The objective of the present research was to develop a methodology to determine efficiency tube diameter in impulsion line of pump system for irrigation. This work had some differences compared with similar procedures. The utilization of a function of tubes price for weight unit and for linear meter, also a price function of pump for potential unit and utilization of the universal equation of lost head depend on tube wall with a friction regimen. A final equation to obtain an efficient diameter allowed to stablish relationship among different elements to resolve the problem in a simple way, being necessary an interactive process, but faster as possible to reach a solution for a problem.
optimal diameter; impulsion line; irrigation
