Here's another incident.

en.wikipedia.org/wiki/1998_Esso_Longford_gas_explosion

A hot oil system shut down, the natural gas brought the temperature of the heat exchanger down below its embrittlement temperature, and the thermal gradients induced when the hot oil restarted caused a brittle fracture of the exchanger. It released about 10 tons of natural gas, which ignited.

Moral to the story - consider upset conditions!