Created on December 6, 2016

It has been so long time after the last time I published Safety Buzz in this social media. In this occasion, I would like to share you regarding the finding of the UK HSE on accident caused by design-phase in the project life-cycle.

Majority of accident were due to incorrect and incomplete specification as the following the UK HSE finding shown in the picture. Specifications consist of both functional specifications (i.e. what system should do) and the integrity specification (i.e. how well it should do it).

End user in process industry faced dilemma, how to do an effective evaluation of so many diverse products. There are many vendors competing for making businesses in every market which likely suitable for their products – not necessarily best application of their products.

Needless to say, only the system user can develop system specifications.

No vendor can tell a user how best to operate their facility, or what sort of system would be most appropriate and safe.


Gruhn, Paul, Safety Instrumented System (SIS): Design, Analysis, and Justification, International Society of Automation (ISA), 2006.

Ir. Dedi Irawani, SFS
Process Safety Engineer

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