condition monitoring Transmitters earn ‘intrinsically-safe’ approval
UK-based condition monitoring specialist Sensonics has enhanced its DN803X series shaft vibration and thrust position transmitters, gaining approval for intrinsically-safe applications. The DN8031 (vibration) and DN8033 (thrust position) proximity probe systems are now suitable for Ex ia IIC T4 applications when used in conjunction with Sensonics’ ATEX- approved range of AECP proximity probes and AEXC extension cables. The 4-20mA loop powered modules
are said to be easily integrated with either the local machine PLC or a plant-wide DCS since they are powered through the safety barrier measurement loop. All signal processing is carried out within the unit, providing an output current proportional to either peak-to-peak shaft vibration or relative position to the probe face. Adjustment of both gain and offset is facilitated for ease of calibration to suit the application.
Smaller pumps and compressors will particularly benefit from the DN803X series which, if combined with Sensonics’ range of compact machine-mounted housings, provide cost-effective solutions for critical operational measurements using a straightforward interface requiring no local power supply. The driver also
Fluid CM service from Finning
An engine fluid and condition monitoring service is offered by Finning Power Systems, the UK’s sole supplier of Caterpillar marine engines, as a form of preventative maintenance to protect profitability and reduce downtime. According to Finning, 50 per cent of all engine problems are associated with cooling systems but often overlooked. By analysing the condition of the coolant composition, however, long-term engine damage and resulting repair costs can be avoided. Available for any engine or transmission, the company’s fluid and condition monitoring service offers operators an insight into the performance of their machinery and provides interpretations and recommendations for action.
Customers using the service on a regular basis can achieve a return on investment of around 10-fold, Finning claims, depending on the environment and application, since the cost of sampling is minimal compared with a major repair or component replacement. Analysis is based on a small amount of fluid – including oil, fuel and coolant – taken from
82 I Marine Propulsion I February/March 2012
Sensonics’ Sentry G3 protection monitors and proximity probes are installed for online monitoring of steam turbines at a Chinese steel plant
provides a raw buffered output of the vibration signal that can be exploited through portable analysis equipment for a more detailed picture of the machine’s dynamic performance. Sensonics offers a range of vibration
the engine by the operator (there is no need for a service engineer).
Finning recommends that samples are
taken every 250/500 working hours. The fluid sampling kit includes a length of tubing that can be cut to size and simply plugged into the relevant engine compartment, with the sample pot and a vacuum pump attached to its other end. Samples can then be posted back to Finning, whose diagnosticians perform a series of element tests and interpret the results. Among the problems that such fluid analysis can highlight is fuel dilution, an increase in copper and iron content, and sudden deterioration in particle count. Deteriorating oil condition is another common finding, usually traced back to failing seals and bearing damage; as a result, aluminium or copper would be visible in the oil or filters. In such a case, Finning recommends the engine is stopped for repairs to be carried out. As well as reducing the risk of major repair work, fluid sampling can help in maximising engine efficiency. Optimising the fluid life-cycle through careful monitoring and implementing a contamination control system ensures that the system remains clean.
monitoring systems based on both contact and non-contact techniques for accurately measuring absolute and relative vibration from machines. The sensors include accelerometers, velocity transducers and eddy current proximity probes.
ThrusterSCAN systems to serve Transocean rig
Kittiwake’s ThrusterSCAN online condition monitoring system for azimuthing thrusters will be installed on Transocean’s eight-thruster Development Driller III rig. Continuous monitoring of wear debris, water ingress and lube oil quality ›››
Kittiwake’s ThrusterSCAN monitor
www.mpropulsion.com
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