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Contractors World 2011 Volume 2 Issue 9
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Water pipeline gets underwayWater pipeline gets underway

Abu Dhabi
Water pipeline gets underway

As the population of Abu Dhabi, in the UAE, approaches 2 million, a new potable water pipeline will meet peak period demand during the summer months.

With a design capacity of 166l/s, the new 32 km pipeline will connect the water pumping station at Mussafah and the Delma Street substation in Abu Dhabi.

The contract for the Mussafah-Abu Dhabi potable water pipeline (Lot M) on the Mussafah Water Transmission Scheme (MWTS) has been awarded to Turkish contractor Aydiner Constructions with a 16 month completion schedule.

The award follows the successful completion of the Shuweihat Water Transmission Scheme, a major initiative combining one of the biggest water pipeline projects undertaken using ductile iron pipes with a desalination plant in the region.

The twin pipeline, carrying 378,000 m³/day, spans 250 km between the Shuweihat desalination plant and Mussafah, carrying water to join the regional supply network serving Sila, Mirfa and Mussafah. The new Lot M contract pipeline features similar ductile iron pipe with a 1.6 m diameter.

Its route traverses salt laden areas with a high water table – requiring extensive dewatering. Initially passing through open desert-type areas, the route also includes densely populated urban areas through the city.

Ground conditions have so far not presented any problems for the contractor but, according to Ömer Ali Aydiner, Chairman of sister company Aydiner Constructions – Abu Dhabi, unrecorded utilities are posing a particular problem.
These include frequent underground electrical lines and water pipelines. The route also runs parallel with a number of oil-related and gas pipelines.

The pipeline will also pass below the Maqtaa creek at a depth of 20 m. In the event of possible failures and ‘common practise’, the pipeline splits into two 730m pipelines below the creek, re-joining into a single pipe; relying on horizontal directional drilling techniques.

Dynapac compactors on the jobDynapac compactors on the job

On being awarded the contract, Turkish contractor Aydiner Constructions placed and order for a Dynapac CC900 compaction roller and six LG160 compaction plates.

Using 45 t and 60 t class Volvo excavators for trench excavation, Aydiner are excavating to depths of up to 5 m but generally 3 m x 3 m depending on the surface gradation.

Two ‘bedding-in’ 30 cm deep base courses are initially prepared prior to laying the ductile pipes and compacted by purpose-ordered Dynapac LG 160 plate compactors.

The pipe is then surrounded with hand-tampered sand layers using approved backfill with no rock content. Above the pipe, the backfill is initially compacted in 30 cm layers to be continued using a recently delivered Dynapac CC900 double drum vibratory roller.

The roller is undertaking up to four static passes to meet the specified degree of compaction. With a drum width of just 900 mm, the roller is ideal for small scale compaction duties.




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