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Partial stroke testing
Critical valve partial stroke testing using SVM
In this article, Richard Harvey (Rotork Fluid Systems) explains the increasing scope for critical duty valve testing provided by innovative partial stroke technologies. ...
High-pressure partial stroke and diagnostics system for remote actuators.
Intelligent valve controllers, with diagnostics and partial stroke capabilities, offer significant opportunities to collect and analyze the data on pipeline valves, actuators and controls, thereby improving reliability and safety. The instrumentation industry has recognized the need and significance of intelligent diagnostic devices in the low pressure segments. Standardized products such as the DVC are available off the shelf to meet these market needs. There is a need for a standard product in the highpressure and hydraulic segment. This article discusses some of the industry requirements for a High Pressure Partial Stroke and Diagnostic (HPSD) system. Technical paper written by Shailesh Sharma, Emerson Process Management ...
Increasing safety - combining partial stroke testing and solenoid valve testing
Klaus-Peter Heer (Siemens AG Karlsruhe) writes that many valves are used very rarely in practice, such as safety valves, which only have to open or close in an emergency. Their friction may increase in the course of time, especially the initial break-off force or torque of linear and rotary actuators respectively as a result of corrosion or increasing encrustation of the plug stem. The consequence is that the valves often block when they are required in an emergency situation. This article provi...
Partial Stroke Testing: Safeguarding valve systems
Partial Stroke Testing (PST) technology has become a major criteria in most new process systems where actuated valves are used to safeguard the system – for example with High Intensity Pressure Protection System (HIPPS) and Emergency Shut Down (ESD) valves. These vital fail-safe systems, by their very nature, will often sit for long periods without being used, and this can lead to degradation in the valves’ operability. If one had become worn or stuck, then a real emergency would not be a good t...
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