Probability Classification To Use

This document provides a failure modes and effects analysis (FMEA) for a piece of equipment. It outlines the item's name and number, functions, potential failure modes and causes, effects of failures at both the item and system level, any compensating provisions, how failures could be detected, estimated failure probabilities, and criticality levels. The document also requests the analysis account for any single point failures or common mode failures, as well as failures that could injure personnel or severely damage the ship.

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Probability Classification To Use

Uploaded by

Ganeshrud

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Download as DOC, PDF, TXT or read online on Scribd

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Nomenclature Item Reference Number Item Function(s) Functional Failure(s)/ Failure *ode(s) -ause

Failure 0ffects -ompensating Provisions Failure /etection Failure Probability

-riticality ,evel

Name/ nomenclature for the equipment or component Part number for the equipment or component Identify the function(s) the item is designed to perform/provide (example Function ! Provide !"#$% &# '( po)er) Identify the probable failures associated )ith each function (example Failures !+! ,oss of !"#$% &#'( po)er !+" Po)er out of phase) Identify )hat could specifically cause the identified Failure(s) (example Failure -auses !+! .ransformer failed !+" /iode failure) For each Failure *ode% identify the local effect (i+e+ the effect at the item1s level) and the effect(s) at the next higher level For each Failure *ode% identify any design provisions% such as redundancy% operator actions% or other provisions that )ould mitigate/eliminate the effect of the failure+ Identify ho) the failure )ould be detected (example thermocouple% visual indicator% hidden failure% etc+) Identify the probability that the failure mode could occur )ithin the first 2 years of equipment operation+ 3se one of the follo)ing classifications Probability Classification to Use $ery ,o) (approximately #4) $, ,o) (less than !#4) , *edium (bet)een !#4 and * 5#4) 'igh (greater than 5#4) ' Identify the probable -riticality of the failure(s) as they relate to equipment function and/or personnel safety+ 3se the follo)ing classifications Criticality Classification to Use *inor or no effect on item1s I functional performance or on environment6 no in7ury to personnel /egradation of functional II performance Possible loss of item function6 III significant damage to equipment or environment6 ha(ard to personnel Possible loss of life6 loss of ship I$ or significant damage to environment

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9long )ith the reliability data% the :eller shall provide% as applicable

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9ny assumptions made in the analyses Identification of any >single point failures1 and/or common mode failures% if applicable% and :eller1s recommendations regarding them Identification of the failures/failure modes that could cause personnel in7ury or death% or severe damage to the ship

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