Al Nahr Engineering Limited

1-The  Man-made River Project

The  Man-made River Project (MRP) is one of the largest engineering projects of this century.  Our company has been involved in the Engineering and Project Management of this mega project since its inceptition. The  Man-made River Project has been designed and implmented in four systems. Each system represents a separate major project.

ANE's staff have been intimately involved in the Engineering and Project Management of the following Systems of  MRP:

• Sarir-Sirt/Tazerbo-Benghazi System

• Hasouna-Jeffara System

• Al Gardabiya-Assdada System

• Ghadames-Zwara-Azzawiyah Water System

Sarir-Sirt/Tazerbo-Benghazi System

The Sarir-Sirt/Tazerbo-Benghazi System,Phase I of the Man-made River Project (MRP), is designed to supply 2 million cubic metres of water per day by gravity flow from wellfields at Sarir and Tazerbo in the south of Libya to the cities on the coast.  The water flows via two direct buried conveyance pipelines fed from wellfields at Sarir and Tazerbo.  The overall length of the conveyance pipelines is approximately 1,600 km comprised of 4 metre diameter pre-stressed concrete cylinder pipe (PCCP). The length of each pipe is 7.5 metres and the weight approximately 86 tons per pipe.

In addition to the conveyance pipeline referred to above the System also includes
very large embankment reservoirs of total capacity of  50 million cubic meters.
There are also 5 Operations Support and Maintenance (OS&M) facilities,
a 90MW gas turbine power station and permanent control and communication facilities. Corrosion protection measures were provided throughout the Project. There are a total of 234 deep tube water supply wells. Two large PCCP production plants  capable  of producing 220 pipes per day were constructed to meet the pipe manufacturing needs of this system and the other systems of the MRP.

Hasouna-Jeffara System

The Hasouna-Jeffara System, Phase II of the  Man-made River Project (MMRP), is designed to supply 2.5 million cubic metres of water per day from wellfields at Jabal Hasouna to the Jeffara Plain and to Tripoli on the coast. The water flows  through pre-stressed concrete cylinder pipe of 4 metre diameter of approximately 86 tons weight per pipe under pressures reaching to 26 bar. The overall length of the conveyance pipelines is approximately 1,275 km. The total number of wells is 476 deep tube water supply wells.

In addition to the conveyance pipeline referred to above the System also includes, pumps and flow control stations and Operations Support and Maintenance (OS&M) facilities at East Jabal Hasouna, North East Jabal Hasouna, Ash Shwayrif and Assdada and a Headquarters Building with a Central Control Room and a further OS&M at Bin Gashir near Tripoli. Permanent control and communication facilities and corrosion protection measures were provided throughout the Project.

This phase of the  Man-made River Project was implemented in a very  difficult environment. The pipeline routes through highlands, mountains, valleys and rocky lands and all these have been accommodated during the design stage. All anticipated problems were considered in the design stage where safe, secure and cost-effective methods were adopted to achieve the design service life specified.

Al Gardabiya-Assdada System

The Al Gardabiya-Assdada System, Phase III of the Man-made River Project (MMRP), is designed to connect the Phase I System to the Phase II System allowing 0.98 million cubic metres  per day of water to be transferred between the two systems in either direction. The water flows  through pre-stressed concrete cylinder pipe of 4 metre. This System includes large pump stations at Al Gardabiya and  Assdada with a capacity of  31 megawatts protected by Surge Vessels. The Capacity of the regulating tank at  Wadi Wishkah is 82,000  cubic metre. A permanent control and communication system is also  provided throughout the Project.

Ghadames-Zwara-Azzawiyah System

The Ghadames-Zwara-Azzawiyah Water System, Phase IV of the  Man-made River Project (MRP), is designed to supply 250,000 cubic metres of water per day from  wellfields at Ghadames to the Zwara City in the coast. The total number of wells are 106 deep tube water supply wells.

The overall length of the conveyance pipelines is approximately 620 km of 1.6 metre diameter pipe. There are three main line pump stations (PS1, PS2 and PS3) each with 20,000 m³ forebay tank. A further pump station (PS4) is installed on the Haraba branch line with a 70,000 m³ regulating tank. This System also includes three reservoirs of total capacity of 60,000 cubic metres.

At Nalut there is a flow control station with a 70,000 m³ tank and at Azrair a pressure control station.  Permanent control and communication facilities including SCADA are provided throughout the Project.  There are four main Operation Support and Maintenance facilities (OS&M) provided which include living and infrastructure facilities.

