Stand by redundancy system reliability estimation

[FVicente]

Dear colleagues,

I am trying to calculate the reliability of the system with two pumps, one is active and the other is in stand-by mode. The problem that i have is the system follows the weibull distribution, so i cant appliy the equation for a constant failure rate that appear in all reliability handbook.Unfortunately i havent found the equation solved for a Weibull distribution.

Someone has solved this equation?or if you have found in a book,please i need this mathematical formulation. I am attaching the equation that i have to solve

Best regards for all
http://co103w.col103.mail.live.com/att/GetAttachment.aspx?tnail=4&messageId=4234ed3e-e368-11de-a42f-00237de4a69c&Aux=44%7C0%7C8CC458C283CAB80%7C%7C

[FVicente]

Dear colleagues,

Here i am attaching the equation for a stand by redundancy for a weibull distribution that i want to solve

regards

Fernando

[David]

Duplicated thread. Please see http://reliabilitydiscussion.com/showthread.php?t=2555.

[FVicente]

Dear David,

Is the same post, because i posted it. I posted in both in "Reliability Analysis" and "System Relaibility Analysis".

Best regards

FErnando