Colón-Díaz, Carlos T.

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Water hammer analysis of Villalba-Coamo potable water transmission line
(2009) Colón-Díaz, Carlos T.; Rivera-Santos, Jorge; College of Engineering; Segarra García, Rafael; Silva Araya, Walter; Department of Civil Engineering; Portela, Genock
The hydraulic behavior of a new potable water transmission line that flows from Villalba to Coamo was analyzed using computer modeling. The modeling considered steady-state and transient simulations. All the input data in the hydraulic models were obtained from the design drawings, designers, and manufacturer’s suppliers. A steadystate model was created in the EPANET program from which the initial hydraulic grade line was obtained and used in the TRANSAM program. This model was run in a steadystate condition to adjust the hydraulic grade line and to establish the initial conditions for the transient analysis. The simulations under transient conditions considered the gradual closure of a butterfly valve in the high pressure zone of the system, which is believed is the most critical scenario during its operation. The valve closing simulation created high and low pressure oscillations greater than the maximum pipeline design pressure rating as manufactured and created system cavitations. This change in flow regime, known as water hammer, was controlled and dissipated using combination air release and vacuum valves, pressure relief valves, and establishing a slow closing procedure for the butterfly valve.