The Study On Cyclonic Tee Joint’s Structures Of Single Stack Drainage System Affect Its Drainage Capacity

The domestic building water supply and drainage technicians did manyresearching and testing works for developing special single stacks and compilingrelative specifications. After testing and comparing the drainage capacity of singlestack systems of which the inner structures of cyclonic tee joint were different, thisstudy summarized how the different structures of tee joint affected the drainagecapacity, and analyzed the corresponding reasons.The12-floor drainage testing device was the researching object in thisexperiment; the water was discharged in turn from the top according to different flowrate in order to simulate the worst drainage condition. The pressure sensors were usedto measure the instantaneous fluctuant value of pressure and the water level gaugeswere used to measure the changes of water seal in every trap during the drainage.The following four aspects were discussed in this paper:Firstly, the drainage capacities of overall expansile volume and partial expansilevolume cyclonic tee joint single stack systems were tested and analyzed contrastively.The test results showed that the former was13.3%bigger than the latter. It wasfeasible to properly broaden the volume of this type of special tee joint to improve thedrainage capacity in theory and in practical projects.Secondly, the drainage capacities of single stack systems of which the angle offlow-guided vanes in cyclonic tee joint were25°,30°and35°were tested andanalyzed contrastively. The test results showed that the relationship between thedrainage capacity and the angle of flow-guided vane was a convex curve; the largestdrainage capacity was9.5L/s when the angle of flow-guided vane was30°under thetesting conditions.Thirdly, the drainage capacities of single stack systems of which the number offlow-guided vanes in cyclonic tee joint were1piece,2pieces and4pieces were testedand analyzed contrastively. The test results showed that the order of drainage capacitywas4pieces,2pieces and1piece from large to small. The drainage capacity would increase with more flow-guided vanes, but in practical projects, the number of itcouldn’t be much more because the ball passing rate of ball passing test should be100%.Fourthly, a project example which applied the WAB-I cyclonic strengtheningspecial single stack drainage system was analyzed in this paper. The result told us thatthe project direct cost which applied WAB-I cyclonic strengthening special singlestack drainage system was9.14%less than that which applied the traditional doublestack drainage system, and the former’s workings hours were43.1%less than thelatter’s. Applying this type of special drainage system should meet the requirementsof codes and specifications from the system choosing to design and construction inengineering. It would bring good economic and environmental benefits to investorswhen applying this kind of special single stack system in suitable places.