Two new calculation modules in Metso’s Nelprof 6 valve sizing software are designed to enable the selection of intelligent automated on/off valves and emergency valves. Special safety requirements, such as an actuator-sizing safety factor, can be evaluated with the new tools in this latest version of the program. Selection options include automated on/off and emergency valve selection, performance analysis, and valve controllability in a closed control loop. The module also includes multi-phase flow sizing, as well as noise and cavitation prediction analysis. By using the tool, users can select the actuator more quickly and accurately in the engineering phase, compared to conventional actuator selection. The SIL module for final element PFD (Probability of Failure on Demand) calculation allows both 1-1 and 1-1D (D standing for diagnostics) final-element calculation that takes into account the use of a valve, an actuator and the partial-stroke test device.
