Analysis of methodologies for determination of the economic pipe diameter

Abstract

The design of water distribution systems includes, above all, the determination of the pipe size that meets the requirements of the system and brings reduced annual costs of installation and operation. Among the existing methodologies for the economic pipe diameter determination, Bresse’s equation is still common among designers. This work aims to analyze the efficiency of Bresse’s equation, the MBPW and the MLVPC, comparing them with the MREC. We recommend that the designers do not use the MBPW and the MLVPC. When referring to water distribution systems of small size, it is possible to use the equation of Bresse, as long as it is used with a proper value for its coefficient k. For HDPE, we propose k = 1.17 or k = 1.18. For PVC DEFOFO and GFRP, we suggest the range of 1.19 to 1.23 and 1.29 to 1.32, respectively. Regarding the water distribution systems of bigger dimensions, we recommend the use of MREC as the methodology for the economic pipe diameter determination, due to the impossibility of finding an appropriate value for the Bresse’s equation coefficient.

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“…The calculation of the dimensioning of diameters in systems in distribution water is a problem involving a friction factor which is treated in [7]. This diameter in addition to meeting the needs of the system, it should also have the lowest annual cost of installation and operation.…”