DocumentCode :
2405267
Title :
Incorporating process demand into models for assessment of safety system performance
Author :
Bukowski, Julia V.
Author_Institution :
Dept. of Electr. & Comput. Eng., Villanova Univ., PA
fYear :
2006
fDate :
23-26 Jan. 2006
Firstpage :
577
Lastpage :
581
Abstract :
The paper presents a simple model of a safety instrumented system (SIS) that explicitly incorporates process demand in addition to including both the detected and undetected modes of the fail dangerous state, and shows the impact of process demand on SIS performance. The research concludes that the explicit incorporation of process demand is necessary to assess SIS safety performance appropriately, and that a simple arbitrary division between low demand and high demand is insufficient. The study also suggests a method of using the model to determine an appropriate value of TI, the time to periodic inspection and maintenance of the SIS, so as to achieve a suitable level of SIS safety performance. The paper notes the limitations of the present work, and provides suggestions for future research in this area
Keywords :
IEC standards; Markov processes; inspection; maintenance engineering; process control; safety systems; IEC 61508; Markov models; SIS inspection; SIS maintenance; SIS models; detected modes; fail dangerous state; process demand model; safety instrumented system; safety system performance; undetected modes; ANSI standards; IEC standards; Injuries; Inspection; Instruction sets; Instruments; Measurement standards; Process control; Safety; System performance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Reliability and Maintainability Symposium, 2006. RAMS '06. Annual
Conference_Location :
Newport Beach, CA
ISSN :
0149-144X
Print_ISBN :
1-4244-0007-4
Electronic_ISBN :
0149-144X
Type :
conf
DOI :
10.1109/RAMS.2006.1677435
Filename :
1677435
Link To Document :
بازگشت