Life Cycle Analysis Of Tunnel Equipment - Basis For Safe Operation
Index of Contents Introduction
Life Cycle Analysis Of Tunnel Equipment - Basis For Safe Operation
Basics Useful life period Life cycles of a...
Life Cycle Analysis Of Tunnel Equipment - Basis For Safe Operation
Basics Useful life period Life cycles of a few selected systems Summary & Recommendation
Road Tunnel Operations Management and Safety
Questions
Seminar Chongqing, 18 - 20 October 2006
Urs Welte Dipl. El.Ing. ETH Switzerland 2
Introduction
Life Cycle & Useful Life Period
Frequency
The importance of the technical equipment in tunnels (technical maintenance vs. total maintenance)
Early breakdowns
Existing tools for an optimal Asset Management
Life cycle
Age-related breakdowns
Useful life period
Exploration of the optimal useful life period Problem: The optimal useful life period of EM-Systems depends on the application area
Minimal acceptable value
Life cycle:
Time
max possible useful life period
Useful life period: time in which the system can be used reasonably Introduction
3
Basics
4
Impacts on Life Cycles
Impacts on Life Cycles
Maintenance
Refurbishment, Renovation due to external reasons
Aim: to improve the useful life period with a minimum of money & manpower, or minimize the risk of a break down Reasons for a total renovation Notes
Different maintenance strategies: High reliability, small error probability Longest possible useful life period
Pavement, sealing,…
New safety / environment requirements
Ventilation, escape route
Most of the equipment has reached its end of the life cycle
Ideal conservation of value
Basics
Structural renovation of the tunnel
5
Conclusions
Basics
6
Useful Life Period in Practice
In a systems life cycle, the replacement is influenced by: Life cycle curve of the system Total tunnel refurbishment New requirements Superior reasons (lack of maintenance,…)
Diagnostic for the verification of the early aging
Life Cycles of a Few Selected Systems
39
Life Cycles of a Few Selected Systems
40
Static Stress
Preventive Measures for Long Life Cycles No variations in temperature (cable conduit) No humidity (cable conduit) Good mechanical support Bending rules
Reduction in stress & protection from environmental effects Æ
Life Cycles of a Few Selected Systems
41
longer life cycle
Life Cycles of a Few Selected Systems
42
Summary & Recommendations Extrinsic factors have a high influence on a systems life cycle Empirical evaluation and observation necessary ?
Analysis and diagnostics on a case-to-case basis