Here's one down to poor piping design, poor communication and penny pinching. The company standard was bellows on every nozzle, and were included in the design before a stress engineer was taken on. He modified the function of several to improve the design, but one required change was not communicated to the manufacturer by the company, and the stress engineer was laid off so unable to check the final design.

A bellows able to take 3mm lateral movement was thus installed where about 50mm was imposed. It survived about 3 months then ruptured, shutting down the local town.

http://www.hpa.org.uk/chemicals/reports/cir17_jul2000.pdf