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HIMA safety-related controllers are monitoring diverse PLT protectiveequipment in Bayer Material Science AG's new TDA production plant at the Dormagen site.
Toluene diisocyanate is a preliminary product inthe manufacture of polyurethane, a versatile plastic with a rising number of applications, e.g. in the automotive and furniture industries.A total of ten controllers of type H51q-HS will be used in the entireplant as emergency shut down systems (ESD) and also as a burner management systems (BMS) in the TAREX (thermal air purification for potentially explosive substances) plant area. Besides the good experience with HIMA safety technology from projects in the past, the feature "Maintenance Override" was a crucial factor for the customer's decision in favour of the H51q-HS systems.
The eight systems for the TDA plant and the two systems for the connected thermal air purification processapproximately 6,500 I/Os or 300 I/Os from a safety aspect. The processcontrol of the entire plant takes place via the DeltaV control systemfrom Emerson. H51q-HS is a modular and extendable safety system withTÜV-approved, maximum available CPUs for applications up to SIL 3.
Maintenance Override are bridging systems which permit the operator of a plant to bridgeover a sensor or actuator when the plant is inoperation for carrying out maintenance work or function tests. This happens for a defined period by means of a special enable switch in themeasuring station. This concept represents a major reduction in the work and expense incurred by such interventions in the process.
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