Upload
jupni-mulyana
View
218
Download
1
Embed Size (px)
Citation preview
7/26/2019 Layers of Protection Angela Summers
1/17
1
Layers of Protection Analysis
ANGELA E. SUMMERS, PH.D., P.E.
SIS-TECH Solutions, LLC
Were Proven-in-Use.
7/26/2019 Layers of Protection Angela Summers
2/17
2
Defining risk tolerance
Risk Matrix
Risk Grap!uantitati"#
-
-
-
-
a
1
12
1
3
a
1
1
2
13
1
2
1
3
24
3
5
h8
-
-
a
1
W1W2W3
2
2
4
3
5
2
4
3
5
3
6
4
7
3
6
36
47
C1
C2
C3
C4
P1
P2
P1
P2
F1
F2
F1
F2
P$Da"%& $t'$np& Tol#ra(l# $r#)u#n*+
Pro*#ss D#an $r#)u#n*+
RISK REDUCTION FACTOR REQUIRED MATRIX
4 10 10 1000 1000 TH
3 NR 10 100 1000 1000
2 NR NR 10 100 100
1 NR NR NR 10 10
1 2 3 4 5CONSEQUENCE
FREQUENCY
7/26/2019 Layers of Protection Angela Summers
3/17
3
Independent Protection Layer (IPL) Analysis Objective
Dri"# t# *ons#)u#n*#an'or r#)u#n*+ o
pot#ntial in*i#nts to antol#ra(l# risk l#"#l
Intolerable Risk
Tolerable Risk
Risk & r#)u#n*+ / *ons#)u#n*#
7/26/2019 Layers of Protection Angela Summers
4/17
4
Initiating Cause
Pro*#ss D#"iation
Initiatin% *aus#sE)uip#nt ailur#s
0 instru#ntation
0pups
0*opr#ssors
uan #rrorsloss o #*ani*al int#%rit+
Initiatin% *aus# r#)u#n*+
7/26/2019 Layers of Protection Angela Summers
5/17
5
Consequence
1as# on #tail# #s*ription o a2ars*#nario.
Exain# sa#t+, #n"iron#ntal, an#*onoi* risks.
3t#n *onsi#rs t# possi(ilit+ o#s*apin% t# in*i#nt an t# r#)u#n*+
o #xposur# to t# pot#ntial in*i#nt.Ass#ss#nt a+ (# )ualitati"# or)uantitati"# 4*ons#)u#n*# o#lin%5
7/26/2019 Layers of Protection Angela Summers
6/17
6
n!itigated "isk
Incident Frequency = Initiating Cause Frequency
Consequence = Scenario Consequence
Initiating
Cause
Consequence
Unmitigated Risk
IS IT TOLERABLE?
7/26/2019 Layers of Protection Angela Summers
7/17 7
"isk #olerance
Copar# uniti%at# risk to risktol#ran*#.
I uniti%at# risk is %r#at#r tanrisk tol#ran*#, in#p#n#ntprot#*tion la+#rs ar# r#)uir#.
7/26/2019 Layers of Protection Angela Summers
8/17 8
$%at are IPLs&
Independent
Protection Laers are
o!ten depicted as anonion skin"
#ac$ laer is
independent in ter%s
o! operation"T$e !ailure o! one
laer does not a!!ect
t$e ne&t"
Basic Process Control SystemsNon-safety Process alarms
Operator Supervision
PR!N"ION
Safety Critical Process #larms
Safety Instrumented Systems
$I"I%#"ION
$ec&anical $itigation Systems
Fire and %as Systems
P'#N" $R%NC( RSPONS
CO$$)NI"( $R%NC( RSPONS
Process *esign
7/26/2019 Layers of Protection Angela Summers
9/17 '
Independent Protection Layer "estrictions
Su6*i#ntl+ in#p#n#nt so tat t# ailur#o on# IPL o#s not a"#rs#l+ a7#*t t#
pro(a(ilit+ o ailur# o anot#r IPLD#si%n# to pr#"#nt t# a2arous #"#nt,or iti%at# t# *ons#)u#n*#s o t# #"#nt
D#si%n# to p#ror its sa#t+ un*tion
urin% noral, a(noral, an #si%n (asis*onitions
Auita(l# or p#roran*#
7/26/2019 Layers of Protection Angela Summers
10/17
()
IPL
IPLs *an pro"i#Pr#"#ntion 4a*ti"# 8 lo9#r pro(a(ilit+5
0 Alar 9it op#rator r#spons#0 Sa#t+ Instru#nt# S+st#
Miti%ation 4a*ti"# 8 lo9#r pro(a(ilit+'*ons#)u#n*#5
0 Pr#ssur# r#li# "al"#
Prot#*tion 4passi"# 8 lo9#r *ons#)u#n*#50 Dik#s
0 M#*ani*al #si%n
0 1arri*a#s
7/26/2019 Layers of Protection Angela Summers
11/17
((
'itigated "isk "educe requency Only
IPL(
P*+(
IPL2
P*+2
,e-
T$ickness o! arro. represents !requenc o!
