2021 Volume 46 Issue 294 Pages 19-26
This study proposes a hybrid drainage system, by employing a combination of a “force-feed drainage system” (that comprises a force-feed pump unit and small-diameter force-feed pipes) and a “gravity drainage horizontal pipe system” (in which drainage flows by gravity). This system ensures good drainage even when plumbing modifications or extensions are carried out because of the conversion or renewal of newly built or existing office buildings. The study also aims to evaluate the performance of the proposed system, thereby facilitating the effective the design of the system. Among the various types of hybrid drainage systems mentioned in the initial report1), this report focuses particularly on the “system using existing horizontal fixture branch”, in which existing horizontal fixture branch in a building are used and drainage is pumped up from the downstairs by the force-feed drainage system. This study also determines the basic drainage performance of its system with the aim of collecting data.
