Re: Availability formulas used

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