Which of the following is NOT a part of the procedure for shutting down a line?

In the context of shutting down a line, the procedure typically involves actions that safely and systematically isolate the line, ensure that the contents are managed properly, and reduce the pressure to avoid any hazards. Among the given options, "Pumping the line" is not a part of the shutdown process because this action entails actively moving fluid through the line rather than ceasing its operation.

When shutting down a line, the focus is on stopping the flow of fluid. Actions such as filling the tank may be associated with managing the contents of the system before it is completely shut down, while "Gate down" and "Throttle down" refer to the process of closing off valves to control or stop flow. Therefore, while filling a tank, gating down, and throttling down are all part of properly and safely shutting down a line, pumping the line contradicts that goal by keeping the system operational. Understanding these processes is essential for ensuring safety and efficiency during line shutdowns.