Some variations and novel applications of a system you first read about in PM.
If you've been following the Hydronics Workshop column for a few years, you may remember reading about minitube systems. In the April 1997 column I described this variation on the basic concept of variable speed injection mixing. A complete description was also presented in the August 1999 issue of PM Engineer (check it out at www.PMEngineer.com).
A schematic of a typical minitube system is shown in Figure 1.