This equipment is designed after problems with Slick Line.
If they do the services work on the well, the safety valve and the master gate valve will be open with hydraulic pumps.
They connect small hydraulic pumps to the systems and open both valves.
Normally the valves stay in open position when there is enough pressure on the valves.
In this case there was a small leak in the pressure line to safety valve. The safety valve start slowly to close, the operator was not aware of this situation, and the safety valve damaged by pulling the slick line tools.
To avoid these problems in the future we designed a low pressure alarm system.
How the system works