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Keggle Conversion 101


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#1 MtnBrewer

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Posted 29 March 2009 - 11:56 AM

Keggle Conversion 101Contributed by BFBI recently needed to convert a keg into a brew kettle and while doing it I thought about how many people post questions about how to go about it. I thought it would be nice if I posted how I went about doing it along with some photos showing steps along the way. I realize that this is just one of many ways to go about the task, but this is a starting point and I'm sure others can share their methods as well. My choice requires a few simple tools, and the die grinder can easily be substituted with a Dremel Tool. For what it's worth I had just over an hour in doing this project. That is once I had the tools gathered and such. Also, I'm sorry I don't have pictures of me doing the actual work. I was home alone when I did this.Note: Please obtain your keg from a legal source. It is not ethical (and may be illegal as well) to pay the deposit on a keg and then just keep it, forfeiting your deposit. The safest way is to get your keg from a reputable dealer, like Sabco. Kegs can often be obtained from scrapyards as well.Q: How do I get started?A: The first thing you want to do is gather the tools required for the job.Attached File  01.jpg   35.71KB   37 downloads
    [*] Make sure that you have eye AND ear protection[*]I used a die grinder with a thin cut off wheel to open up the keg[*]An electric hand grinder with a sanding disk to touch up the opening and remove rough edges[*]A 3/8" drill with a 3/4" hole saw** for the bulkhead hole. **Please note that the instructions with the bulkhead kit say 7/8". I used a 3/4" because a hole saw is not what you would call precise and does move around a bit. By the time you clean the burr from the hole, the bulkhead fits nice and snug. You can also use a step bit (AKA uni bit) for this, but a hole saw will cost much less. I have converted 7 kegs to date and am still using the same hole saw.[*]Also needed but not pictured are a pair of gloves to protect from sharp edges, a file for cleaning up the bulk head hole (or a carbide bit in tour die grinder) and some Teflon tape.[/list]Q: Okay, I have all the tools and I'm ready to go. What's next?A: Next you will want to relieve any pressure that may still be in your keg. You can do this by putting a towel over the tap connection and pressing the steel ball with a screwdriver to relieve the pressure. This may be a little stinky depending upon how long the swill has been in the bottom of the keg. The towel is needed so you don't get a face full of the foul stuff at the bottom of the keg. wink.gifNow make a line around where you want to make your cut.Attached File  02.jpg   45.92KB   39 downloadsMy hole is about 13" in diameter. Also shown is my die grinder -- you may have your Dremel Tool ready here.Now, with your tool of choice, start to cut lightly on your line. I was able to steady my hands where the tap would connect and I slowly walked around the keg, cutting lightly and a little deeper each time around. After about 15-20 minutes and one disc change, I was through.Attached File  03.jpg   42.06KB   32 downloadsI didn't have much stinky stuff at the bottom.Attached File  04.jpg   47.79KB   25 downloadsNow you'll want to take your hand grinder and finish off the opening.Attached File  05.jpg   41.99KB   31 downloadsThis is a disc with layered sandpaper, which takes off sharp edges and leaves a very nice finish. You can also use sand paper and do it by hand, just make sure to wear some gloves so you don't cut yourself!Q: What should I do about the old swill at the bottom of the keg?A: I took a break after finishing off the opening to do a soak with some PBW to clean the inside of the keg. I did it now so I could fill the entire keg for a thorough cleaning and not have to run stinky/stale/funky beer through my new fittings.Q: So now the keg is all clean and I'm ready for the next step.A: Now you need to drill the hole for your bulkhead fitting. I marked and punched a spot 3-3/4" up from the bottom of the keg to the center of the bulkhead hole. Just make sure that you don't put it right above one of the vent holes in the bottom ring of the keg. This way fire from your burner won't damage the fitting or the seal.When drilling with a hole saw, I find that a coating of Pam cooking spray works fine for a lubricant. Drill with a fairly slow drill speed and moderate pressure. You will feel the drill bit, then the hole saw working at the proper speed. It will only take a minute or so to drill the hole as the keg is really thin. Remove any rough edges with a file or a bit in your die grinder or Dremel tool.Here's the finished hole.Attached File  06.jpg   35.43KB   42 downloadsMy bulkhead fitting of choice for this is a Zymie's bulkhead fitting and can also be seen at https://www.zymico.com/.Here's what the kit looks like.Attached File  07.jpg   32.66KB   46 downloadsIt comes with very good instructions that even I can follow. The picture shows the parts as they will be assembled in the keg. Bulkhead and washer go on the inside, the o-ring and nut go on the outside. There are important instructions about tightening included with the kit. Follow those instructions and your o-ring will not get damaged.Here's what the bulkhead looks like inside the keg after assembly.Attached File  08.jpg   24.04KB   41 downloadsHere's what it looks like on the outside with a ball valve attached.Attached File  09.jpg   27.69KB   41 downloadsMake sure you wrap the threads with Teflon tape first to prevent leaks.Q: Am I ready to brew now?At this point your keggle is basically complete except for the pick up tube of your choice and a dump tube of your choice. I like to use a Bazooka Tee for the pick up end and just some soldered copper tube to dump into my fermenter. The Bazooka Tee can also be seen at https://www.zymico.com/. I'm sorry I don't have all the detailed instructions on how to make these as I transferred these parts from my existing keggle. Basically the parts are just soldered 1/2" OD copper tube, a couple of 1/2" ID copper elbows and 1/2" male pipe fittings that screw into the bulkhead and ball valve.Here's what they look like before I put them in.Attached File  10.jpg   26.82KB   44 downloadsHere's the inside all completed.Attached File  11.jpg   29.03KB   46 downloadsHere's the outside all completed.Attached File  12.jpg   35.29KB   42 downloadsWhen complete, clean again and run some boiled water through the fittings for a final cleansing and to check for leaks.I hope this helps answer some people's questions about how to make a keggle. I also hope you see that it's not very hard or time consuming at all.McMaster-Carr part numbers (thanks Mainelybrew)4464K214 Stainless full coupling, 1/2" pipe size,4830K171 Stainless Steel 1/2" Close Nipple, Fully Threaded,98126A797 Stainless Steel Shim(sold only as a pack of 10 @ $10.38)9396K32 Silicone O-Ring (sold only as a pack of 50 @ $14.53)*4429K124 1/2" Locknut, Brass (with groove for o-ring)4190K22 1/2" Brass Ball Valve, Full Port


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