Greater Beirut Water Supply Project - Transient Analysis
The project includes the construction of a 20 km long headrace tunnel and 10 km of adduction pipes in order to exploit water of the Litani and Awali rivers for domestic use. The water is drawn from a hydro power plant, located in Joun at about 30 km apart from South Beirut, and conveyed to the Hadath and Hazmieh tanks, under design on the city uplands.
The scope of the work was to analyze the overall transient response of the hydraulic system, which includes mass oscillation and waterhammer phenomena. Calculations were made with the software PIPE 2016 Surge for the transient analysis.
The following scenarios have been investigated:
- Control operation (Gradual start up and gradual shut down);
- Emergency cases (burst scenario in different configurations);
- Extreme events (shut down at the same time of the Flow Control valves
FCV) in the final reservoirs and total close of the Flow Isolation Valves (FIV)
in case of fault in the Distribution Chambers stretch).
The transient analysis for the Tender Design lead to the conclusion that the design of the hydraulic system needs to be adapted and optimized in order to ensure acceptable responses for all critical transient scenarios.
The solutions proposed consisted of:
- Change the detection system of fault;
- Split the system in the adduction pipes (independence of the two pipes);
- Increase the dimension of OIP (Ouardaniye Inlet Portal);
- Install feeder tanks in KOP (one for each pipe);
- Install air valves downstream of the FIVs in KOP and upstream of the check
valves and BV located at HCC (Hazmieh Connection Chamber).
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