Statistical Modeling of Head Loss Components in Water Distribution within Buildings

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Author(s) J. I. Sodiki
Pages 101-120
Volume 3
Issue 2
Date February, 2014
Keywords Loss ratios, pipe fittings, water distribution within buildings, regression analysis.

Fractions of the total head loss which constitute the loss through fittings were computed for varying lengths of first index pipe run, total flow rate and number of sanitary appliances supplied, in a water distribution system within a building. The results were used in a regression analysis to obtain second order equations which gave a general increase of the fraction from 0.263 to 0.420 for an increase in length of first index pipe run of 28.3m to 140.3m; from 0.262 to 0.429 for an increase in the total flow rate of 0.6L/s to 4.4L/s; and from 0.238 to 0.393 for an increase in the number of supplied sanitary appliances of 8 to 120. The correlation coefficients between the ratio of loss through fittings to the total head loss and each of the variables of pipe length, flow rate and number of appliances were 0.97, 0.95 and 0.91, respectively; which were found to be acceptable for a 99% confidence level. The ratios are useful for quick estimate of losses in water distribution systems in buildings, needed in determining the suitability of water reservoir elevations and lift pump head requirements.

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