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Water 2015, 7(10), 5284-5304; doi:10.3390/w7105284

Empirical Formulas for Calculation of Negative Pressure Difference in Vacuum Pipelines

Division of Water Supply and Sewage Systems, Department of Civil Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences—SGGW, Nowoursynowska St. 159, Warsaw 02-776, Poland
Academic Editor: Enedir Ghisi
Received: 24 March 2015 / Revised: 21 September 2015 / Accepted: 28 September 2015 / Published: 9 October 2015
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Abstract

The paper presents the analysis of results of empirical investigations of a negative pressure difference in vacuum pipelines with internal diameters of 57, 81, 102 mm. The investigations were performed in an experimental installation of a vacuum sewage system, built in a laboratory hall on a scale of 1:1. The paper contains a review of the literature concerning two-phase flows (liquid-gas) in horizontal, vertical and diagonal pipelines. It presents the construction and working principles of the experimental installation of vacuum sewage system in steady and unsteady conditions during a two-phase flow of water and air. It also presents a methodology for determination of formula for calculation of a negative pressure difference in vacuum pipelines. The results obtained from the measurements of the negative pressure difference Δpvr in the vacuum pipelines were analyzed and compared with the results of calculations of the negative pressure difference Δpvr, obtained from the determined formula. The values of the negative pressure difference Δpvr calculated for the vacuum pipelines with internal diameters of 57, 81, and 102 mm with the use of Formula (19) coincide with the values of Δpvr measured in the experimental installation of a vacuum sewage system. The dependence of the negative pressure difference Δpvr along the length of the vacuum pipelines on the set negative pressure in the vacuum container pvzp is linear. The smaller the vacuum pipeline diameter, the greater the negative pressure difference Δpvr is along its length. View Full-Text
Keywords: sewage; domestic sewage; vacuum sewage system; negative pressure difference; vacuum pipeline sewage; domestic sewage; vacuum sewage system; negative pressure difference; vacuum pipeline
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kalenik, M. Empirical Formulas for Calculation of Negative Pressure Difference in Vacuum Pipelines. Water 2015, 7, 5284-5304.

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