Forum: Reliability & Maintainability Questions and Answers
Posted by: Carlos Alberto Scapin (cscapin @ fdg.org.br ) Organization:SCAPIN CONSULTING Date posted: Sun Dec 12 5:55:32 US/Eastern 1999 Subject: Fail Rate For Valve Message: Iam presently in charge to make a preventive maintenance planning for one Through Conduit Valve, its weight is 22000 kilos , hydraulic operate,water refrigerate and working in a temperature of 950 celcius degree .Its function is to cut the flow of following chemical elements; C O and hydrogen ,every time that unsafe condition appeared.I need any information of failure rate of this type of valve,which will be install in the next month.
Posted by: Hei-Ruey Harry Jen (jenh@tycoelectronics.com ) Organization:M/A-Com Date posted: Fri Dec 10 13:46:48 US/Eastern 1999 Subject: Minimum SiN passivation thickness Message: I have always used the 0.5 µm thick SiN as the guideline for chip passivation. Is there any publication actually prove that is the minimum thickness for a moisture barrier? Please give me the source if you know. Thanks.
Posted by: John Sine (jsine@harris.com ) Date posted: Wed Dec 8 12:06:23 US/Eastern 1999 Subject: Battery Reliability Message: I am trying to find information on how to calculate the failure rate for batteries (re-chargeable and non-rechargeable) so that I can include them in a system Reliablity & Availability Analysis. Can anyone supply me with the equations and/or the source (refence material) for determining battery failure rates? Thanks for your help.
Posted by: Laurent Purrey Date posted: Fri Nov 26 1:14:45 US/Eastern 1999 Subject: MTBMA Message: Who can tell me how we can calculate the MTBMA (Mean Time Between Action)for a system. What is its value when the components or system is "ON CONDITION". NOTE: as assumption, MTBF, MTBUR are available.
Posted by: Peter Kirchhofer (peter.kirchhofer@jaquet.com ) Organization:JAQUET Ltd Date posted: Thu Nov 25 5:09:20 US/Eastern 1999 Subject: Rear Earth Magnets Message: Datasheets specify the Curie temperature and the much lower maximum allowable ambient temperature for the different magnet materials. Q1: What happens to the magnet during prolonged temperature cycling between normal and above maximum allowable temperature? Q2: Has vibrational stress any influence on the magnetic properties?
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