Keep a roll of duct tape and a permanent marker in the compartment nearest to the pump panel. When you have mutiple lines off the rig with members of different companies taking the lines, rip off a piece of duct tape, put it on the panel just under the valve control or gauge and mark the company's ID on it. That way, when a company calls for more pressure or to have a line shut down, you won't shut down the wrong one by mistake.
