Direct burial cable is similar to normal cable in appearance, how ever direct burial cable is clearly marked on its sheathing. Sheathing for direct burial cable is created with plastic and provides a coating that allows direct burial cable to be buried without the need for conduit. How ever if direct burial cable is run above ground, it must be protected by being installed in a conduit. A minimum depth of 24 inches is required when the cable is installed under streets, highways, roads, alleys, driveways or parking lots.
Direct contact membrane separator employs micro porous hydrophobic hollow fiber membrane modules to create large membrane areas in small volumes for air-water phase contact without intermixing. Since the micro pores in the hydrophobic walls of the hollow fibers are air-filled, gas permeation rates through this membrane are far higher than for any solid or liquid membrane.