Ebook: HAZOPs Should Be Fun! The Stream-Based Hazop


HAZOPS ARE NOT FUN!  MAYBE THAT’S NOT A PROBLEM, BUT THEY ALSO DON’T ACHIEVE WHAT THEY COULD AND THAT IS A PROBLEM. WHY DON’T WE LEARN WHAT WE SHOULD FROM HAZOPS? 

  • Tunnel vision. The focus on small nodes obscures the big picture.

  • Guideword excess – Flow, pressure, temperature, and level are usually discussed in the HAZOP. But flow deviations cause most pressure, temperature and level deviations.

  • HAZOPs are supposed to identify operability issues, but they really don’t.

  • Risk assessment in HAZOPs is typically difficult, ambiguous and not repeatable.

  • HAZOP reports are difficult to read and are of limited use.

  • Most people don’t enjoy HAZOPs and that impacts participation.

GATE Systems Engineering Manager Howard Duhon has been developing this process for the past 20 years.  The GATE Stream-based HAZOP process avoids these pitfalls via some novel modifications to the process.

HAZOP-2.png

Stream-Based Nodes

The main difference between the GATE Stream-Based HAZOP and a typical HAZOP is that we define nodes based on ‘streams’ for the FLOW deviation discussions.  For this purpose a stream is a continuous flow of fluid across piping and equipment items.  For example: oil production from the reservoir all the way to the dry oil tank can be considered one stream-based node.  A change in flow anywhere in the node affects the flow everywhere, or at least downstream.  This allows us to ask much more interesting questions that are hard to tackle in a typical HAZOP with small nodes.  Issues like startup, shutdown, commissioning, sampling, chemical injection, spec breaks, recycle are much more meaningful at the stream-based level. 

Equipment-Based Nodes

We do, however, have to resort to the typical equipment-based nodes for the temperature, pressure and level deviation discussions.  But we do all the stream-based node discussion first and that populates almost all the causes of pressure, temperature and level deviation.  So the pressure, temperature and level discussion are crisper and more efficient.


HAZOP+Book.png

LIKE WHAT YOU'RE READING...

If you would like to continue reading about GATE's method to conducting fun HAZOPs, you can obtain a copy of the book HAZOPS Should Be Fun: The Stream-Based HAZOP from Amazon. Now available in paperback.

All proceeds go towards the GATE Scholarship fund for future engineers.

HAZOPs Should Be Fun: The Stream-Based HAZOP

$15.00

By Howard Duhon


Would you rather a free eBook copy of our “HAZOPs Should Be Fun”? Click the button, fill out the form and you will be redirected to the eBook download.


Previous
Previous

Ebook: Making Sense & Making Decisions

Next
Next

Failures Related To API 5ct High Strength Steels