At the Unloading Area, we can receive raw material or product via truck, rail car, or ship. By strategically locating valves, (which can be operated remotely by an operator in a control room or with the addition of electronic pig detectors and solenoids, explained in more detail later), product is sent to proper holding tanks for later use. As you can see, after product carrier (truck, rail car, or ship) is emptied, the PDP pig is run between the two Pigging Stations, pushing the product left in the line into the appropriate tank. You will also notice that the small amount in between the Pigging Tee and the first valve on the main line is pushed to a containment tank. This could be further recovered by small piping leading back to the appropriate tank. By utilizing the Process Pig System, the line is free of previous product for the next unloading process.