Grand Omar El-Mukhtar Reservoir

This is a circular rock fill embankment reservoir of 24 million cubic metres capacity located to the south of Benghazi with a water depth of 27 metre and diameter of 1164 metre. The total amount of excavation at the floor and the body of the reservoir is 8,100,000 cubic meters and the filling  of the reservoir is 5,500,000 cubic meters. The asphaltic lining has a surface area of 2,240,000 square meters.

Grand Al Gardabiya Reservoir

This is a circular rock fill embankment reservoir of (15.4) million cubic metres capacity located near Sirt with a water depth of 16 metre and diameter of 1180 metre. The total amount of  concrete used for  the reservoir is 25,000 cubic meters.

Tarhunah-Abu Ziyyan Project (TAZ)

The Tarhunah-Abu Ziyyan Project (TAZ) is designed to supply 800,000 thousand cubic metres of water per day from the regulating tank at Tarhunah to the 300,000m³ concrete Abu Ziyyan storage reservoir. The Project includes conveyance of 1.6m to 2.8m diameter prestressed concrete cylinder pipe (PCCP) with an overall length of 106 km terminating in a steel pipeline connection rise of 500m to the top of the escarpment. There are also two pump stations, break pressure tank and 6 major turnouts.

Al Kufra-Tazerbo Water Supply Project

The Al Kufra Wellfield-Tazerbo-Ajdabiya Water Supply Project (Kufra Scheme) is a major scheme will provide an additional 1.68 million cubic metres per day (MCMD) of water supply into the Man-made River Project (MMRP) and increase the hydraulic capacity of the existing conveyance systems in order to convey this additional flow.  The Kufra System includes a new wellfield, lift pump station, major operations support and maintenance facility (OS&M), 380km of conveyance pipeline and associated structures, and seven booster pump stations on the existing conveyance pipelines.

ANE has been awarded a Contract for the Technical Review, Supervision, engineering and Project Management of the Project including:

•  Al Kufra Lift Pump Station

•  Sarir-Sirt Line Booster Pump Station

•  Sirt 2 Booster Pump Station

•  Al Kufra Forebay Tank

•  Modifications to Existing Conveyance Systems

•  Kufra Surge Feed Tank

•  Fitting-out the Kufra Conveyance Regulators and Flow Control Stations

•  Permanent Control and Communications Systems

•  Wellfield Lateral and Collector Pipework

•  Wellfield Balancing Tank

•  Wellfield Flow Control Station •  Wellfield Power Supplies

•  Operations Support and Maintenance Facilities

5 Tanks Project

ANE is the Consultant Engineer for the construction of 5 concrete agricultural water storage tanks, including pipework and valve chambers being constructed for the Man-made River Water Utilisation Authority (MMRWUA) to the south of Tripoli.  Each tank has a capacity of 86,000 cubic metres.  A further 4 No. tanks (for a total of 9) will be included in the final Contract scope.

ANE’s scope includes review and approval of Contractor engineering/designs and procurement and construction submittals, supervision at site of the construction works executed by Contractors and the testing and commissioning of the completed works.

Dafnia-Naema and Tameena-Al Karareem Agricultural Projects

The two Projects combined include some 260kms of ductile iron distribution piping ranging in diameter from 1200mm to 90mm and a further 79km of uPVC pipelines with diameters of 90-180mm, 40 concrete storage tanks and a fibre optic control system.

ANE has been awarded the Construction Supervision Services Contracts for these Projects  by the Client, MMRWUA.  ANE’s scope includes the review and approval on behalf of the Client of Contractor designs, procurement and construction submittals and the supervision of the construction works by the Contractor.

In addition to engineering review and construction supervision the services by ANE also include Contract Management Services, Project Management Quality Control, Management of Materials and Equipment Procurement by the Contractor, Testing and Operation and Maintenance and Training of the Client’s personnel.C

Ajdabiya-Tobruk Conveyance

Ajdabiya-Tobruk pipeline route is to transport part of the Man-made River Project of Phase I water to the area from Ajdabiya City up  to Emsaed City. The project includes pipeline and appurtenant structures such as valves, inspection chambers and turn-outs for the areas and communities near the route, four (4) large pump stations, eight (8) large water storage reservoirs, each with an appropriate capacity in addition to three (3) Administrative to support the operation and maintenance of the systems shared out by the areas of Ajdabiya, Elmkheeli and Tobruk. The length of the pipeline is about 1,000 KM divided into one main route starting from Ajdabiya holding reservoir and secondary routes. The project aims at pumping 1,100,000 CM of water per day to such areas which includes Albeida, Marej, Derna, Alqubba and neighboring areas, Altameemi, Om arrazam, Ain Alghazala and the area of Tobruk up to Emsaed.

