3 replies to this topic

[ChemEng01]

Hey Guys

 

I'm attending a CHAZOP (Hazard and Operability Studies for Control Systems)

 

While I have been part of many HAZOPs, this is my first CHAZOP. 

 

Has anyone got any good information for CHAZOPs. (Especially typical guide words / deviations)  I am developing some guide words (or deviations) as you would for a HAZOP. Each deviation will be looked at for the control system and causes / consequences / safeguards / actions will be done as per a typical HAZOP. 

 

For the deviations I'm thinking along the lines of, for example

 

NO OR NOT OR LESS

No or Less Power

No or Less current / signal

Lost data

Data rate too slow

MORE

High volts / amps

High alarm rate

REVERSE

Transmit when should be recieving

etc etc.....

 

 

I'm just making them up at the moment. Does anyone have a list of typical CHAZOP deviations?

 

Normally for a HAZOP the deviations are pretty standard (i.e More / less flow, temp, pressure. Reverse or missdirected Flow, etc etc) and most companies or clients have a list of standard deviations. 

 

Any guidance much appreciated

 

Thanks

 

 

 

 

 

 

 

 

 

 

 

[Zauberberg]

See attached material, Section 4 in particular.

 

Try to obtain the book "Process Automation Handbook - A Guide to Theory and Practice" by Jonathan Love. There is a paragraph dedicated to CHAZOP. I think you can also find it on Google books.

Attached Files

•  (C)HAZOP for Computer-Controlled Plants.pdf   1.17MB   309 downloads

[Zauberberg]

Here it is - I have a soft copy with me. You can see some common guidelines used.

Attached Files

•  Pages from Process Automation Handbook.pdf   68.08KB   264 downloads

[ChemEng01]

Thats great!

 

Thanks a lot Zauberberg.