My name is Greg. I am the Facility Operations Specialist at one of the largest PWing companies in the world; the U.S. Gov't. @ Dale Hollow National Fish Hatchery. Celina, TN (U.S. Fish and Wildlife Service). We have 104 concrete fish containment units we call raceways. We grow 320,000 lbs of trout per year, on average. That makes us the second largest producing hatchery in the southeastern U.S., and we probably grow more weight per gpm flow of water than any of the 70 national hatcheries or even most of the hundreds of state hatcheries around the country.
The raceways are 8' wide X 100' long and normally contain 800 to 2,000 lbs of trout in each raceway. These raceways have constant running water through them at an average depth of 1 1/2 feet. When the fish are periodically emptied out (which occurs when we move fish around the hatchery or when distributing them to tail waters and reservoirs in middle and east Tennessee), we remove the screens that hold the fish, divert water around the raceways, drain them down to about 1-3 inches deep (as some water continues to seep through when sealed off), and then pressure wash them before filling them back up with more trout. Each raceway will end up getting 1-2 cleanings per year. We're removing mostly algae but also uneaten, broken down fish feed, and fish waste; but the algae is the main reason for the need to pressure wash, as the other stuff could be removed just by sweeping the raceways out. The drained-out water goes into a waste-water treatment system that is also ran by us; so we have no recovery limits to speak of, which is a good thing, because we produce alot of crap when we pressure wash one of these raceways.
Thank goodness for this forum. It has already been so helpful to me, and the four other guys who work with me, but I've not yet really done an introduction. We have little time while on the clock to tinker with PWing equipment in order to make our systems better, more useful, and to keep them running at peak performance all the time, because we have so many other tasks to complete, and we work for the guy responsible for growing and distributing the fish; so that's his main focus. Even though time for maintenance and upgrading is limited where I work, the PWing operation is a huge part of what we call "fish work". Without quick pressure-washing jobs being done continually throughout the year, our "fish work" slows to a crawl, because it's one of the steps of our normal operation of our hatchery. And without good, easy-to-use, and quick cleaning equipment, the PWing operation becomes very fatiguing on our workers. Thanks to the folks at this site, things aren't so fatiguing anymore; at least with respect to PWing.
The folks on this site have helped me already cut our raceway cleaning times in half from where we were just a year ago. I'm looking to hopefully cut our time in half once again through equipment upgrades, set up improvements, and procedural changes. This is why going to a forum like this is so helpful. I can find out how to correct something or make something better when off duty or at home, and then correct it during my lunch the next day, or in some instances, it might take a couple of weeks worth of lunches to make it happen. Every now and then, I can even get the boss to give me an hour or so to work on our equipment or setup. I guess we could say that you guys, as taxpayers, are getting your monies worth with me. I'm an operations person through and through. I can't stand bottle necks in an operation. PWing has always been our biggest bottle neck; it still is to some degree, but it's getting better, and this forum is the reason why.
Just wanted to check in and introduce myself for those who haven't read my posts in the past and thank everyone who has given me advice so far. The latest accomplishment was going from one of those integral-style unloaders that the relieve valve kept messing up, to an unloader with a return line, and the help given here was crucial. That particular unit had lost about 1/3 of its pressure. I thought it needed a pump rebuild or something major, but turns out, that when I put the new unloader on it, it was back to 100% strength. So it just had a bad unloader. $40 and 45 minutes, a little advice on how to plumb it from you guys; and it's totally fixed! Thanks again!