Netherlocks has received an Ex certification for the Faith partial stroke testing system, recognising the addition of a dedicated grounding means for the system. The Faith partial stroke product categorisation with this certificate is now as follows: CE Ex II 2 G D c IIC T4. The device uses mechanical pins to limit the degree of valve closure, allowing an easy, safe testing of system-critical components such as ESD (emergency shut down) and HIPPS (high integrity pressure protection system) valves without affecting normal online process or operation. There is no risk of test angle overshoot or process interruption, the test can be per- formed at real speed and will always return results. For most cases, the Faith is suitable for SIL3 applications, with an FMEDA (failure modes, effects and diagnostic analysis) assessment carried out by Exida showing 0 fail safe detected, fail safe undetected and fail dangerous detected conditions recorded from the test.
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