determinasi sil untuk alarm

7/23/2019 Determinasi SIL Untuk Alarm

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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


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,ontoh perhitungan PFD untu4 Safety Alarm


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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


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ntu4% 4olom maximum time to respond% sebagai beri4ut6

ntu4% prioritisasi ma4a dila4u4an penggabungan 4eduanya6


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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


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B" larm ctivation Point

Data yang harus dicari6


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Berdasar Buku 7 efective methods or optimum perormance(IS!) pen#hitun#an hi#h alarm trip point adalah se%a#ai %erikut*


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1" Limit o larm Limit

determinasi sil untuk alarm

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