Corfit DWC ( Double Wall Corrugated ) Pipes are manufactured using HDPE polymer. These pipes are resistant to various types of gases & chemicals which are generated due to putrification of various ingredients flowing in the system. Corfit DWC* Pipes are manufactured as per IS 16098 (Part-2), have a smooth internal surface and corrugated external surface. The corrugated external surface provides greater stiffness, withstands soil movement & takes higher loads (static & dynamic), whereas the internal surface helps in smooth flow of sewerage. Corfit DWC* Pipes are available in SN 4 and SN 8 stiffness classes with sizes from 100 mm to 1,000 mm ID. These pipes have a standard length of 6 metre and are available with rubber ring jointings.


Size (mm)ID (mm)Socket Length (mm)


ParametersDWC (HDPE Double-wall Corrugated) PipesRCC Pipes
Length of pipes available6.0 m2.0 - 2.5 m
Pipe diameters available100 - 1000 mm150 - 600 mm
Pipe material propertyFlexible pipeRigid pipe
Pipe design (structural
Due to its flexibility it allows deformation in diameter as well as in joints under external load and soil natural movement and hence operates years after years without affecting the environmentDue to its rigid nature it could not deform and hence gets damaged under external load or leaks due to natural soil movement at joint. Sewer water could also leach in ground water harming the environment
Pipe jointingSocket & Spigot joint with elastomeric sealing ring1. Coller joint with help of cement morter
2. Socket & Spigot joint with rubber ring and cement morter
Pipe weightVery lightHeavy (19-20 times heavy than DWC* pipes
Pipe roughness coefficient0.009 Much higher flow rate due to less roughness coefficient and hence during design, pipe diameter requirement is less as compared to concrete & DI pipes0.014 Lesser flow rate due to more roughness coefficient and hence during designing, pipe diameter requirement will be higher than DWC* pipe
Handling of pipeEasy due to its light weightDifficult due to its heavy weight
Corrosion resistanceHighly corrosion resistanceNot resistant to Hydrogen Sulfide gas which is present in all sewer pipes, hence Sulphate resistant cement is used during manufacture
InstallationGood flexibility, low requirements for foundation base for laying, good bendingHigh rigidity, high requirement for foundation base for laying, not easy to handle & bend, difficult to connect with other pipe
Pipe classStiffness class SN 4, SN 8 (Non-Internal Pressure Applications)NP 1, NP 2, NP 3, NP 4 (Non-Internal Pressure Applications)
Pipe stacking on siteStacked on plain ground. Smaller diameter pipes can be nested in bigger diameter pipesStacked on plain ground seperately. Can not be nested due to its heavy weight
Pipe handling on fieldLight weight hence safe in manual handling, has high impact resistance and is non-breakable due to miss handlingHeavy weight hence poor safety during handling, may lead to damage due to mishandling
Working featuresHigh safety under buried installationLow safety under burried installation
Life timeMore than 50 yearsAround 15-20 years

Jointing Method

Process: Solvent Joint

    1.Use nylon sling or cushioned cable while unloading from vehicle and while shifting with the help of unloading equipments / devices

    2.While lifting, the nylon sling / cushioned wire should be wrapped on center 1/3rd portion of the pipe


    1.At the site, a storage area should be set aside to keep DWC* Pipes

    2.Stock the pipes by alternating the direction of the pipe lengths so that the pipe sockets are not stacked on / against each other

    3.Storage area should be flat, free of large rocks, rough surface and debris


    1.A flat bodied vehicle is ideal for transporting pipes

    2.Layer of pipes with integral socket should be placed with socket protruding alternately

    3.While stacking pipes ensure that higher diameter pipes are placed at the bottom

    4.Use nylon sling / cushioned cable while loading in trucks, unloading from trucks, shifting and lowering in trenches at site

    5.While lifting a pipe, the nylon sling / cushioned wire should be wrapped on center 1/3rd portion of pipe


    1.Do not drop, drag or bump against other pipes or objects during loading, unloading, shifting and jointing

    2.Do not nest smaller diameter pipes in larger diameter pipes if they can’t be removed easily


    1.The stockpiled height of pipe stacks should not be more than 2.5 metres

    2.Onsite storage area should not obstruct construction traffic


    1.Pipes should not overhang / hang outside the vehicle body

    2.Maximum height while loading should not exceed 2.5 metres

Installation and Commissioning

  1. Clean the surface of the spigot socket using a cloth
  2. Insert the rubber ring on the spigot end in between two corrugation valleys
  3. Insert the spigot end into the socket end of pipe
  4. Connect the jointing jack which is in two halves on DWC* pipe corrugation on socketed end and spigot end of pipe
  5. Insert the rubber ring fitted spigot end of pipe inside the socket with ease with the help of jointing jack
  6. Jointing can be completed within few minutes which is a leak-proof joint


  1. The material for initial backfill envelope should be as per the structural design of flexible buried conduit
  2. It can be the same material that were removed during excavation or it can be fine sand / course sand / gravel depending on the ver burden and superimposed load, but it should be the concrete which invariably induces undesired rigidity in the system
  3. The remaining portion of backfilling shall be the material that were removed during excavation
  4. These materials shall consist of clean earth and shall be from large clod or stone above 75 mm, ashes, refuse and other injurious materials
  5. Backfilling should start only after ensuring the water tightness test of joints for the concerned sewer segments. However, partial filling may be done the joints open
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