The Application of Fault Tree Analysis for Assessing the Risk in Safety Instrumented System of Steam Boiler
Keywords:
Safety instrumented system in steam boiler, Safety integrity level (SIL), Fault tree analysis (FTA), Probability of failure on demand (PFD)Abstract
Many boilers are at high risk of fire and explosion due to the nature of work and it takes mistake to cause a safety instrumented system failure. This study was to apply the fault tree analysis (FTA) for assessing the risk in safety instrumented system and to calculate the average probability of failure on demand (PFD) for classifying the safety integrity level (SIL) of steam boiler controller at a university hospital.The FTA was applied to identify the failure of safety instrumented system for assessing the risk. The average PFD was then calculated for classifying the SIL of steam boiler. The study was conducted from April to August 2023 at a university hospital in Thailand. Data collection used FTA. The FTA was consisted of feed water pump, level indicator transmitter 1, and level indicator transmitter 2. The three loop control systems had the highest probability of failure on demand. All three loop control systems showed the average probability of failure on demand as 8.5x10-1 and safety integrity level for level 1 (SIL1). Eventually, efforts should be made to supervise those risks by setting up the suitable preventive maintenance plan to reduce undesirable conditions from the safety instrumented system failure.
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