在艾伦·R·贝伦斯（Alan R.Berens）关于“预测有机物通过PVC管的渗透”（AWWA杂志，1985年11月）的文章中，Crum和Carns指出，东湾市政公用事业区的现场经验证实了贝伦斯的结论，即PVC管是一种有效的化学污染物屏障，但他们指出，需要更多的工作来验证这一结论，方法是使用实际的PVC管段和垫圈材料，暴露在0.25到1.0范围内的有机化学品中，而菲茨基运输假设不再适用。

In this discussion of Alan R. Berens' article on "Prediction of Organic Permeation Through PVC Pipe" (Journal AWWA, November 1985), Crum and Carns state that field experience at East Bay Municipal Utility District confirms Berens' conclusion that PVC pipe is an effective barrier against chemical pollutants, but they point out that more work is needed to verify this conclusion by using actual PVC pipe sections and gasket materials exposed to organic chemicals with activities in the range of 0.25 to 1.0 where Fickian transport assumptions no longer apply.