Great Man Made River Project Libya
Outfalls
Great Man Made River Project Libya
From 1,000 wells deep in the Sahara desert, fresh water is piped to the coastal cities of Tripoli, Sirt and Benghazi through Prestressed Concrete Cylinder Pipe.
The Great Man Made River brings water to Jamahiriya’s coastal region for irrigation, industry and domestic use.
Phase I and II of the project required 3000km of mainly 4m diameter Prestressed concrete Cylinder Pipe to complete the Eastern and Western systems and a further 180km of 4m diameter PCCP completed the link between the two systems. The Ghadames project used 368km of 1600mm diameter PCCP and the Kufra project, currently under construction, will require 380km of 4m diameter pipe. All this pipe comes from the Brega and Sarir plants, the largest PCCP plants in the world, with a combined daily output in excess of 1.5 km of 4m diameter PCCP. Phase III, still under construction, requires a further 180km of 4m PCCP to complete the link between the two systems; the Gardabiya/Assdada Link. PCCP continues to be produced in diameter ranges of 1.6 - 4m with design pressures up to 26 bar at the world’s two largest pipe manufacturing plants located in Brega and Sarir.These plants comprise a total of 5 production lines, each with capacity of up to 44 x 7.5m long x 4m diameter pipes per day.
The plants were designed by Price Brothers in accordance with long established pipe manufacturing practices. They were constructed over a two year period with production commencing in 1986.
Prestressed Concrete Cylinder Pipe was chosen by the Libyan government because of its reliability, low maintenance and lowest overall cost. The plants create a considerable number of local jobs.
PBUK continues to provide consulting services for the pipe and fitting designs, manufacturing, technical supervision, QC, maintenance and a spare parts procurement service for the plant and equipment.
Tarhunah To Abu Ziyyan (Taz) Engineering Review
The TAZ Conveyance Scheme is part of Phase 3 of the Great Man Made River Project in Libya. It is designed to transfer 0.8 Million Cubic Meters per day (MCMD) of water from the end of the Tarhunah to Jefara Plains Extension (TJE) to the Abu Ziyyan end reservoir.
It consists in total of an 82.6km long conveyance comprising some 66km of gravity pipeline and a 16.6km length of pumped main. Turnouts with an average total demand of 0.4 MCMD are located in the gravity line to supply agricultural projects with the remaining 0.4 MCMD, lifted approximately 600m by two pump stations to the end reservoir at Abu Ziyyan.
The minority of the conveyance line is constructed of 2.8m diameter PCCP although some small sections of 2.2m diameter PCCP and 1.6m diameter steel exist.
Kufra Conveyance Engineering Review
The Kufra Conveyance Scheme is part of Phase 3 of the Great Man Made River Project in Libya. It connects a new well field at Al Kufra to the Kufra tie in point on the existing Phase I conveyance from the Tazerbo Wellfield to Sarir. This increases the flow in the Sarir Sirt/Tazerbo-Benghazi (SSTB) system from 1.0 Million Cubic Metres per day (MCMD) to 1.68 MCMD to provide a total flow of 2.68 MCMD. The conveyance is 383km long and constructed of Prestressed Concrete Cylinder Pipe (PCCP) of predominantly 4.0m diameter. Along the conveyance are associated major regulating and flow control structures as well as minor appurtenant structures comprising various chambers for air valves, access and conveyance drain down facilities. The Kufra wellfield and associated lift pump station are excluded from the conveyance scope of work and is designed and constructed by others. The installation contract for the conveyance was secured by the Tekfen-TML Joint Venture of Turkey during 2006.