Water supply | project study
Borouge 3LPE system eases Botswana’s water supplies
PHOTO: SAUMIL PARMAR
A 75km polyethylene-coated steel pipeline linking Botswana’s Dikgatlhong reservoir into the main water distribution network was completed earlier this year as part of a major investment programme planned by the country’s Department of Water Affairs. Water is a critical resource in Botswana, where
growth in the agricultural and mining industries is reducing groundwater supplies. The Dikgatlhong dam project was initiated by the Botswana government to alleviate the impact this groundwater reduction is having in the country. The project called for the construction of a 4.6km long and 41m high zoned earth-fi ll embank- ment dam several kilometres below the confl uence of the Tati and Shashi rivers in the north-east of the country close to the border with South Africa. Construction of the dam took four years and was
completed earlier this year. It was built by China’s Sinohydro Corporation, with the project managed by Bergstan Gauff Jeffares & Green (a joint venture between Gauff of Germany and the South African companies Bergstan and Jeffares & Green). At full capacity the reservoir will store 400 million m3
and will become Botswana’s largest, considerably exceeding the capacity of the 141 million m3
A major project designed to improve water supplies in Botswana relies on a 75km long steel pipe line coated using Borouge’s latest black bimodal PE topcoat
water infrastructure, carrying water over a distance of 360km from the Letsibogo Dam on the Moutloutse River to the capital city of Gaborone. According to Jeffares & Green, the Dikgatlhong
of water Gaborone
reservoir which currently holds fi rst place. A 75km long 1.2m diameter steel pipeline links the
Dikgatlhong project into the existing North South Carrier Pipeline. This is a key element in Botswana’s
project will provide an additional 3,000 litres/s of water into the North South Carrier Pipeline system, which is also due to be upgraded in the near future. It is also intended to supply water to the local population and for an extension of the Moropule power station, located near the city of Palapye. The 75km steel pipeline is coated with a three-layer PE (3LPE) system supplied by Borouge, a joint venture between Borealis of Austria and the Abu Dhabi National Oil Company (ADNOC). According to the company, steel water pipelines have traditionally been protected using coal tar/bitumen coatings, cement, or tape wrapping. However, a growing number of projects are now
Botswana’s Dikgatlhong reservoir is the largest in the country and supplies the city of Gaborone
November 2012 | PIPELINE COATING 21
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