Autopro Blog

What is a CHAZOP? [video]

January 22, 2018


A correctly functioning control system is critical to the safe, efficient operation of a facility.

In this video, Sam Kozma, Safety and Control Systems Specialist, explains the differences between a HAZOP and a CHAZOP, and why a CHAZOP is a necessary step.

What is the difference between a HAZOP and a CHAZOP?

The difference between a HAZOP and a CHAZOP really is the focus. A HAZOP looks at the entire facility, the mechanical equipment and the process, where a CHAZOP looks at the control system itself.

A HAZOP typically assumes that the control system is operating correctly, whereas a CHAZOP goes into the control system and fails individual components.

Why Conduct a CHAZOP?

We do a CHAZOP to identify single points of failure, to identify potential failures and help operations recognize those failures. This gives them an opportunity to react faster and get maintenance on the job faster, with the goal primary goal being to minimize downtime and production outage. This is especially important in critical control applications where we can add a little bit of redundancy for a small price, where a failure could lead to a significant outage of a day or more.

What is the difference between a coarse CHAZOP and a detailed CHAZOP?

The difference between a coarse CHAZOP and a more detailed CHAZOP is not only timing, but also the focus. A coarse CHAZOP looks at a very high level block diagrams very early in the design stage to determine whether there are any significant issues that we can correct early in the process.

A detailed CHAZOP happens later and looks at every element, so we look at I/O modules, CPU servers, networks, and different layers of communication, to try and determine individual failures and what they look like, what to do about them, and how to safeguard against them.

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