Message-ID: <2416924.1075840447168.JavaMail.evans@thyme> Date: Thu, 30 May 2002 00:15:00 -0700 (PDT) From: jeff.duff@enron.com To: mark.fisher@enron.com Subject: Re: Availability formulas used Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-From: Jeff Duff X-To: Mark Fisher X-cc: X-bcc: X-Folder: \mark fischer 7-12-02\Notes Folders\All documents X-Origin: FISCHER-M X-FileName: mark fischer 7-12-02 LNotes.nsf Mark, I thought the CA included an LOT term in both the numerator and denominator, which is how I am coding it in the Crystal Reprots application. JD Mark Fisher 05/29/2002 08:30 AM To: Stan Ballard/EWC/Enron@ENRON cc: Hollis Kimbrough/EWC/Enron@ENRON Subject: Availability formulas used These are the approximations (since no manual data was used) used in the tables you were provided. "Enron Availability" ea = (SOT+LOT+WOT+EST)/ST Contractual Availability (EPC) ca=(survey-DT-RT-MT)/(survey-4/(31*24)) Where SOT= System OK time DT= Down Time LOT= Line Out Time WOT= Weather Out time EST= External Stop Time MT= Maintenance time RT= Repair time ST=SOT+DT+LOT+WOT+EST+MT+RT survey= Survey time the 4/(31*24) is an approximation for the prorating of the allowed "4 hours per month" for maintenance time. If you have questions let me know. Mark