| Summary: | 碩士 === 國立交通大學 === 工學院產業安全與防災學程 === 101 === FMECA, Failure Modes , Effects and Criticality Analysis, is a method of risk analysis with a type of anticipating reaction. Through examining and analyzing function and requirement of every system component, FMECA detects and examines potential failure modes and possible influence results progressively, which caused by the system, procedure, apparatus, message or human behavior.
This study adopted FMECA method to analyze various failure modes of standpipe and hose system and selected key factors of failure modes in the system. Furthermore, this study utilized Surge, hydraulic calculation software, to simulate and evaluate standpipe and hose system with turbulent state, and quantify the possible result of failure modes in order to conduct some appropriate precaution measures.
The above-mentioned risk analysis shows that failure modes of higher risk in the standpipe and hose system as follows:
1.Startup sequence error of fire fighter's operation related relaying pump,
2.Hosepipe rupture between fire vehicle and water inlet of fire department connection,
3.Stop valve closed in water inlet of fire department connection,
4.Controller block in pressure reducing valve due to impurities or corrosion of the pipe itself,
5.Disturbing flow influences pressure control in pressure reducing valve,
6.Relaying pump suck air,
7.Impurity in the standpipe,
8.Nozzles turn on and off by fire fighters.
According to assessment analysis results, while pressure reducing valve was unable to open in the lower floors, it produced the pressure drop around 26 kgf/cm2 at the secondary side of pumps in lower floors, the pressure concussion may cause great destruction to the pipeline. While pumps failed in the lower floors, pump outlet sides produced pressure concussion about 2~12 kgf/cm2. Compared with scenario 6 (pump failures in higher floors), the pumps in the lower floors produced more destructive than pumps the higher floors.
Finally, this study proposed better strategies of Standpipe and Hose System design, operation, and maintenance management for designer, examiner, local fire department authority, and building administrator. Also, it is hopeful to promote reliability of standpipe and hose system in building, increase utilization rate of fire rescue.
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