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PIPE & PUMPING DESIGNS

PIPE MATERIALS FOR SEWERS AND PUMPING MAINS

The following pipe materials are generally considered for the construction of gravity sewers.

  1. Stone ware,
  2. Concrete (reinforced and pre-stressed),
  3. Cast Iron (CI),
  4. Ductile Iron (DI),
  5. Asbestos Cement (AC),
  6. Unplasticised polyvinyl chloride (uPVC), and
  7. High density polyethylene (HDPE) pipes.

Some of the materials like stone ware, cast iron and concrete, have been used in sewage pipe lines for centuries while others such as DI, PVC, HDPE and AC have only been in use for the past few years.

The following materials of pipes are generally available for the sewage pumping mains.

  1.  Cast Iron (CI),
  2.  Ductile Iron (DI),
  3.  Pre-stressed concrete (PSC),
  4.  Mild Steel (MS),
  5.  High density polyethylene (HDPE), and
  6.  Glass fibre reinforced plastic (GRP).

The appropriate choice of pipe material would make a remarkable contribution to the performance of the sewerage system. A sewerage system involves a series of sewer conduits linked up for the conveyance of sewage from residential, commercial, and industrial areas. The sewage is transported under gravity to a sewage treatment plant (STP) for treatment before final disposal. Consequently, resistance to internal pressure is seldom required, only resistance to buckling due to over burden load and thus less expensive piping materials, such as clay (stoneware pipes), concrete, plastic, etc., are used rather than iron and steel.

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