Elbows - Solve Yet Another Previously Unfixable Problem
Working just like a river with a waterfall, Dam Buster elbow devices use the free power of gravity to safely change the direction of water in a box gutter mid stream by ninety degrees. This is achieved by a fully engineered and tested step down in the elbow device which is installed at a convenient location upstream of the ultimate point of discharge.
That means huge flexibility in roof drainage design whereby box gutters can be directed easily and safely around corners and obstructions, and to a more appropriate outlet point some distance away.
Unlike conventional sump type devices used for similar purposes, these Dam Buster devices require absolutely no pipe work and also have very minimal clearance - depending on the device the clearance is either 50mm or up to 70mm maximum. This in turn reduces installation and construction costs.
Both Left and Right hand versions are available, to suit box gutters between 200mm and 600mm wide, but as with all of our products, sizing ultimately depends on the flow rate being dealt with, and the corresponding flow rate at the end outlet.
Elbow devices are available in a contracting version as standard. This means they can be adjusted on site by the installing plumber without any extra tools to precisely suit any incoming box gutter width. For example, the ELB-400 contracts to accurately fit any box gutter between 300mm and 400mm. Fixed versions are also available (to special order).
Product dimensions can be found HERE.
NB: Requirements vary from state to state but generally a Performance Solution is required for installation certification purposes of these Dam Buster devices; that document should be developed by a suitable expert such as a qualified hydraulic engineer, in accordance with the requirements of the National Construction Code. Documentation to assist the development of a Performance Solution - including Template Documents for all states and territories - can be sourced here at Technical Downloads
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But How Does It Work?
The Dam Buster Elbow works like a free flowing river with a waterfall. Theoretical analysis by Dam Buster’s hydraulics expert, Adjunct Assoc. Professor Dr Robert Keller, along with extensive physical testing, has firmly established that the energy loss at the 90 degree bend in the Dam Buster Elbow device is less than the energy released by the engineered drop built into the device, and consequently backwatering cannot occur in the box gutter. The physical testing also confirmed there is significantly more freeboard in the critical locations within the device than is required under the applicable standards, and finally, the additional energy released from the built in drop also enhances self-cleaning of the box gutter.