4. Conclusion
From the HAZOP Analysis there are some conclusions that can be obtained. Such as, after the hazard identification has been done, it can be seen that the component with the highest risk is on the sulphur furnace node. Based on the AS/NZS 4360:2004 Standard, the high temperature and low temperature deviation reached the extreme level. Furthermore, based on factory standard in PT. Petrokimia Gresik, the high temperature and low temperature
also reached the extreme level. So from both standards it can be concluded that it reached the highest risk level. Meanwhile, from SIL calculation in sulphur furnace node, it obtained the 1st level of SIL, with PFD value of 0.021 and RRF value of 48.3. In waste heat boiler node, it has the 1st level of SIL in SIS with PFD value of 0.018, and RRF value of 54.3. So, the risk of each component that is on the 1st level of SIL has been considered safe.