Chris Harding, Colin Deddis , BP, UK
Multiple layers of protection prevent hazardous conditions arising in process plant. The relief system is often the final safeguard. Every demand placed on a relief system indicates that other layers of protection have been compromised. A study by the Institute of Petroleum in 1998 and a recent review show that incidents affecting the integrity or capacity of the entire relief system continue to occur.
This paper discusses incidents resulting from blockage or restriction of the relief system, considers their root causes and offers suggestions to help recognise and avoid potential future incidents.
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