ep-5-pms-failure analysis (mekeni food corp).ep
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8/10/2019 EP-5-PMS-Failure Analysis (Mekeni Food Corp).EP
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Color SurfaceShape CorrosionDimensions Photograph
Fracture Type Pits
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Spot tests OdorSp. gr. tests Vise
Hammer Magnet
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Problem statement Analysis ProcedureConclusions Economic impactRemedy
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Motor System
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A
PRIMARYMOTORFAILURE(OVERHEATED)(1)
EXCESSIVE
CURRENT TOMOTOR
B
EXCESSIVECURRENT IN
CUIRCUIT
FUSE FAILSTO OPEN
C
PRIMARYWIRINGFAILURE(SHORTED)(3)
PRIMARYPOWERSUPPLYFAILURE(SURGE)
(4)
PRIMARYFUSEFAILURE(CLOSED)(2)
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The analysis starts with theevaluation of the first gate, gate Aand proceeds downward. This
procedure is based in thesuccessive elimination of causes toobtain the minimum cut set.
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1. The first gate A is putin the top left-handcorner.
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2. A is an OR gate and isreplaced by its inputsvertically.
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3. B is an AND gate andis replaced by its inputshorizontally.
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4. C is an OR gate and isreplaced by its inputsvertically.
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This means that overheating of the motor can be causedby either of the following events:
Primary motor failure (1),Primary power supply failure (4) and primary fusefailure (2),Primary wiring failure (3) and primary fuse failure (2).
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Diagram of Compressed Air System
PC
NON-RETURNVALVE
PRESSURERELIEF VALVE
PRESSUREREDUCING VALVE
INSTRUMENTAIR SYSTEM
AIR RECEIVER
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RECEIVEREXPLODES
AIR FLOW INTO RECEIVEREXCEEDS FLOW OUT ATPRESSURE DANGER LEVEL
PRESSURE RELIEF VALVE FAILSTO GIVE ADEQUATE DISCHARGEAT PRESSURE DANGER LEVEL
PRESSURE REDUCINGVALVE FLOW LESSTHAN COMPRESSIONFLOW
PRESSURE CONTROLLOOP CAUSESCOMPRESSOR TO RUN
IN – CORRECTDESIGN
OTHERCAUSESDIRT
G H I
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PRESSURE REDUCINGVALVE FLOW LESSTHAN COMPRESSIONFLOW
IN – CORRECTDESIGN
INSTRUMENTAIR SYSTEMPRESSURE
ABNORMALLYHIGH
SEE SUBTREE
A
B
PRESSURE CONTROLLOOP CAUSESCOMPRESSOR TO RUN
INSTRUMENT AIRSYSTEM PRESSUREABNORMALLY LOW
OTHERCAUSES
B * F
AIR FLOW OUT
OF AIR SYSTEM(DEMAND +LEAKAGE)ABNORMAL ANDEXCEEDSPRESSUREREDUCING VALVECAPACITY
AIR FLOW OUT OF AIRSYSTEM NORMAL BUTFLOW IN ABNORMALLY LOW
SEE SUBTREEE
SUBTREE
PRESSURE REDUCING VALVEPARTIALLY OR COMPLETELYSEIZED SHUT OR BLOCKED
DIRTOTHERCAUSES
C D