In the example above, although the alarm did not sound, auto fail safe valves did close, but not before 200 to 5000 kg of ethylene had been released, subsequently causing $ 21.8 million damage to the plant.

• 在上例中，尽管警铃没响，事故自动安全阀却关闭了，不过这只可能在200到5,000kg乙烯已经泄漏出来以后，因此而引起了该厂2180万美元的损失。