In our seminars, we speak about the pressure limitations on fill lines when loading tankers. Absent a label on the rig, we normally offer 100 psi as the pressure limit at the tank fill inlet. This is in line with most of the poly-tank builders today and we commonly see that pressure limitation number posted on the newer rigs.

The purpose then of this photo is for the folks physically connecting fill lines to the tankers. Not every tanker you see at the fill site is going to have a label. If no label, then assume 100 psi max. But, if your are making a connection and you find a label with anything less than 100 psi, then it is VERY important to let the pump operator know about the lower pressure requirement so that pump discharge pressure can be adjusted down some or a closer eye is kept on the loading rate..