Nejeni Construction and Project Management (Pty) Ltd

Kleinvlei

Construction of pressure management installations
Location Kleinvlei, Blackheath and surrounds, Western Cape
Scope Of Work Construction of pressure management installations
Schedule 2012/2013

Project Detail

General Information

The study areas of Kleinvlei, Blackheath and surrounds currently experience very high pressures largely due to their topography. Frequent pipe bursts have been reported in the area as well as a significant amount of unaccounted for water lost through leakage. Tender number 150Q/2012/13 for the pressure management of Kleinvlei, Blackheath and surrounding areas was advertised on 26/10/2012 and awarded to Nejeni Construction and Project Management. The tender allowed for the installation of seven pressure reducing valves (PRVs) to manage the specified area. A preliminary study and design had been included with the tender (with proposed locations of the seven PRVs) but allowed the contractors to use their digression in the relocation of the PRVs as well as which zones to pressure manage within the study area.

The ground elevation within the study area varies between 75 meters (at The Conifers) and 15 meters (at Electric City). With the area being fed from the so-called 110 system (a series of bulk reservoirs with top water lever of 110 meters above sea level) the static pressures then vary between 34 meters and 95 meters.

Statistical Information

Zone

Pipelength (m)

Area (ha)

AADD

AADD_NRW

Units

Meters

Stands

1

17 695

297

445

723

880

701

914

11

59

14

22 270

217

1 019

1 660

1 792

1 473

1 818

17

66 610

379

3 049

4 965

5 827

5 439

5 833

18

18 410

153

848

1 381

1 505

1 451

1 607

22

13 020

119

576

939

1 248

1 303

1 414

Actual Installations

The Works

The contract involved the construction of pressure management installations at the following locations:

Highgate

  • Hindle Road and Saxdown Road

Nuwebegin

  • London Way and Eesriv Way

Tuscany Glen / Hillcrest Heights

  • Tuscany Glen Way and Hindle Road
  • Eesrive Way

Forest Village / Electric City

  • Forst Road

Kleinvlei

  • Van Riebeeck Road

Dennemere

  • Albert Philander Road

Happy Valley

  • Wimbledon Road and School Road
Zone PRV Location Supply Main PRV Size

Nominal

Material

OD

Tee (inlet)

Tee (outlet)

PRV supply

Current

Future

Highgate Hindle / Saxdown

300

150

250

Nuwebegin London / Eesriv

200

150

200

Tuscany Glen / Hillcrest Heights Tuscany Glen / Hindle

250

150

200

Tuscany Glen / Hillcrest Heights Eesriv

300

100

200

Forest Village / Electric City Forest

250

150

200

Kleinvlei Van Riebeeck

300

200

250

Dennemere Albert Philander

250

150

250

Happy Valley Wimbledon / School

200

100

150

Schematic