2- Other Projects

Design of Gas Pipeline - Zueitina - Benghazi

Zueitina-Benghazi Gas Pipeline Project supplies consumers with natural gas via a gas pipeline of 140km.  The Project scope of work included:

• Determining preliminary route
• Optimisation of alignment
• Establishing connections to existing installations
• Detailed mapping of corridor of interest for proposed alignment
• Prepaing plan and profile drawings for use in construction
• Advise Client on geotechnical conditions
• Train Client’s personnel in all aspects of the work to transfer technology

 

Design of Railway Route - Tripoli International Airport - Bin Gashir

The company has re-designed the route of the railway between Tripoli International Airport
and Ben Gashir Road. The project scope of  work  included:

• Carrying out survey and topographic works
• Re-designing  railway route
• Preparing  plan and profile drawings
• Carrying out  preliminary design works for the bridges
• Preparing  specification of soil investigation and identifying location of boreholes
• Reviewing locations of culverts in  previous design

Disi- Amman Conveyance System

The Disi-Mudawwara to Amman water conveyance is designed to alleviate the chronic shortage of water in Amman, Jordan by conveying 100 million cubic metres of water per year from 55 wells in the Disi aquifer in the south of Jordan adjacent to the Saudi Arabian border through a 1600mm diameter steel conveyance pipeline 325 km to new and existing reservoirs in Amman.

The company's re-design and optimisation of the system has resulted in considerable saving in capital cost ( approximately 100 million dollars)  to the Client (The Ministry of Water and Irrigation -  Jordan) by a reduction in major structures, optimisation of the conveyance route, reduction in scope from two separate wellfields to one wellfield and other significant savings. Engineering Consultancy services were  provided  to the Client through all pre-contract stages of the project, which was awarded to a contractor on a Build, Operate and Transfer (BOT) basis.

Infrastructure - General  Utilities Authority

The Company has  provided engineering consultancy services to the Client for  the provision of supplying water to several cities and locations. The Company's scope of work includes collecting and evaluating data and the preparation of engineering studies for preliminary  and detailed design. The projects covered water supply to many locations and cities around Libya.

The New Highway Project ( Ras Ejdyer - Emssad)

The new Highway Project is designed to provide an international standard expressway (motorway) along the North coast of Libya from Ras Ejdyer in Tunisia to Emssad in Egypt. Al Nahr Engineering Limited (ANE) has been awarded the contract for the detail design of the highway section from Ras Ejdyer on the Tunisian border westward to Al Marj, with a spur to Benghazi, a total length of approximately 1,300 kilometres of high standard expressway. ANE's scope of work for the Project includes the following three main stages:

1. Studies and Route Selection Stage

This includes gathering Project-related information and drawings, an inspection of the highway route to define the terrain and types and allocation of industrial, structural and residential facilities, plantations, farms and services located along the route.

2. Preliminary Design Stage

This includes the detail survey along the entire Highway either by photogrammetric survey or by ground survey, preparation of traffic count studies, review of available geological and geotechnical investigation reports, development of geotechnical design parameters for embankments and foundation soil for structures, preparation of plan and profile drawings showing the proposed horizontal and vertical alignment with an emergency lane, preparation of typical sections and pavement designs, preparation of preliminary drawings for culverts, bridges, inter-sections, interchanges and traffic safety features.

3. Final Design and Project Deliverable Documents

Preparation of final design drawings and specifications and also the final bidding documents, including Bills of Quantities, for issue to international contractors.  The stage includes:

•  Preparation of final design drawings showing details of horizontal and vertical curves, the points which define the alignments of the roa

d, the elevations of the road and its structural works, interchanges, bridges, protection measures, culverts, drainage, signage and road markings.

•  Preparation of all drawings showing the location of quarries, usable lands and the source of water supply points required for road construction.

•  Final detailed calculations for hydrological and geological study.

•  Structural details for culverts, retaining walls and bridges.

•  Technical reports and specifications of the entire road and Bill of Quantities for each section of the Highway.

•  Detailed designs for service areas, parking areas, toll plazas and emergency facilities.

•  The final design and bidding documents including Quantities and technical specifications for issue to pre-qualified bidders.