SSI has designed hundreds of kilometres of pipelines for conveying domestic sewage and industrial effluent. Conventional gravity sewers and outfalls range from ND 110 mm reticulation to greater than ND 1,5m, in all materials from PVC for domestic sewers to HDPE, reinforced concrete and steel for larger diameters. The firm also has experience with “small bore” systems that convey septic tank effluent by partial pressure or vacuum systems.
Specialist structural design services for pipe bridges (e.g. river crossings) and flumes for flow measurement etc are catered for in-house.
Pumped wastewater systems include all aspects of pumpstation design, including optimisation of pumpstation layouts and lifecycle costs, ease of operation and full compliance with all relevant Health & Safety regulations. Mechanical and electrical engineering expertise is sourced in-house to provide clients with a “one-stop” service.
Legal requirements for planned maintenance of municipal infrastructure (e.g. sewers) are catered for by using advanced CCTV techniques which can be used in GIS-based systems, and SSI has experience in the rehabilitation of sewerage systems using trenchless technologies.
Our scope of expertise in the area of wastewater systems includes:
Gravity sewer reticulation
Trunk and outfall sewers
Vacuum sewerage systems
Wastewater pump stations
Trenchless technology
CCTV inspection & verification and GIS interfacing
Rehabilitation of buried effluent pipes
PROJECTS
Umlaas trunk outfall sewer for eThekwiniMunicipality (Durban) (Winner - SAICE Technical Excellence, 2005)
As a result of the rapid development of low income group residential housing in the greater Welbedagt and Dassenhoek areas, eThekwini Municipality needed to provide bulk sewerage infrastructure to service the densely populated areas. An ND 800 sewer incorporating three major bridges to withstand 1:100 year floods was required, and SSI provided integral pedestrian access into the bridge designs to allow safe community passage across the Umlaas River for the first time.
Pipe bridge across the Umlaas River – permitting safe pedestrian access across the river for the first time.
