自1991年第一版EEMUA 168出版以来，人们对压力测试技术的理解有了显著提高。无损检测技术的多样性和可靠性增加了，断裂力学的应用提供了更定量的方法。新修订的EEMUA 168第二版反映了这些发展以及压力容器标准的同步变化，尤其是在“验证应力”是主要关注点的情况下。

Since the First Edition of EEMUA 168 was published in 1991, there has been a significant rise in the understanding of the technology surrounding pressure testing. The variety and reliability of non-destructive testing techniques has increased and the application of fracture mechanics has provided a more quantitative approach. The new substantially revised Second Edition of EEMUA 168 reflects these developments and the concurrent changes to the standards for pressure vessels, particularly where 'proof stress' is of primary concern.