TPi January 2018

Valves , f i t t ings , f langes & connectors

SKF delivers its largest sealed spherical roller bearing to Peruvian customer

The customer’s sealed SRB will be fitted to a horizontal shaft and will operate in extremely dusty conditions, with very fine stone dust from both the desert location itself and the grinding processes posing a major contamination risk. The roller press is a highly loaded application (C/P of 2-3) subject to frequent shock loading; the predominantly

SKF’s factory in Gothenburg, Sweden, has produced the company’s largest sealed spherical roller bearing (SRB) to date. The 241/900 SRB is 50 per cent larger and three times heavier than the previous largest SKF sealed SRB. Destined for a Polysius Polycom 8 roller press at a large copper mine in Peru, the three-tonne 241/900 sealed SRB is dimensionally equivalent to a standard SKF non-sealed version, with inner diameter (bore) of 900mm, outer diameter of 1,420mm and width of 515mm. The seal itself consists of a rubber over-moulded steel plate with the same profile and offering the same characteristics as those currently used with existing SKF sealed SRBs.

which comprises premium SKF sealed SRBs housed within sealed housings containing a barrier grease. The record-breaking sealed SRB was designed and manufactured within a tight, six-month schedule by a team led by project manager Daniel Ortega. SKF is a global supplier of bearings, seals, mechatronics, lubrication sys- tems, and services that include technical support, maintenance and reliability services, engineering consulting and training. It is represented in more than 130 countries and has around 17,000 distributor locations worldwide. SKF – Sweden www.skf.com

radial loads, when coupled with the high level of contamination at the site, poses a significant risk of early bearing failure. SKF’s custom-made seal aims to at least double the bearing service life by reducing the risk of contamination.

The performance of the seal for this size of SRB remains to be verified in service by the customer, but the same seal design used in smaller SRB sizes has achieved a service life of at least double that of an open, non-sealed bearing. Even longer service lives of around three to five times that of a non- sealed bearing can be achieved with SKF’s ‘Three-Barrier’ bearing protection solution,

One-way valve designed for specific flow rate and pressure

PurgeGate has found applications in the welding industry, where inflatable devices are used for weld purging of tubes and pipes. Setting flow rates and pressures on gas regulators can be interfered with by personnel distant to the welding process, who might move the controls without realising the harm that can be done. If inflatable devices burst during a weld, the loss of protective gas can cause an expensive and inconvenient repair. Huntingdon Fusion Techniques – UK

PurgeGate ® from Huntingdon Fusion Techniques (HFT) is a one-way valve designed and constructed to pass a maximum of 7.5 litres/min and 0.5 bar pressure. Other versions for 1 bar and greater are also available. The valve has applications in both fluid and gas control. Its small size and low weight makes it suitable for small liquid dispensing machines, as well as large machines with multiple heads, where higher pressures and flow rates might be used to cater for the output of a multi-head machine.

hft@huntingdonfusion.com www.huntingdonfusion.com

PurgeGate fitted with PurgElite inflatable weld purging system

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January 2018 TUBE PRODUCTS INTERNATIONAL