The first scenario is maximize propylene production operateing at 800oc and pressure 2-3 abs. In this scenario will have more HVC product such as propylene, butadiene and will have less ethylene production. There are many important parameters that must be measured to operate steam cracker in good way. The parameters are coil, reactor and adiabatic volume inlet and outlet temperature, inlet and outlet pressure and residence time. All these parameters isare very important to improve heat transfer, raise severity, minimize coking and maximize olefin yields. The coil inlet temperature is 601oC and it outlet temperature is 805oC, also the coil inlet pressure is 3.4 atm and the coil outlet pressure is 2.79 atm that means the pressure drops around 0.69 atm and the coil residence time is 0.251 second