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SIS [Safety Instrumented System]

Value No.1 Complex

7/21/2019 SIS

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2

SIS

• Revamp Flare Load

! "# $ % &'( )* + , -. / 0 ( 1 2 34

.• : Column PSHH Heat Source (Rebo ler! 56 Lo" c 78

– #S$ (#mer"ency S%ut&do'n! 9:

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1. SIS ;

• ; =>) (Risk) ? %@A BCD "E F'( G H I => JK .LM

OH )P Q -. ,R .

• ; S TU VWM =>8 OH @A $ % X BYD Z[S \7] .

• \ 78 \^

• Sensors (Transmitter, Switch, …)

• Logic Solvers (DCS, PLC, ... )

• inal !lements (Control "alve, !mergenc# Sh$t%own "alve, …)

&. SIS )* <• ` a /; ('$t o Control Process) =>)( b -. ( *$man Sa et#), :d

( Im+act on !nvironment) _B S1 2eD fbgD hiK Hd e jk .

. Sa et# Integrit# Level (SIL)

Safety Inte"r ty Level (SIL! Probab l ty of Fa lure on $emand(PF$!

SIL ) & * ) &+

SIL+ ) &+ * ) &,

SIL, ) &, * ) &-

SIL- ) &- * ) &