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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Juan Carlos Rodenas (info@einsa.es )
Organization:EINSA
Date posted: Wed Oct 18 3:44:11 US/Eastern 2000
Subject: reliability of non-electrical component
Message:
I am trying to obtain the NPRD95 data, but I am in the process of find internal funds. The problem is that I am trying to obtain a reliability number for an offer to spanish air force. I haven´t found any data about failure rates for the next components: - Electrohidraulic pressure switches. - Flowmeter - Electrovalves - Heat Exchanger (oil). Please any data that can be send will be appreciate. It is only a gross number, more detail number will be calculated when de design progress. Thank you in advance to all


Reply:

Subject: Failure Rates Non-Electrical Components
Reply Posted by: Ed Sherwin (esherwin@alionscience.com )
Organization: RAC
Date Posted: Thu Oct 19 14:35:27 US/Eastern 2000
Message:
Dear Mr. Rodenas In response to failure data for the four parts reference in the Forum, I tried to provide the most applicable failures rates for these parts based on the limited information I have. Electrohydralic Pressure Switch - this part description was not found in our data base, therefore I am suggesting you a failure rate of 37.8119 which is an average of all military presuure switch. Flow Meter - part in data base for GF only. Failure rate is 4.7745. Electrovalve - I an assuming this is a electric activated valve. Due to the other parts, I am assuming that hydraulic oil is the medium. Therefore, a military (AU) environment failure is 47.8589. Heat Exchanger (Oil) - Omly commercial application failure rate were available for oil heat exchagers. The failure rate is 0.7459 Please contact me if you have any questions.


Reply:

Subject: THANKS
Reply Posted by: JUAN CARLOS RODENAS (INFO@EINSA.ES )
Organization: EINSA
Date Posted: Fri Oct 20 3:27:47 US/Eastern 2000
Message:
Thank you very much for your reply. I think that your data will be very usuful for my purpose. As I explain it was only a gross number needed, and better calculation is intended to be done. I expect in that time I will have NPRD 95 and more data for our supplier. My only concern is that I forget to introduce the enviroment, but the envioroment is Gb (good enviroment) so I assume that this data are valid or at least conservative. Thank you again for your time and I expect we will have future contact in this forum or bu mail, and I expect that I can help you in the future ( I am working hard to obtain experience in this field) so I you need my help do not hesitate to contact with me. Best regards Juan Carlos Ródenas


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