System, tool and method for cleaning a tank that stores oil products. In some embodiments, the seal caps according to the present invention are made of a material having a dielectric breakdown strength of greater than 1. A pseudo clock may be generated from the system clock in which some of the system clock pulses are disabled to achieve a pseudo clock with the desired effective frequency. In various embodiments the semiconductor device will not function until the pad portions are electrically coupled, and in other embodiments the functionality of the device may be selectively controlled by connecting selected pad portions from a plurality of pad portions. The CSI field includes a cyclic shift and an orthogonal cover code index. Both tubes are inflated, and ballast water is filled on the web, whereupon, when floodwater rises, the tube facing the flooded area floats in the floodwater and due to its buoyancy rises, thereby forming a flood barrier.