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Open AccessArticle

Real Values of Local Resistance Coefficients during Water Flow through Welded Polypropylene T-Junctions

1
Institute of Environmental Engineering, Warsaw University of Life Sciences—SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland
2
Institute of Civil Engineering, Warsaw University of Life Sciences—SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Water 2020, 12(3), 895; https://doi.org/10.3390/w12030895 (registering DOI)
Received: 13 February 2020 / Revised: 18 March 2020 / Accepted: 19 March 2020 / Published: 22 March 2020
(This article belongs to the Section Hydraulics)
The paper presents results of investigation of the local resistance coefficient ζ in welded polypropylene T-junctions with the internal diameter 13.2 mm. The investigations were performed on an independently constructed test rig. The scope of investigations encompassed the T-junctions, which were (1) properly warmed up and properly pressed, (2) poorly warmed up and poorly pressed, or (3) excessively warmed up and excessively pressed. The local resistance coefficients ζ determined by measurements according to the standard PN-EN 1267:2012(Designation of the Polish Standard) were compared to those determined with use of the nomograms recommended for designing water supply systems and installations. Real values of the coefficients ζ, obtained in measurements were significantly higher than those read from the nomograms. The local resistance coefficients ζ in welded polypropylene T-junctions depend on water flow velocity and the manufacturing precision of a T-junction joint. View Full-Text
Keywords: water supply system; local resistance coefficient; polypropylene welded T-junction; pressure difference water supply system; local resistance coefficient; polypropylene welded T-junction; pressure difference
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MDPI and ACS Style

Kalenik, M.; Chalecki, M.; Wichowski, P. Real Values of Local Resistance Coefficients during Water Flow through Welded Polypropylene T-Junctions. Water 2020, 12, 895.

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