Systems continue to get more complex, and with a larger number of systems in any given plant combined with a knowledge pool continuously depleting through retirement, the risk of safety critical mistakes understandably inch upward.
One counter-measure to negate this risk is a reduction in system complexity and the number of systems used.
Just take a look at Dow Chemical. For a long time the Midland, MI-based chemical giant used a combined basic process control system and safety instrumented system (BPCS/SIS) logic solver platform.
Dow’s proprietary home grown computer system is TÜV certified for SIL-3 plus BPCS control (providing they follow the safety manual). The company successfully used it this way since the mid-1990’s and they now have hundreds of installations utilizing this concept.
Download this eGuide: Safety System Compliance with Today’s Safety Standards to learn more about articles like this one, Independent, But Connected and to learn how changes in safety standards are affecting legacy systems with the following articles highlighted in this Control Engineering eGuide: