Appendix 5

An Illustration of HAZOP Study for a Procedure


A detailed description of all the stages of a HAZOP study of a procedure, namely, a one-off removal and replacement of a section of a hydrocarbon pipeline. The preparation and sequence are described as well as the selection of nodes with their design intentions. The selection of guidewords and their application to two of the nodes are shown along with the HAZOP reports and a list of the key findings.


Procedure HAZOP; node selection; design intention; HAZOP report.

This study is loosely modeled on an article in the ICI Safety Newsletter No 32 August 1971. As the study is “hypothetical,” the working parameters of the up- and downstream processes are not available but this ...

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