Amersfoort, The Netherlands, 17 January 2019
Yokogawa Electric Corporation has announced that it has developed a cavitation detection system and will be available commencing January 31st. By detecting cavitation, quantifying information, and displaying the data in real time, this system provides an early indication of conditions that can result in a degradation in pump performance. By detecting problems early, before damage occurs which can cause an increase in both vibration and noise levels, this solution improves the efficiency of plant maintenance.
Cavitation in fluids can cause damage to pumps. To minimise this damage, it is necessary to detect cavitation at an early stage and take corrective measures such as adjusting the flow rate. One issue, however, is that there has been no way to quantify cavitation. In addition, since cavitation occurs inside equipment, it is impossible to visually check whether this is occurring. Cavitation is usually detected by field personnel who rely on experience gained on the job to detect changes in vibration and noise levels that are caused by excessive cavitation. However, even highly experienced plant personnel and specialists can miss these early signs, and such problems may go undetected until the inevitable increase in vibration and noise occurs.
In its analysis of this problem, Yokogawa has focused on the principle that there is a direct relationship between differential pressure and cavitation, and has created a condition monitoring solution that involves the quantification of cavitation based on pressure data.
- Real-time detection
The system that Yokogawa has developed consists of a STARDOMTM FCN-500 network-based control system, a Yokogawa cavitation detection logic program, and a highly accurate (±0.075%) DPharp EJX110A differential pressure transmitter, and relies on the FOUNDATIONTM Fieldbus industrial digital communication standard to link these components. At 100 ms intervals, the DPharp transmitter measures the pressure inside the target equipment, and this data is transmitted via the fieldbus network to the STARDOM FCN-500 system for processing in real time by the logic program. This system is therefore able to detect cavitation issues early on, allowing field personnel to take quick remedial action by, for example, reducing the flow rate to a level that suppresses cavitation without interfering with production line operations.
Note: There is no universal indicator for the extent of cavitation and these are only rough descriptions of the different levels of cavitation.
Valves, pumps, and other types of plant equipment can all experience problems such as cavitation which are caused by anything from the opening/closing of a valve, a change in viscosity level or some other physical property of a liquid, or a change in the external environment. Field personnel have traditionally relied on their own experiences and the use of analytical tools to find out what is causing these problems. Thanks to the development of this new system, field personnel will now have a tool that will help them troubleshoot problems with greater efficiency by identifying and quantifying cavitation in plant equipment.
Major Target Markets
Oil, petrochemicals, chemicals, iron and steel, pulp and paper, water supply and wastewater treatment, pharmaceuticals, food, etc.
Maintenance of plant facilities such as pumps that tend to deteriorate due to cavitation
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OpreX is the comprehensive brand for Yokogawa's industrial automation (IA) and control business. The OpreX name stands for excellence in the technologies and solutions that Yokogawa cultivates through the co-creation of value with its customers, and encompasses the entire range of Yokogawa's IA products, services, and solutions. This brand comprises the following five categories: OpreX Transformation, OpreX Control, OpreX Measurement, OpreX Execution, and OpreX Lifecycle. The real-time cavitation detection system is an OpreX Asset Management and Integrity family solution in the OpreX Transformation category, which delivers operational excellence throughout an enterprise's activities, from production through to supply chain optimization and risk and business management.
With this brand, Yokogawa will deliver integrated solutions that address specific needs and support its customers in their efforts to transform and grow their businesses.