The North-South carrier (NSC) is an extensive bulk water transfer scheme conveying raw water from surface water resources located in the north of Botswana, near Francistown to the capital city of Gaborone in the south over a distance of approximately 360 km.

The second phase of the scheme (NSC-2) involves a new pipeline, parallel to the existing system which is being implemented in phases. Since 2011, members of C2D have been providing specialist inputs to various different design teams on the following project phases:

• NSC2.1 – 1200 ND, 80 km long steel pipeline between Moralane and Palapye,
• Dikgatlhong Dam Project - 1200 ND, 74 km long steel pipeline between Dikgatlhong Dam and Moralane,
• NSC-1 Upgrade Works – Analysis of the 1200 ND and 1400 ND existing system,
• NSC-1 Upgrade Works, GRP Replacement - 1400 ND GRP Replacement project
• NSC 2.2 Transfer Project – 1200 ND 250 km pipeline between Palapye and Mmamashia
Services included the detailed hydraulic and surge analysis of the respective systems, development of operating and control philosophies, pump and valve selection and specification, system optimisation, validation and condition assessment of numerous valve chambers and associated fittings on the NSC 1 scheme. 

The Nottingham Pump Station and related infrastructure was originally constructed in 1983 and upgraded in 2003. The system consists of a pump station abstracting water from the Orange River and two DN 1500 rising mains discharging into a canal which transfers the water over a distance of approximately 24 km to augment the Vaal River. The Northern Cape is an arid region. The system is therefore of strategic importance to support the vast irrigation scheme as well as domestic water supply to the town of Douglas. The reliable operation of the system is regarded as a critical lifeline to both the agriculture industry, as well as the town and inhabitants of Douglas and surrounding areas in this arid part of the country.

C2D Engineering have been the consulting engineers on various projects on this vast scheme:
• Replacement of a section of one of the DN 1500 rising mains. The construction was completed under challenging site conditions during a 4 week shutdown.
• Installation of a sacrificial anode cathodic protection system.
• Installation of internal seals on the remaining sections on the DN 1500 rising main and internal repair lining repairs where required.
• Installation of a tenth pump set within the Nottingham Pump Station in order to improve reliability and redundancy
• Lining and coating refurbishment of the Nottingham Pump Station suction and delivery manifolds
• Installation of a 2.5 ton overhead crane within the Nottingham Pump Station 

C2D Engineering have been involved with multiple projects relating to the bulk raw and potable water supply to Exxaro’s Grootegeluk Mine and Surrounding areas. The projects include:
• The upgrading of the Grootegeluk Main Water Pipeline at the Exxaro Grootegeluk Complex. The 5.7 km long, DN 600 steel pipeline was constructed in the 1980’s and supplies raw water to the mining operations from a connection to the Mokolo Dam supply system.
• Implementation of a long term internal corrosion coupon study to assess the remain life of the Grootegeluk Main Water Pipeline.
• Refurbishment of a 10.1 km long section of existing DN 600 steel pipeline in order to convert the pipeline from a raw water pipeline to a potable pipeline whilst extending it’s useful life. The refurbishment included the re-lining of the pipeline with cement mortar lining, installation of new valve chambers and the integration of the cathodic protection system with the existing systems.
• Installation of 6 km of new DN 600 steel pipeline complete with valve chambers and cathodic protection and AC mitigation.
• Monitoring and maintain the Grootegeluk Main Water Pipelines’ and the MCWAP-1 Pipeline’s cathodic protection and AC mitigation systems.  

C2D were appointed to assess the condition of the Dap Naude Dam to Polokwane pipeline for Aurecon and the City of Polokwane Municipality. The pipeline transfers raw water and is a 55km long steel pipe with diameters ranging from DN400 to DN600. The condition assessment tasks included leak detection surveys, drained CCTV surveys, corrosivity surveys, coating integrity surveys, pipe-to-soil potential surveys, stray current surveys, metal loss investigations and engineering assessment to confirm the integrity of the pipeline assets. 

The Project consisted of the Construction of Installation of approximately 2.1 km DN 900 steel bulk water pipeline to provide potable water to Cosmo City X20 to X28. Project includes connection to existing bulk water infrastructure, termination at the bulk reticulation network, air valve chambers, a scour valve chamber, integration into the existing impressed current cathodic protection system and a waste water treatment works. 

The Boston Hydropower Project is a 5MW run of river system on the Ash River in South Africa with a design flow of 40 m³/s at a net head of 14 m. The scheme consists of a 10 m high weir, intake, a 300 m long conveyance and power station housing a single horizontal compact axial turbine. C2D Engineering are appointed as the EPCM Consultant on the Project. Construction commenced in September 2023.