Sharing practice: OEM prescribed maintenance. Peter Kohler / Andy Webb
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1 Sharing practice: OEM prescribed maintenance Peter Kohler / Andy Webb
2 Overview 1. OEM introduction 2. OEM maintenance: pros and cons 3. OEM maintenance: key message 4. Tools to help 5. Example 6. Takeaway thoughts 7. Summary 2
3 What is an OEM? Types of Original Equipment Manufacturer Prime system Commercial off the shelf Component All have responsibilities under Work Health and Safety legislation and the Rail Safety National Law 3
4 OEM maintenance: pros & cons Pros Provides a quick basis for building a maintenance plan Supports basic reliability performance Cons Unlikely l to bl balance cost, risk, ik performance May not consider failure consequence: may not address safety Maynotconsider the asset s s environment Not necessarily efficient for the user 4
5 OEM maintenance: key message Good basis but... Continual improvement drives you to review initial maintenance plan You need to understand failure consequence on your railway to ensure safety Source: Asset Management concept model, Asset Management Council 5
6 Moving forward Tools already exist to help us FMECA: a systematic way of assessing failure modes and their consequences enables the build up of effective maintenance tasks to address known failure modes IEC 60812: Application guide Failure mode effects analysis 6
7 FMECA process overview Define the asset Break down into its key parts Identify how each part might fail Identify the failure effects and failure probabilities Risk assessment Identify and assess failure consequences Identify maintenance tasks Simplified diagram: refer to Sharing practice paper for more detail of the FMECA process 7
8 Sample FMECA track circuit Rail IRJ Housing Train detector Power supply Define the asset being analysed, including its boundaries Track feed Power supply Housing Signalling system As an example, consider the tail cables connecting the rails to the train detection equipment Signalling system 8
9 Develop a FMECA (simplified example) Scenario 1: Consider the track circuit tail cable on low use sidings Function Sample failure mode Sample failure effect Failure Rate Sample consequence Criticality Sample maintenance tasks Fails to connect electrically (eg open circuit) Track circuit shows occupied when clear Minor delay to traffic Manual operation mode Analyse causes, leading to a task frequency for: Examine cable connections Examine cable for damage Ensure cable securely fastened To connect the rails electrically to the train detector (track relay) Fails to isolate electrical circuit Track circuit shows occupied when clear Track circuit shows clear when occupied Very low Minor delay to traffic Manual operation mode Slow speed collision Medium Analyse causes, leading to a task frequency for: Examine cables for damage Insulation test cables Analyse causes, leading to a task frequency for: Examine cables for damage Insulation test cables 9
10 Develop a FMECA (simplified example) Scenario 2: Consider the track circuit tail cable on a high use passenger main line Function Sample failure mode Sample failure effect Failure Rate Sample consequence Criticality Sample maintenance tasks Fails to transfer electrical energy (eg open circuit) Track circuit shows occupied when clear Medium Minor Delay to traffic Manual operation mode Medium Analyse causes, leading to an increased task freq for: Examine cable connections Examine cable for damage Ensure cable securely fastened To transfer electrical energy from the rails to the train detector (track relay) Fails to isolate electrical circuit Track circuit shows occupied when clear Track circuit shows clear when occupied Medium Very Minor Delay to traffic Manual operation mode Slow speed collision Passenger train collision, potential fatalities Medium Medium Very High Analyse causes, leading to an increased frequency for: Examine cables for damage Insulation test cables Analyse causes, leading to anincreasedfrequency for: Examine cables for damage Insulation test cables 10
11 Takeaways Do you understand how your assets fail? Do you understand the consequence of failure modes? Can you improve your knowledge of how assets fail? Are there systems for recording defects and failures? Do you know your critical assets? Will you try a FMECA on your critical assets? How can today assist you in maintenance planning? 11
12 Summary OEM may provide a good initial base for planning maintenance but... Safe assets need you to: Understand how they fail on your railway Understand failure consequences on your railway Plan maintenance activities to mitigate against asset failure 12
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