Forum: Reliability & Maintainability Questions and Answers
Posted by: Carlos Alberto Scapin (cscapin @ fdg.org.br )
Date posted: Sun Dec 12 5:55:32 US/Eastern 1999
Subject: Fail Rate For Valve
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 (firstname.lastname@example.org )
Date posted: Fri Dec 10 13:46:48 US/Eastern 1999
Subject: Minimum SiN passivation thickness
I have always used the 0.5 Ám 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 (email@example.com )
Date posted: Wed Dec 8 12:06:23 US/Eastern 1999
Subject: Battery Reliability
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
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 (firstname.lastname@example.org )
Date posted: Thu Nov 25 5:09:20 US/Eastern 1999
Subject: Rear Earth Magnets
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?