Simplified Scobey formula for determining head loss in pressurized pipes - DOI: 10.7127/rbai.v1601254

Juciano Gabriel da Silva, Marcia Xavier Peiter, Adroaldo Dias Robaina, Jhosefe Bruning, Miguel Chaiben Neto, Laura Dias Ferreira


Head loss in pressurized pipelines is one of the factors that must be considered in the hydraulic design. Therefore, the objective of this work was to simplify Scobey’s empirical equation to calculate head loss in Polyvinyl Chloride pipes with nominal diameters from 32 to 200 millimeters and compare it with the Darcy-Weisbach equation. The performance of the simplified equation was statistically evaluated using the Willmott’s index of agreement, correlation coefficient, performance index and percentage error. The simplified formula showed better correlation than the original equation, excellent performance index, and percentage errors smaller than 6% in most simulations compared to the results obtained by the Darcy-Weisbach equation.

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Revista Brasileira de Agricultura Irrigada - RBAI

ISSN: 1982-7679