An Experimental Study on the Discharge Characteristics of Different Type of Water-Saving Toilets and Horizontal Drainpipe Carrying Performance for Horizontal Drainpipe Design

Otsuka, Masayuki; Matsuo, Takafumi; Hirofumi, Kagami; Kazuya, Akiyama

doi:10.3130/aije.82.367

Cited by 4 publications

(1 citation statement)

References 1 publication

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“…[13][14][15][16][17] Otsuka provided five predictive methods based on ventilation systems and gradually concluded the predictive models of the single-stack drainage system, suction valve equipped drainage system and special ventilation system. [12][13][14][15][17][18][19][20][21] In 2011, Liao et al 22 studied the air pressure fluctuation of the drainage system in a highrise office building. This study illustrated the air pressure changes along with the pipe height under a transient flow condition, and it also tested the air pressure fluctuation frequency, the maximum and average pressure, and their standard deviations.…”

Section: Introductionmentioning

confidence: 99%

Influence of installation of S-shaped pipe offset on the water flow capacity of double stack drainage system in a high-rise building

Guan

Fang

Yuan

et al. 2019

Building Services Engineering Research and Technology

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In high-rise and ultra-high-rise residential buildings, the drainage systems usually adopt the S-shaped offset pipe joint to avoid collisions of pipelines with beams and columns. However, the flow direction changes at the offset point would significantly affect the drainage capacity of the systems. To better understand the influence of pipe offset joints on the drainage capacity, three different building drainage systems namely YZW 1, YZW 2, and YZW 3 systems, were built up and investigated. YZW 1 system is a standard double-stack drainage system with anti-reflux H-tube joints. YZW 2 and YZW 3 systems were developed from YZW 1 by adding S-shape offset pipe joints on the 4th floor. An extra anti-reflux H-tube joint added 1 m above the offset joint as a measure for improving the drainage capacity differentiates YZW 3 system from YZW 2 system. The pressure fluctuation and water seal losses were adopted as experimental parameters to determine the maximum discharge capacity according to Standard for Capacity Test of Vertical Pipe of the Domestic Residential Drainage System. The experimental results show that the discharge capacity limitation of the drainage system with the offset joint is 6.5 L/s, which is much smaller than 11.0 L/s of the system without the offset joint. In the experiments with the offset joint, the pressure fluctuated fiercely at the position where flow direction changed and caused severe water seal losses of the floor drain and P-shaped trap. An anti-reflux H-tube joint above the original offset joint was observed to relieve the pressure fluctuation as an improvement and the drainage capacity was improved to some extent. The relationships among the maximum discharge rate, pressure fluctuation transients, and water seal losses were discussed. Lastly, a nondimensional analysis was adopted to understand the relationship between water seal losses and pressure limit values under different discharge rates for current test facilities. Practical application: A method has been tested and approved to effectively improve the discharge ability of a building drainage system that includes offset. The application of S-shape-offsets in high-rise building drainage systems can relieve the discharge congestion typically caused by standard pipe offset arrangements.

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Section: Introductionmentioning

confidence: 99%

Influence of installation of S-shaped pipe offset on the water flow capacity of double stack drainage system in a high-rise building

Guan

Fang

Yuan

et al. 2019

Building Services Engineering Research and Technology

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A Study on a Practical Method for Estimating the Performance of Conveyance for Water–saving Toilets in the Horizontal Drainage Piping for Apartment Houses

Otsuka

Matsuo

Shigefuji

2018

Journal of Environmental Engineering (Transactions of AIJ)

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The study proposes a simple method for estimating the performance of different water-saving toilets in conveyancing experimental waste substitutes into the horizontal drainage piping (in terms of conveyor distance and the number of elbows) for apartment houses, and discusses the effectiveness and applicability of the method through demonstration on 15 different water-saving toilets. In the study, the fixture discharge characteristics of each toilet were calculated by using a simulation model and clean flush water. A conveyor distance was then estimated by collating the calculation results with the average fixture discharge rate, which was determined, in a performance of conveyance experiment, as a conveyance limit value, and the estimated conveyor distance was compared with the actual measured conveyor distance to verify the estimation accuracy.

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Experimental Study of Fixture Discharge Characteristics and Carrying Performance of Water Saving Toilets in Horizontal Drainage Pipe With Different Piping Diameter

AKIYAMA,

OTSUKA,

KUBOTA

et al. 2023

Journal of Environmental Engineering (Transactions of AIJ)

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This study aims to evaluation of carrying performance when water saving toilets are connected to drainage pipes in various configurations, and makes use of it for plumbing design. Internationally, ISO 31600:2022 was established as a standard for labeling and performance testing of waterusing equipment, including toilets. However, this standard is limited to equipment and do not take into account the waste carrying performance.In this report, carrying performance when the amount of flushing water, the pipe diameter, and the gradient are changed in straight pipe is experimentally identified.

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An Experimental Study on the Discharge Characteristics of Different Type of Water-Saving Toilets and Horizontal Drainpipe Carrying Performance for Horizontal Drainpipe Design

Cited by 4 publications

References 1 publication

Influence of installation of S-shaped pipe offset on the water flow capacity of double stack drainage system in a high-rise building

Influence of installation of S-shaped pipe offset on the water flow capacity of double stack drainage system in a high-rise building

A Study on a Practical Method for Estimating the Performance of Conveyance for Water–saving Toilets in the Horizontal Drainage Piping for Apartment Houses

Experimental Study of Fixture Discharge Characteristics and Carrying Performance of Water Saving Toilets in Horizontal Drainage Pipe With Different Piping Diameter

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