First up, S.K. Energy Consulting: There are some simple to understand articles on Floating Head Pressure and Optimizing Defrost. Check out the articles archives which contain almost 80 newsletters going back several years. Very informational site that I am surprised I hadn’t come across before.
Second, my friend and colleague Bryan Haywood has an excellent article at SAFTENG.NET about how the state of Oregon has changed the rules of the game concerning the retail exemption for PSM regarding Ammonia. Bryan explains the implications for the RMP filing situation as well. SAFTENG.NET is always worth your time to check out and if you are on LinkedIn they also have an excellent forum there.