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CDOIF
Chemical and Downstream Oil
Industries Forum
CDOIF is a collaborative venture formed to agree strategic areas for
joint industry / trade union / regulator action aimed at delivering
health, safety and environmental improvements with cross-sector
benefits.
Guideline – Demonstrating Prior Use v4
Page 7 of 30
The decision process for the hardware fault tolerance requirements for sensors, non-
programmable logic solvers and final elements is illustrated in Figure 2. However, we
are still faced with the question, what is meant by “Prior use“?