SIL ratings set the standard for functional safety and a SIL4 risk reduction factor – the highest and therefore most demanding level achievable – isn’t normally applied in the industrial process sector. Although this change to SIL4 raised the value of the order substantially, the higher upfront costs are offset by lower risks.

IMI CCI Italy was able to achieve the SIL4 rating by applying multiple redundancy and diversity, through four sensors of different manufacturer and technology, dual Logic Solver solid state type, and three valves in series of alternative type (gate and ball) and by conducting an invasive review by a third-party agency.

Leonardo Fusi, HIPPS Engineer and Valve Doctor, said: “This is a really challenging project, but one that elevates IMI to the top level on HIPPS applications and integration. To be able to comply to a SIL4 order is a great accomplishment for our company.”

IMI CCI worked with sister companies IMI Truflo Italy and IMI STI to deliver the order and Stefano Malacrida, IMI’s Director of Business Development, Oil&Gas, attended the final audit of the finished system. “SIL4 is a tough call but also a great engineering success,” he said. “Safety is an important call, the most important one while designing a new plant. We are talking about people, we are talking about protecting lives.”

Marco from the IMI HIPPS team takes us through a functional test of a HIPPS SIL4 system in the video below.