3.2 SIL Analysis
In sulphur furnace node, there is SIS that has a function as protection system of fuel system. Fuel system is used in start-up furnace for increasing the temperature of the furnace using combustion with gas fuel. The component in SIS fuel system furnace consists of pressure switch (PS-012) as sensor, relay as logic solver, and valve as the final element. The calculation of PFD is shown below in the Table 6.