Experimental Study On Effect Of Drainage Capacity Of Double Stacks System With Different Discharge Tee And The Position Of The Vent Linked To The Drain

The experimental study on the double stack drainage systems using cast iron pipes and fittings. comparing the test results by using different drainage tee bottom elbow and changing different location of the H tube.then the drainability of different combinations was obtained. This study summarized how the different drainage tee and?bottom elbow and different location of the H tube affected the drainage capacity.The testing tower is 60 meters high.The test based on the steady flow methord. The water is discharged in turn from the top according to different flow rate in order to simulate the worst drainage condition.Traffic increased by 0.5 L/s at a time.Each layer of maximum flow rate is 2.5 L/s. the drainability of different combinations is The sum of each layer of accumulation.This test automatically control the floor rate of the corresponding floor by setting the traffic of each layer. This paper mainly studied the following three aspects:Firstly, Each layer ventilation pipe connect to the close-in upper portion of the tee,the drainage capacities of T and Cyclonic tee double stack drainage systems with 90-degree elbow connected to Adjustable joints and 90-degree curvature adjustable elbow were tested and analyzed contrastively.The results showed that the drainage capacity with T tee and 90-degree elbow connected to Adjustable joints was 7L/s. The others were 7.5L/s.Secondly, Each layer ventilation pipe connect to the middle of the adjacent tee. the drainage capacities of T and Cyclonic tee double stack drainage systems with 90-degree elbow connected to Adjustable joints and 90-degree curvature adjustable elbow were tested and analyzed contrastively.The results showed that the drainage capacity with T tee and 90-degree elbow connected to Adjustable joints was 7L/s. The others were 7.5L/s.the drainage capacity with Cyclonic tee and 90-degree curvature adjustable elbow was 7L/s. The others were 7.5L/s.Thirdly, Each layer ventilation pipe connect to the close-inlower portion of the tee. the drainage capacities of T and Cyclonic tee double stack drainage systems with 90-degree elbow connected to Adjustable j oints and 90-degree curvature adjustable elbow were tested and analyzed contrastively.The results showed that changing the location of the H tube made a Significant effect. when the ventilation pipe connecting to the close-in lower portion. the drainage capacity with Cyclonic tee and 90-degree curvature adjustable elbow was 11L/s. the drainage capacity with Cyclonic tee and 90-degree elbow connected to Adjustable joints was 10L/s. when the Cyclonic tee were changed into Ding tee. the drainage capacity with Ding tee and 90-degree curvature adjustable elbow was 9L/s.the drainage capacity with Ding tee and 90-degree elbow connected to Adjustable joints was 8.5L/s.