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Stone Ware pipes (SW) High Density Polythylene(HDPE) Reinforced Concrete (RC)
  • SW pipe are produced from a known inert material ,clay fired to verification state to last for 100 years with proven performance.
  • HDPE pipes are produced from an unproven material, synthetic rubber with an unknown history.
  • RC Pipes are produced from a corrosive material,cement.Rehabitating and relining of concrete sewers have been a severe and on going claims on an economy.
  • SW pipe production is environmentally friendly.
  • HDPE Pipes can be degraded by high concentrations of certain chemicals, such as solvents over long contact times.
  • RC pipes are subjected to H2SCorrosion. H2s is a common acid in sewer.In liners are required.
  • SW Pipes are resistant to H2s attack, unlike RC.
  • HDPE pipes expose to flames when they come into contact with gasoline or other flammable substances in a sewerage system.
  • RC pipes are subject to most acid attack due to their alkali nature.
  • SW pipes are more resistant to chemical corrosion, and are suitable for trade waste discharge, unlike plastics.
  • HDPE pipes can be treated with fire- retardant material only at a higher cost.
  • RC pipes are more costly with plastic or coal tar-epoxy-sand linings.
  • SW pipes are more resistant to abrasion than RC.
  • HDPE pipes are susceptible to deflection, deformation and damage from heavy impact loads.
  • RC pipes are less abrasion resistant than SW.
  • SW pipes are more not degradable by UV radiation, unlike plastic without carbon black.
  • HDPE pipes can be distorted in ho weather, i.e. ovalisation, bending along with the length, or decreases in length after backfilling which causes damage or displacement at joints.
  • RC pipes have lower beam strength than SW.
  • SW pipes have no significant cariation in dimensions or shape with temperature variation.
  • Sidefill support is required to prevent excessive pipe flexure. Bedding requirements of HDPE pipes are more stringent than for rigid pipes.
  • RC pipes are less resistant to impact damage.
  • Installation requirements are less stringent than flexible pipes. Less imported granular material is needed.
  • Installation is time consuming and of higher costs as HDPE pipes are totally reliant on correct bedding and installation.
  • Mechanical lifting equipment is required to mobilize pipes.
  • Jointing procedure's is relatively simple, unlike skid joints.
  • Site supervision is required at all times to ensure proper installation procedures are carried out.
  • Installation can be time consuming using mortar - cement joint. Site testing and backfilling cannot be effected immediately.
  • Performance is not affected by any disturbance of pipe side support, unlike flexible pipes.
  • HDPE pipes can not be used where future adjacent work may affect or disturb the pipe side support.
  • Rigid joints with RC pipes are liable to crack easily following ground movement.
  • SW pipe is not buoyant like plastic pipe, therefore is not likely to move off line and grade due to water in the trench.
 
  • Installation cannot be effected in wet weather conditions.