HERWIG STAINLESS STEEL TECHNOLOGY

Start

Sewage treatment plants

Stainless steel products

Special constructions

Subcontract works

News

Contact

Innovative effluent launder assembly with submerged orifices
Circular or polygonal, made of cold-rolled stainless steel

New >Y-type<-tooth form

This novel tooth form reduces the influence of wind on the quantity of water flowing over the weir. In additon, oxygen enrichment is 0.6 mg/litre higher with the new tooth form than with the *DIN form. This means the oxygen uptake is 24 % higher with the new tooth form. (*DIN = German Standards Institute)

Ypsilon-Form tooth

Launder assembly with submerged orifices in baffle wall


Launder assembly, reinforcement by beading and U-Profil of outer trough

NO CLEANING PROBLEMS
The launder can be cleaned from both sides with a travelling brush. The absence of screwed connections and the use of cold-rolled stainless steel prevents the formation of deposits and drastically reduces algae growth in the launder. The practical design of the launder and the fact that all cut edges are deburred means that the cleaning brushes have a considerably longer service life.

UNAFFECTED BY WIND
The baffle wall with its submerged orifices provides for uniform weir overflow and problem-free discharge. It also prevents scum particles from being discharged with the clarified effluent.

VERTICALLY ADJUSTABLE
The complete launder assembly can be adjusted vertically, even during operation. Being firmly cantilevered from the periphery of the tank, it resists buoyancy forces, while the close sliding fit provides for thermal elongation. In compliance with static requirements, the launder is supported on triangular cantilever assemblies which are made of the same material and are largely resistant to fouling. The cantilevering is fixed to the tank wall by means of stainless-steel adhesible ties. The discharge outlet, which must also provide for thermal expansion, is fitted withan expansion joint.