One key consideration in choosing a secondary seal is to understand how the profile of that secondary seal will impact your ability to operate the floating roof at the highest extent possible, in order to optimize your working capacity. For applications where the physical constraints at the top of the tank shell are the governing factor which limits the vertical travel of the IFR, you should consider utilizing a low-profile secondary seal in lieu of a standard height secondary seal. The inches saved can result in significant increases to working capacity. In addition, for applications requiring foam dams, reducing the height of the secondary seal will result in a more economical foam dam.