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Hydraulic Surge Mitigation: Modeling a Pump Intake System with a Long Offshore Pipeline
If not properly controlled or mitigated, hydraulic transient events in a long offshore intake system can cause potential damage to various system components with resulting safety concerns. The transient phenomenon discussed in this paper is on the hydraulic surge within a pump intake due to a failure or tripping of onshore intake pump(s), located at the downstream end of a 1.4-km long offshore pipe in a coastal environment. The postulated intake system consists of offshore velocity cap intakes, three 3.0m diameter buried offshore pipes and an on-shore pump intake structure. The design flow rate for the intake system is 51 m3/s. The transient analysis of the system is performed with a proprietary computer program that solves one-dimensional, unsteady flow equations using the method of characteristics. This analysis investigates several measures to mitigate the mass surge, from material selection for the offshore pipe to pump intake structure design. For the offshore portion of the intake system, pre-stressed concrete cylinder pipe (PCCP) and glass-reinforced plastic (GRP) pipe are analyzed. In addition to different pipe materials, various pump intake structure layouts are modeled to optimize the design for mass surge mitigation. The pump intake is modeled with surge tank and air vessel elements to capture atmospheric and pressurized air interactions at various sections in the intake. The analysis shows that the selected pump intake structure with partial cover effectively creates an air pocket to cushion the mass surge, while designed venting allows air to bleed out and prevent excessive pressure build-up.
Hydraulic Surge Mitigation: Modeling a Pump Intake System with a Long Offshore Pipeline
If not properly controlled or mitigated, hydraulic transient events in a long offshore intake system can cause potential damage to various system components with resulting safety concerns. The transient phenomenon discussed in this paper is on the hydraulic surge within a pump intake due to a failure or tripping of onshore intake pump(s), located at the downstream end of a 1.4-km long offshore pipe in a coastal environment. The postulated intake system consists of offshore velocity cap intakes, three 3.0m diameter buried offshore pipes and an on-shore pump intake structure. The design flow rate for the intake system is 51 m3/s. The transient analysis of the system is performed with a proprietary computer program that solves one-dimensional, unsteady flow equations using the method of characteristics. This analysis investigates several measures to mitigate the mass surge, from material selection for the offshore pipe to pump intake structure design. For the offshore portion of the intake system, pre-stressed concrete cylinder pipe (PCCP) and glass-reinforced plastic (GRP) pipe are analyzed. In addition to different pipe materials, various pump intake structure layouts are modeled to optimize the design for mass surge mitigation. The pump intake is modeled with surge tank and air vessel elements to capture atmospheric and pressurized air interactions at various sections in the intake. The analysis shows that the selected pump intake structure with partial cover effectively creates an air pocket to cushion the mass surge, while designed venting allows air to bleed out and prevent excessive pressure build-up.
Hydraulic Surge Mitigation: Modeling a Pump Intake System with a Long Offshore Pipeline
Feldmann, Chester (author) / Turan, Cagri (author) / Zheng, Yifan (author)
World Environmental and Water Resources Congress 2011 ; 2011 ; Palm Springs, California, United States
2011-05-19
Conference paper
Electronic Resource
English
Hydraulic Surge Mitigation: Modeling a Pump Intake System with a Long Offshore Pipeline
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