2.2 Data collecting
The data needed in this research are historical data related to the process done in the sulphur furnace of PT Petrokimia Gresik. The data are in the form of flow chart diagram, Piping and Instrumentation Diagram (P&ID), and data maintenance of tools from each component that are related to the process done in sulphur furnace. The data are used for identifying the hazard potential and measure the rate of SIL.