Determinasi SIL Untuk Alarm
-
Upload
ismadina-isma -
Category
Documents
-
view
233 -
download
0
Transcript of Determinasi SIL Untuk Alarm
-
7/23/2019 Determinasi SIL Untuk Alarm
1/8
1. Determinasi SIL untuk alarm
A survey of the literature shows that signicant variation exists in the
recommended PFD to be used for the overall layer of protection (PFD Safety IP
Alarm!" As shown in #able $% &&'A $)$ provides recommended PFD Safety IPAlarm values as a function of *uasi alarm system performance re*uirements" It
recommends not using a PFD Safety IP Alarm below +"+$ for any operator
action" #he I&, -$.$$ / ISA 01 standard allows the use of PFD Safety IP Alarm
e*ual to +"$" 2$+3
-
7/23/2019 Determinasi SIL Untuk Alarm
2/8
,ontoh perhitungan PFD untu4 Safety Alarm
-
7/23/2019 Determinasi SIL Untuk Alarm
3/8
5esimpulan6
7perator response to alarms (safety IP alarms! can be used to reduce ris4 as
part of a layer of protection analysis" In order to accurately estimate their ris4
reduction credit% it is important to understand the design of the system% the
operator8s environment and the alarm management practices and proceduresthat will be used during operation" #his paper has shown that reliability of the
hardware (sensor% logic solver% 9'I% nal element! provides a lower limit for the
probability of failure on demand for a safety IP alarm" #he example calculations
yielded a hardware contribution of "+1. and "+:1 for ;P,S and SIation and / or its
performance has not been proven to be acceptable based on comparison to
metrics established in ISA
-
7/23/2019 Determinasi SIL Untuk Alarm
4/8
ntu4% 4olom maximum time to respond% sebagai beri4ut6
ntu4% prioritisasi ma4a dila4u4an penggabungan 4eduanya6
-
7/23/2019 Determinasi SIL Untuk Alarm
5/8
ada priority alarm 4eempat yaitu critical
Berdasar Buku larm "ana#ement $and%ook
&ualitati 'isk "atrintu4 Severity% 4riteria sebagai beri4ut6
S4or nilai% berdasar software yg berlandas4an &&'A dan petun?u4 bu4u6
-
7/23/2019 Determinasi SIL Untuk Alarm
6/8
B" larm ctivation Point
Data yang harus dicari6
-
7/23/2019 Determinasi SIL Untuk Alarm
7/8
Berdasar Buku 7 efective methods or optimum perormance(IS!) pen#hitun#an hi#h alarm trip point adalah se%a#ai %erikut*
-
7/23/2019 Determinasi SIL Untuk Alarm
8/8
1" Limit o larm Limit