EXAMINATION OF DRAINAGE PERFORMANCE WHEN AN AIR-ADMITTANCE VALVE IS APPLIED IN ONE LOCATION ALONG THE HORIZONTAL FIXTURE BRANCH

Study on the drainage performance and a method for predicting the same of a high-rise stack drainage system having air-admittance valves installed to the vent pipe and the horizontal fixture drain branch (Report 1)

Abstract

This study has two objectives: to understand the drainage performance of a high-rise stack drainage system when air-admittance valves are installed; one in the vent pipe section and another in the horizontal fixture drain branch section, and to consider a method for predicting the drainage performance of the system by suggesting a pipe network model. This report first aims to identify the basic characteristics of the pipe pressure in relation to the airflow rate through a drainage load experiment in which air-admittance valves are installed; one in the vent pipe section and another in the horizontal fixture drain branch section of a stack drainage system, and air is drawn in from the installation locations. The report then proposes a pipe network model for predicting the aforementioned airflow rate and pipe pressure, estimates the drainage performance from analysis results, and examines the validity of the prediction method.