Gas hoods from in-house production

The Träxler gas hood is equipped with strong mechanically machined flanges in the transition from gas hood to tank frame, curved discs are welded. An O-ring is used as gas-proof seal between gas hood and frame. This O-ring is inserted in a mechanically processed groove. The reinforcement of the ribs is calculated by using a load analysis per FEM Finite Element Method.

Träxler's benefits

• Gas hood and support flange are on top of one another parallel and level, form-fit and non-displaceable. They transfer the dynamic forces and vibrations of the mixer directly to the substructure.

• The gas hood with the mixer can be uninstalled at any time. The impeller clearance in the draft tube pipe remains unchanged during the re-installation. It does not require any readjustment.

• Defined sealing forces ensure reliable effect and a long life of the gas hood seal.

Träxler offers the better solutions

Common gas hoods are made of plate-shaped discs. Typically their flanges have the same low material thickness in the area between gas hood and frame. There is only one flat gasket as a seal between the gas hood and the digester tank frame.

Träxler, on the other hand, has solid flanges which, together with the rib reinforcements, absorb the high loads. The gas-tight seal between the gas hood and the frame is provided by an O-ring which is embedded in a mechanically machined groove.

The consequences in many of the previous solutions

• A flat seal sits between the gas hoods and the frame of the digester tank. This doesn`t transfers the forces and vibrations directly from the gas hood to the digester tank construction. A swinging up of the mixer and gas hood is easily possible, e.g. in case of foreign bodies or twisted hairs, wipes and debris accumulation on the impeller.

• After the gas hood will be removed, it is not possible to be easily reinstalled without any readjustment of the impeller clearance on the guying inside the digester tank.

• If a common gas hood has a leak on the flat seal, the connector screws on the gas hood are usually further tightened. As a consequence, the impeller clearance may be reduced to the point that the mixer touches the draft tube pipe.

Common gas hood with flat seal

Träxler gas hood