t$e consequence i! later IPLs are not
success!ul
I%pact
#/ent
!requenc
Mitigated Risk
red!"ed #re$!en"% & same
"onse$!en"e
IPL3
P*+3
Unmitigated Risk
#re$!en"% & "onse$!en"e
7/26/2019 Layers of Protection Angela Summers
12/17
(2
IPL( IPL2 IPL3
0cenarioConsequence
Initiating #/ent
*ailure
*ailure
*ailure
0uccess
0uccess
0uccess
0a!e 1utco%e
0a!e 1utco%e
0a!e 1utco%e
Consequences
e&ceeding criteria
,e-
T$ickness o! arro. represents !requenc o!
t$e consequence i! later IPLs are not
success!ul
I%pact
#/ent
!requenc
Pre/enti/e
*eature
Pre/enti/e
*eature
Pre/enti/e
*eature
Unmitigated
Risk
RE'U(E
)RE*UE+(,TO A(IEE
TOLERABLE
RIS/
Mitigated Risk red!"ed
#re$!en"% & same "onse$!en"e
7/26/2019 Layers of Protection Angela Summers
13/17
P)'0.1 P)'0.01 P*+)"(
0cenario
Consequence
Initiating #/ent
*requenc (r
*ailure )"(
*ailure )")(
*ailure )"(
0uccess )"'
0uccess )"''
0uccess)"'
*requenc )"'r
0a!e 1utco%e
*requenc )")''r
0a!e 1utco%e
*requenc )")))'r
0a!e 1utco%e
*requenc )")))(r
Consequencese&ceeding criteria
,e-
T$ickness o! arro. represents !requenc o!
t$e consequence i! later IPLs are not
success!ul
I%pact
#/ent
!requenc
Pre/enti/e
*eature
Pre/enti/e
*eature
Pre/enti/e
*eature
Unmitigated
Risk
Mitigated Risk red!"ed
#re$!en"% & same "onse$!en"e
7/26/2019 Layers of Protection Angela Summers
14/17
(4
'itigated "isk "educe requency and Consequence
IPL(
P*+(
,e-
T$ickness o! arro. represents !requenc o!
t$e consequence i! later IPLs are not
success!ul
I%pact
#/ent
!requenc
Unmitigated Risk
#re$!en"% & "onse$!en"e
IPL2
P*+2
Mitigated Risk
red!"ed #re$!en"% & same
"onse$!en"e
C0(
P*+
Mitigated Risk red!"ed #re$!en"% &
red!"ed "onse$!en"e
7/26/2019 Layers of Protection Angela Summers
15/17
P)'0.1 P)'0.1 P)'0.01
+i!!erent 0cenario
Consequence 1ccurs
,e-
T$ickness o! arro. represents !requenc o!
t$e consequence i! later IPLs are not
success!ul
I%pact
#/ent!requenc
Unmitigated
Risk
Initiating #/ent*requenc (r
*ailure )"(
*ailure )"(
*ailure )")(
0uccess )"'
0uccess )"'
0uccess )"''
*requenc )"'r
0a!e 1utco%e
*requenc )")'r
0a!e 1utco%e
*requenc )"))''r
itigated Release
tolerable outco%e
*requenc )")))(r
Consequences
e&ceeding criteria
itigati/e
*eature
Pre/enti/e
*eature
Pre/enti/e
*eature
Mitigated Risk red!"ed
#re$!en"% & red!"ed "onse$!en"e
7/26/2019 Layers of Protection Angela Summers
16/17
(6
SIL
One *IL Assign!ent #ec%nique
7/26/2019 Layers of Protection Angela Summers
17/17
(7
*u!!ary
2A man is ri"3 in 4ro4ortion to t3e n!m5er
o# t3ings 3e "an a##ord to 6et a6one.7
enr% 'avid T3orea!
Industr .ill be udged on $o. it balances t$e
preser/ation o! li!e and t$e en/iron%ent .it$ t$e
need !or re/enue and pro!its"
+ngineers are c%arged ,it%
ac%ieving t%e balance-