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Recent content by ramseng

  1. ramseng

    Provision Spares with Confidence

    Jardine and Tsang, chapter 2.11 provides the model I think you are looking for: Expected number of spares in interval=number of preventative replacements in interval+number of corrective replacements in interval= EN(0,t)=T/t+H(t)(T/t) Where H(t) is the number of failures expected in the...
  2. ramseng

    RAM without S?

    Pretty much agree with IRstuff - as a RAM engineer in this context I'd expect you to be more focussed on reliability modelling, prediction, maintainability analysis, perhaps logistic support development and so on with a safety engineer involved at a different stage; doing HAZOP, writing the...
  3. ramseng

    Maintenance engineering, how to star in a big company

    Some questions: Do you have the support of management to implement RCM? If you don't have the experience in the equipment, you will need to form working groups of subject matter experts to conduct the FMECA then task analysis. Do you have support to engage other departments and use their time...
  4. ramseng

    RAM without S?

    Impossible to know without knowing your specific industry culture. Some examples: Commercial industry here in Aus calls people who do RCA, RCM, FMECA, spares, LCC, reliability engineers. Defence calls these people ILS/logistics engineers. Commercial industry calls people who do condition...
  5. ramseng

    HYDRAULIC MAINTENANCE

    The number one rule is cleanliness is godliness in hydraulic systems. As mentioned above, provided the fluid is clean the system does not require much additional maintenance. The OEM should have provided the required oil cleanliness class for the system. Some thoughts for a checklist...
  6. ramseng

    Reliability Predictions

    Cheers EmmanuelTop I am aware of this - I'm not actually analysing trucks, they are just an analogy. I'm pretty happy to assume a constant failure rate for the equipment I'm looking at. IRStuff, thanks very much for taking the time to respond. Ah, I didn't make this clear - I've estimated λ...
  7. ramseng

    Reliability Predictions

    I had a look for a reliability forum but couldn't find it.. I'm not sure I have an aggregrate failure rate - what I have is an estimated failure rate from some sample data which applies to starter motors in general. Or, I could be in the same situation by using a manufacturer's quoted MTBF...
  8. ramseng

    Reliability Predictions

    I have an easy question which I should know the answer for but can't find the right terms to search for: I'm conducting a reliability analysis on some equipment. I have some data and have used a chi-squared method to calculate a failure rate, lambda, and then reliability with...
  9. ramseng

    Water vapour migration through stainless steel

    Thanks very much for the replies.
  10. ramseng

    Water vapour migration through stainless steel

    Hello all, I read a line a technical manual recently which stated that water vapour can migrate through stainless steel piping. The context is a high pressure (300 bar), very dry (dew point is <-50 deg C), air system. It stated that it is possible for water vapour to migrate through the pipe...
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