Questions & Answers Archive
There are many manufactures of mechanical devices (valves, actuators, etc) that claim that their devices can be used in SIL 3 applications. In this post I am going to explain that most mechanical devices actually will never achieve SIL 3. In …
Even though safety is in first instance a management responsibility, you can make the difference. The future of safety is in your own hands. You can make a difference by taking responsibility.
There are always 4 professionals involved in functional safety work. One to do the work, one to verify, one to assess, and one to manage.
SIL Lifecycle In the functional safety world we perform our work according to a lifecycle. Typical functional safety standards, like IEC 61508, IEC 61511, and so on, include the lifecycles, but they are usually not very practical. The IEC 61508 …
End users need to proof test their safety functions to make sure they still work as specified. Many end users struggle with the question how often a proof test needs to be carried out. Especially in the process industry were …
More and more the question comes whether operators can be part of the safety instrumented function? And if yes, what is the PFD of an operator? What are the problems and what to pay attention to when doing so.
Wonder whether redundancy is the same has hardware fault tolerance (HFT)? Want to know how voting influences HFT and redundancy? In this post we explain what redundancy, HFT and voting is and how they influence each other.
