I followed Hirayama autoclave manual. Online manual can be downloaded from this link (http://sydney.edu.au...ries_manual.pdf).
For a more detailed explanation you can start with (https://medschool.va...toclave-service) that showed liquid volume versus autoclaving time needed to achieve 1 to 10^6 Serility Assurance Level (SAL; see wikipedia http://en.wikipedia....assurance_level).
I've also found a paper regarding "top 10 considerations when validating autoclave" (http://www.pharmout...._validation.pdf)
I would just stick to the Hirayama or whichever brand of autoclave you are using because most of the time, we prepare our solutions in "sterile" distilled/deionized water. No need to really go for high SAL.
P.S. 121°C at 15 min is the minimum (and also suitable for media that can't withstand longer sterilization).
Edited by lsek, 18 June 2014 - 12:52 AM.