime without involving the pump operator in any costly changes to standard bearing dimensions.

Also designed to enhance pump performance without cost fitment issues are NSK’s Anti-Creep bearings.

Easy to fit and requiring no special machining of housings, these bearings provide an effective solution to the problem of creep, which is the result of loads becoming excessively high on the driving shaft of a pump.

With this design, the frictional force of the O-rings helps to prevent the occurrence of creep and subsequent damage to the shaft of the pump upon which the bearings are fitted.

In addition to delivering improved MTBF in standard pumping and compression applications, NSK’s petrochemical bearing package also addresses particularly demanding and arduous pumping tasks.

The Spacea LNG series bearings are designed for use in pumping liquid nitrogen gas (LNG) and have been developed to operate at speeds of up to 3,600rpm while immersed in the gas at -162C, with lubrication provided by the cryogenic agent itself.

In order to cope with rigorous lubricating conditions, the LNG bearing material offers low-temperature characteristics and abrasion resistance.

The bearings’ inner and outer rings and balls are made from high-corrosion-resistant steel (AISI440C), which is heat treated to ensure that it remains dimensionally stable at low temperatures.

The bearing cage is made from Fluororesin, a material that is self-lubricating, even at very low temperatures.

NSK has detailed its bearing products for the petrochemical industry in a new publication.

NSK’S INTEGRATED TECHNOLOGY PLATFORM DRIVES INNOVATION..

NSK, a global leader in motion and control products, has developed and continuously upgrades four core technologies: tribology, material engineering, analysis technology and mechatronics, to provide the platform for the company’s innovative product developments. This technology platform provides the basis for the design of NSK’s rolling bearings, automotive components and precision parts. In addition, by integrating these advanced technologies, NSK is able to respond quickly and effectively to customer requirements across all key sectors.

NSK is a driver of new technology developments, with a full line-up of products spanning general industrial, automotive and precision parts industries. These include bearings for mechanical and electrical machinery, IT and aftermarket; innovative automotive products such as electric power steering (EPS) automatic transmission components, steering columns and other steering related products; and precision linear motion components such as linear guides, ballscrews, X-Y tables, mechatronic products and Megatorque motors.

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