High-rise Testing of Active Drainage System Compared with Conventional Venting on Two Test Towers

摘要

Active Drainage Ventilation has been a subject of a number of CIB W062 papers over the years, with the development of the Positive Air Pressure Attenuator and Air Admittance valves.With buildings being built taller each year and many being designed in excess of 400 meters, with mixed use occupation hotels, office and residential all discharging into one stack.The drainage systems are being subjected to grater loadings in different zones at any one time.The effect of negative transients and positive transients is becoming a greater issue, due to the time it takes for the system to balance.With the vents to atmosphere being further away and the increased communication time for the pressure regime within the pipe leading to the system pressure exceeding 400Pa with the loss of water trap seals.National codes still do not proved sufficient information to the design engineers for tall buildings due to many being based on steady state flows versus the real inherently unsteady sate discharges that occur.The paper will present findings of physical testing data carried out on two testing towers.The testing will compare the capabilities of the active drainage ventilation verse conventional venting methods for tall buildings.The testing subjects both systems to unsteady discharges to determine the maximum loadings in both 100mm and 150mm sized pipes systems with the key criteria being that all the traps seals are maintained.Further tests subject the drainage system with solids, wet wipes and sanitary towels.The aim of this paper is to provide data for national code bodies on the capabilities of both systems, to meet the demands of the drainage system to the unsteady discharges in tall buildings so that the water traps seals continue to provide the barrier between the drainage system and the occupied space within the building.