SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Posted by: Juan Carlos Rodenas
Date posted: Wed Oct 18 3:44:11 US/Eastern 2000
Subject: reliability of non-electrical component
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.
- 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
Subject: Failure Rates Non-Electrical Components
Reply Posted by: Ed Sherwin
Date Posted: Thu Oct 19 14:35:27 US/Eastern 2000
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 Posted by: JUAN CARLOS RODENAS
Date Posted: Fri Oct 20 3:27:47 US/Eastern 2000
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.
Juan Carlos Ródenas