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The Incident

A fire was started in a common feed pipe.

The Investigation

The pipe was being used in a nitration process.  The line had been used to charge 98% sulphuric acid and was then switched to 96% nitric acid.  This formed a hypergolic mixture in the line which caused a fire.

Conclusions

Lessons Learnt

This is not the first incident of incompatible chemicals mixing in a common feed line.  Sadly, it probably won't be the last. Items such as this should not even get past the planning stages of a plant

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