Production • Processing • Handling
whilst the valve is moving. Any change in the valve performance is detected and identified by a change in the pressure wave exiting the actuator. Te simple, self-contained design of the SVM enables it to be used with the most complex control mechanisms and makes it impossible for the SVM to prevent the valve from closing on demand. Analysis of the 4-20mA signal from the
pressure transmitter during the partial stroke test is performed using SVM software to confirm the correct functioning of the valve or identify a fault. To achieve this, the output pressure curve of the transmitter is compared with the pressure signature of the actuator, obtained during commissioning. Identified faults can include valve obstructed, damaged actuator cylinder, seized valve or failsafe spring failure, stem shear or disconnected valve, stiff valve, increased breakout torque, damaged valve seat, internal cylinder corrosion, exhaust restriction and sticking solenoid valve. Te SVM tests every final element component of the shutdown system and is therefore capable of detecting all the failure modes of the valve, actuator and controls that are possible during a partial stroke test. It is designed to ensure operators obtain the maximum safety performance from systems while running plants at maximum efficiency. Te benefits of using the SVM are not limited to simply reducing the probability of valve failure
Fig. 2. Typical Rotork SVM installation schematic.
on demand. Gains can be made capitals cost and plant performance. For example, the requirement for costly redundant valves can be reduced or eliminated. Production can be enhanced by extending periods between compulsory plant shutdowns and predicting potential valve failures, enabling the pre-ordering of spare parts and identification of maintenance priorities. ●
For more information ✔ at
www.engineerlive.com/iog
Richard Hudd is with Rotork Fluid Systems, Bath, UK.
www.rotork.com
Pipe down? NaviSuite Nardoa
The NaviSuite Nardoa is a cutting-edge, completely integrated 3D software solution for acquisition and processing of data during pipeline and cable route inspections.
This proven, off-the-shelf software bundle allows you to save man-hours and money while delivering high-quality, thorough and comprehensive inspection results to your customers.
www.eiva.com/Nardoa eiva@eiva.com • +45 8628 2011
NaviSuite-Nardoa_Pipe-down_185x121.indd 1 For more information ✔ at
www.engineerlive.com/iog 20-06-2013 09:06:52
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