High Quality Content by WIKIPEDIA articles! Partial stroke testing (or PST) is a technique used in a safety instrumented system to allow the user to test a percentage of the possible failure modes of a shut down valve without the need to physically close the valve.IEC61508 adapts a Safety life cycle approach to the management of plant safety. During the design phase of this life cycle of a safety system the required safety performance level is determined using techniques such as Markov analysis, FMEA, Fault tree analysis and Hazop. These techniques allow the user to determine the potential frequency and consequence of hazardous activities and to quantify the level of risk. A common method for this quantification is the Safety integrity level. This is quantified from 1 to 4 with level 4 being the most hazardous.

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