Zwick Emergency Shutdown Valves (ESD) with Partial Stroke Testing (PST) solutions are designed to meet the requirements and standards of High Integrity Protection Systems (HIPPS). HIPPS is a type of safety instrumented system (SIS) designed to reduce the risk that can arise if the pressure of a system exceeds its design pressure.
A need for HIPPS valve solutions are typically found in industries such as Synthetic Fuels, Chemicals as well as Oil & Gas. Whether the application is in a chemical processing plant or a refinery, containing the loss due to over pressurisation is of critical importance. Heavy duty SIL 3 scotch yoke actuators with a closing time of <1 sec are readily available. Should pressures in a chemical process plant be exceeded, hazardous, explosive or toxic chemicals may be released into the atmosphere threatening lives and endangering process plant and the environment.