I find that keg cleaners are about 5 thousand dollars. Is there cheaper ones? Or ways to make your own?
There are a bunch of ways to make your own.
The intent is to clean. To do that, you must:
1. Purge the CO2 and old beer. Purging and dumping are easily done with an old Sankey coupler. Put the keg on its side and tap it. When pressure is bled off, invert the keg, then hit it with a hot-water rinse. Drain.
2. Use a high-pressure pump to force cleaning solution into the inverted keg. The hot cleanser should recirculate to the cleanser's specifications. Rinse.
3. Sanitize with another recirculation and a different relatively high-pressure pump.
4. Purge with CO2 and pressurize.
You can make your own with a used stainless double sink from a restaurant supply equipment dealer, some plumbing, and a couple of pumps. For the hot caustic rinse, you'll need a high-pressure pump. For the sanitizer, you can use a submersible pump from a place like Lowe's; just make sure to get a unit powerful enough to shoot a jet.
The idea is to force the solution and rinse water up through the inverted keg's stem, so the stream hits the bottom (or top, when the keg is inverted) and covers the entire interior surface of the keg. The solution drains out the "gas in" port of the coupler (don't forget to remove the check valve!).
You can plumb a manifold to get water into the keg. I made one where the caustic recirculated in one side of the double sink. The sink drain connected to the input of a CIP pump, with the pump's output going to the "beer out" fitting of a Sankey coupler. The other sink had sanitizer and a submersible pump (IIRC, it was a pretty stout sump pump...). The sanitizer side had a manifold of valves for cold water and sanitizer.
In order, I did the following:
1. Clean the exterior of the keg with caustic. Rinse.
2. Release the internal pressure with a loose Sankey coupler. When pressure drops, invert the keg to drain old beer.
3. When drained, connect keg to coupler connected to hot water; the "gas out" fitting on the coupler has a drain hose which leads to the old-beer discard point (that may or may not be the floor drain; depends on your local codes). Rinse until no more scunge comes out.
4. Disconnect keg, move to caustic side. Connect coupler to keg and invert. "Beer out" fitting of coupler is connected to centrifugal pump output. "Gas in" fitting is disconnected, to drain into the sink. Recirculate according to cleanser recommendations.
5. Stop pump, let drain. When drained, move back to rinse fitting. Rinse.
6. Connect sanitizer fitting, invert over sanitizer sink. Recirculate until sanitizer specifications are met. Drain (and perhaps rinse, depending on specs).
7. Remove from contraption, set upright, and purge with CO2 at 5psi. Connect CO2 to "beer out" fitting, and let "gas in" unrestricted. A few seconds is usually sufficient.
8. Lather, rinse, repeat until all kegs are clean.
Once you get a good flow going, you can have a keg going at each stage. Makes it simple.
Any more Qs, let me know!
Bob