Cavitation detection.

Yokogawa has developed a cavitation detection system and will be available next month (Feb 2019). 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.

Components of Cavitation
Inspection System

Directed at sectors such as oil, petrochemicals, chemicals, iron and steel, pulp and paper, water supply and wastewater treatment, pharmaceuticals, food, etc., it will aid maintenance of plant facilities such as pumps that tend to deteriorate due to cavitation.

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.

The new product features:
1. 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.

2. Troubleshooting - 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.

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