I.S. EN Railway Applications - The Specification and. Demonstration of Reliability, Availability,. Maintainability and Safety. View Account▹ · Home; BS EN Secure PDF. ℹ Printed Edition + PDF; Immediate download; $; Add to Cart. considers RAMS, understood as reliability, availability, maintainability and safety and their interaction; - RAMS targets, quantities, requirements or solutions for specific railway applications; This part 1 of EN is applicable to railway application fields, namely Command.
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BS EN Railway Applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Secure PDF. ILNAS-EN Railway Applications - The. Specification and Demonstration of. Reliability, Availability, Maintainability and Safety. RAMS standards provide guidance what to do in order to increase the confidence that the system guarantees the achievement of this goal.
The following are recommendations to be followed in order to develop an appropriate and suitable breakdown structure for RAM purposes: Avoid the use of "large number of levels" and limit these to a reasonable number three or four are suggested , Last item identified along a branch must be a LRU Line Replaceable Unit , Force the use of the same terms and definitions for identical items, Ensure that the terms and definitions used for every item are the same in all the design documents drawings, outlines, diagrams, specifications, etc , After the first issue of the structure avoid continuous modifications, Avoid the use of vague or unclear definitions.
A minimum set of data is used to represent and to manage the breakdown structure. This kind of data is the baseline of the different analyses that should be carried out during the Life Cycle.
Every breakdown structure should be represented with a header containing at least the following: Table 2 Example of header for a form representing a breakdown structure Subject Details Rolling stock ID code or definition of rolling stock Doc. Part No.
Examples of Breakdown Structure are given in Annex A. The following general failure conditions are defined for the rolling stock based on general failure categories, which may be experienced by a generic railway transport: Immobilising failures, Minor failures. Minor Failure: Any failure occurring on the Rolling Stock, that is not classified as significant or major, leading to a maintenance task, even if this failure has no impact on service.
According to the above mentioned definitions and conditions of failures, the Customer should state: The number of minutes of delay for Significant Failures and Major Failures, The threshold cost for Significant Failures and Major Failures, The method for counting the delay i.
Tables 5 to 7 show the specifications for each Failure Category.
There are three barriers that prevent the hazard: A human based departure procedure, where the train driver looks out of the window and checks the doors before departure e. There are also two technical functions: - A traction blocking that prevents the train from driving if the door controllers indicate the doors are open f.
This function is part of the train computer and is expected to be reliable with a failure rate of 1 failure pr. As it can be seen we will end up having an accident where the train departs with a passenger trapped between doors every year. Can we accept this?
What are our quantitative acceptance criterion? It should be written and stated in the safety management system of the Operator.
The safety management now decides that the above result is unacceptable. We can only allow the hazard to occur every 10,'End year.
A deeper analysis shows that the failures on the detection function only occurs for thin objects like a small child's arm. These mitigating actions result in a dramatically lowering of the frequency of the hazard to app. As a side effect, the analysis proves the importance of the departure procedure and the detection function.This only starts new discussions instead.
Log In Sign Up. The standard is available on PDF file.
Get this blog as Download or Printed Copy Click above for rev. This function is part of the train computer and is expected to be reliable with a failure rate of 1 failure pr.
The fault trees easily swell up into large trees with several undocumented values based on engineering judgement. The safety management now decides that the above result is unacceptable.
Interpretation The quantitative risk analysis is the right way to estimate the frequency of a hazard.
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