In order to use a PVC liner system, care must be taken to ensure that the PVC is compatible with the liquid being contained. For storing liquid fertilizer in a steel walled tank, a PVC liner should fit the bill. However, cleaning the liner and filling the liquid fertilizer tank must be done in a way that will not puncture the liner. PVC is a strong material, but will puncture when subjected to sharp objects.
An added benefit to using PVC liners as secondary containment that is often overlooked is the potentially longer life span of the tank itself. Over time, a steel tank will degrade and lose strength along its welds due to exposure to the corrosive properties of the liquid being stored. Because the liner in effect acts as the primary containment, the stored liquid does not come into contact with the walls of the tank, thereby protecting it from possible corrosion and extending its life.
And finally, a PVC secondary containment liner is far easier to implement than it is to build a double walled tank or erect a lined dike. Most PVC liners can be installed in one day.
Given the significant cost savings of using a flexible PVC liner as a secondary containment system, coupled with the added benefits of longer tank life and reduced operational costs, a PVC tank liner is a system that is worth considering for your above ground storage tanks.