A home brewing single-tier brewing sculpture or beer rack is a single level brewing configuration where all of the brewing kettles are at the same level. Single-tier brewing racks typically consist of a hot liquor tank, mash tun, and boiling kettle. One or two pumps are used to transfer liquid from one kettle to another.
A notable benefit of a single-tier brewing sculpture over a multi-tier one is ease of access to the kettles. On a single-tier platform, the kettles are all at one low height, so it makes it safe and easy to stir the mash, add water to the hot liquor tank, or transfer the wort from the boil kettle. If the single tier system is constructed high enough off the ground, gravity can still be used to transfer wort from the boil kettle to the fermenter. Single tier beer racks also tend to be more stable then a multi-tier rack; trust me when I say that one of the last things you want is 15 gallons of burning hot liquid pouring down upon you due to an unstable rack or earthquake.
Cleaning and unloading grain from kettles is also very easy with a single-tier design since no step stool is required to reach any of your kettles. I personally use a single-tier brewing rack that I designed and constructed myself. It was a good deal of work, but I also learned a lot while building it. If you prefer not to build your own, there are some really fantastic stainless steel models available for sale here:
Below is a photo of the brewing rack that I built. It uses 2 pumps, 3 burners, and 3 (20 gallon) Blichmann brewing kettles. If you have any questions on building your own, please feel free to drop me a line.
Here is a MoreBeer.com single-tier brewing sculpture. You can click the photo to go to their site: