COMPOair - Concrete Ducts
From Aeration Technology
Concrete ducts have proven themselves in the sewage industry for decades. We have used our long-term experience and integrated the advantages of concrete pipes into our aeration system (i.e. looked at stability, cost of purchasing and laying the ducts and protection against aggressive attacks). The big cross-section of the pipe achieves an equal air distribution over the whole length of the compost windrow. This allows for large lengths of the ducts up to 100 m. The concrete aeration duct is directly incorporated into the composting floor (infloor aeration) and can be traversed by any machine (up to 60 tons). The innovative modular system allows implementation of any size of plant. Specifically developed conical jets minimise the risk of plugging. The ideal egg-shape of the drain cross-section secures quick drainage of the leachate water. The COMPOair aeration ducts can be incorporated into both new plants and existing composting areas. The laying is done quickly and cost-effectively.
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Product Details
Load capacity of concrete aeration pipes
For a person who is not a structural engineer it is often difficult to imagine what the fact means, that our aeration pipes can withstand a peak compression force in an uninstalled condition of more than 180 kN/m according to ÖNORM B5074:2012 (EN 1916:2008).
To better present this information we considered a simple test structure:
The concrete aeration pipes are placed on a gravel surface (not 100 % level and compression degree < 100 %) without lateral packing (simulation of a ,,worst case“ installation) and then driven over with various heavy equipment.
Test 1: Driving over the aeration pipe with a wheel loader
In this test a wheel loader commonly used in composting was used to simulate the manipulation. The wheel loader was ballasted so that the vehicle weight (around 13 t) plus an added weight (ca. 3 t) only affects the front wheels so that a load of 8 t is reached on each front wheel.
Test 2: Driving over the aeration pipe with the heaviest equipment
The heaviest equipment we had was a 44 t excavator. Loading it with a 2 t concrete block with a fully extended extension arm it was possible to achieve a concentration of ballast weight on one side of 33 t (16.5 t per wheel). For a better sense of scale the „conventional“ wheel loader used in test 1 is also in the picture.
Summary:
The tests clearly show that the aeration pipes can be driven over by any equipment used on a composting facility without any problems. The test protocols from quality supervision show that it would take equipment weighing twice that used in test 2 to reach breaking load of these pipes.
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