CONDITION MONITORING Choose the right lubriCation
To maintain rollability, it is vital that bearings are lubricated sufficiently and to a suitable fill level dependant on torque, speed and load requirements. Equally the type of lubrication should be carefully considered for the application, based on temperature, speed and environmental conditions. If bearings are found to be inadequately
lubricated, or filled with an incorrect grease, manufacturers should contact a bearing supplier to inquire about bearing relubrication. SMB Bearings, for instance, has an in-house relubrication service which can clean and refill bearings with a new lubricant.
Pay attention to radial Play
The bearing’s internal clearance can make a big difference. Choose tighter clearances for accurate running, but beware of any temperature differences that reduce internal clearances during operation. Choose looser clearances where interference fits are used or there is slight misalignment between shaft and housing.
MACHINERY PROTECTION SYSTEM MEETS DEMANDS OF TOUGHEST AUDITS FOR TURBINE UPGRADES
Established and proven monitoring systems like the Sentry G3 machinery protection system from Sensonics combines the flexibility of hardware in a single, easy-to- install and easy-to-use module type for all sensors and so is a highly effective solution. The system is compliant to API 670 so meets the most stringent protection requirements, in addition to meeting IEC 61508 up to SIL-3 standards. The Sentry G3 system is being
T KeeP to load limits
As tempting as it may be, end users should avoid using a bearing close to its maximum load capacity. Bearing load ratings are only a guide. In reality, bearings should be used at around a tenth of the dynamic load rating if long life is required. Heavier loads can be tolerated, but the bearing lifespan will be shortened, as identified later by vibration analysis.
handle with Care
Fitting the bearing inner ring on to a shaft by pressing on the outer ring, transfers the fitting force via the balls, which will damage the raceways. Similarly, a heavy shock load can occur when the bearing is dropped on to a hard surface which can also cause damage, leading to high levels of vibration. Condition monitoring is becoming more
prevalent and this technology allows for early identification of bearing problems but, by taking precautions to prevent issues arising in the first place, machine builders can ensure their bearings are fitted to last.
SMB Bearings
www.smbbearings.com
continually developed to meet the ongoing challenges and also those arising from specific applications, such as for gas turbine upgrades at major UK nuclear power stations. For these applications ‘Emphasis’ audits are considered to be the most complex and rigorous (for software) and users will be assured that Sentry G3 meets these standards. The emphasis method assesses a device’s compliance with IEC 61508 for functional safety standards, along with other requirements specific to the UK nuclear industry. It provides end-users with the confidence that both the hardware and software components in these protection systems meet the required high levels of design, testing and production which minimises the risk of systematic failures. Advanced features include; vibration,
position and speed parameter trending facilities, including log and view of up to 60 days of data, ‘look back’ at trends and alarms, plus download data for further analysis in Excel. It is also now possible to directly view proximity probe gap and vibration transducer bias voltages, to verify correct transducer operation and calibration.
he ability to quickly identify issues affecting the performance of rotating plant as well as being able to optimise dynamic behaviour is vital to all plant engineers.
The Sentry G3 single module concept
minimises the need for spares holdings helping to reduce ongoing maintenance costs whilst also lowering the risk in retrofitting applications where the need to interface monitoring systems quickly and correctly with previously installed sensors is key. The system is fully software programmable
and upgradable which ensures adaptability moving forward as inevitably application requirements change. It’s also easy to expand, simply by adding additional G3 monitors. It offers excellent channel density with up to 24 measurement channels housed in a compact rack mounted format which can halve the space needed on existing installations. Multiple outputs are available on the back of the rack for up to three alarm levels and two analogue outputs per channel. Dual redundant Modbus communications to a module level provide a robust communication system, while the in-built LCD display offers readings, sensor integrity voltages, trending and FFT, all of which confirm the accuracy of the installation. In summary, Sentry G3 provides state-of-
the-art, flexible, easy-to-install and maintains space-saving protection for the following modes: Measurement (Absolute bearing and relative shaft vibration, shaft position and thrust wear, speed, phase and reverse rotation, differential and casing expansion, rod drop and temperature).; and Turbine Specialist Measurement (Shaft eccentricity, order tracking, dynamic pressure and mark - space differential expansion). The additional features incorporated into
the latest Sentry G3 system ensures more than just machine protection, providing a set of tools to assist plant engineers to optimise the control and management of their rotating plant now and into the future. Sensonics
www.sensonics.co.uk
INDUSTRIAl COMPlIANCE | jANUARY/FEBRUARY 2022 33
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