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Building the GEK Gasifier in seven parts

Step 22Downdraft reactor - 7

Install Nozzles

Weld 3/8 street elbows onto ends of 1" air nozzle tubes. Make sure the elbows are angled at 90 degree from the nozzle tubes
Screw in 1/2" X 6" pipe nipples into bottom of the reactor. Tighten modestly with pliers
Put clay gasket material around bottom of nipples, and a thin coating around the threads at the top of the nipples
Push the nozzles down over the nipples, into the clay. Take care to not get clay sealant into the nozzle tube passage.
Depending on your nozzle preference, and desired final height, you may want to install some spacers on the 1/2" nipple before pushing on nozzle tubes. In general, you should start with the nozzles at a height above the reduction cone, equal to the diameter of the reduction cone entrance.
The nozzles should point inwards towards the center of the reactor, and be firmly positioned in the clay. They should be difficult to turn.