Storage tank is an important part of a chemical industry process because storage tanks not only provide storage for products and raw materials but also maintain the availability of products and raw materials and can safeguard products or raw materials from contaminants. One of the existing storage tanks in PT Badak NGL is the LNG Storage Tank. This system becomes very important because any failure that occurs will be very dangerous because LNG is a volatile fluid. That is the reason why in each tank is equipped with a multi-level protection system for every possible failure that occurs. A simulator can be used as a learning tool to learn protection logic designc for each failure in the LNG Storage Tank System. The design of this simulator adapts the original system of PT Badak NGL manual book with certain adjustment. The simulated variables are levels and pressures, with some supporting components as a representation of the original equipment in the system. Some sensors are used to support sequences that run on the simulator. Based on the simulator test results, for level and pressure variables. The bottom fill conditions on LSLL, LSH-01, LSH-02, LSHH for temperature <40 then heater 1 and 2 will light, SV-01 and SV-04 will open, and motor 1 will work. Top fill condition on LSLL, LSH-01, LSH-02, LSHH for temperature> 40 then heater 1 and 2 die, SV-01 and SV-04 will open, and motor 1 will work. The open PSH-01 valve pressure condition is SV-06, when the open PSH-02 valve is SV-06, and SV-07, when the open PSHH valve is SV-06, SV-07, and SV-08.