Ovoid concrete pipes are produced and tested in accordance with the relevant provisions of BS EN1916:2002/BS5911-1:2002 including dimensional tolerances, crushing, hydrostatic, water absorption and joint tests.

The ovoid pipe has better velocity characteristics at low flows than equivalent circular pipes, which provides:
  • Lower operating costs, where some sewers may be laid without the need for pumping.
  • Better self cleansing and therefore less risk of siltation and blockage.
  • Reduced costs of trench excavation resulting from shallower gradients.
  • The 600×900 & 800×1200 ovoid pipes are supplied with two lift anchors cast in the top for use with ‘Flexilift’ lifting/jointing system.
  • ‘C’ hook available for lifting/jointing 400×600 ovoids.
  • Lifting/jointing equipment can be supplied on request.
  • Short lengths of either spigot/socket butt pipes can be supplied for building into the manhole wall for the 600×900 and 800×1200 ovoids and are 1250mm long and 625mm long for the 400×600 pipe.
  • Junctions can be fitted and can be made from drainage material other than concrete.
ovoid-pipes-table
Click image to enlarge
Cross section of ovoid pipe 600 x 900 and 800 x1200
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Cross section of ovoid pipe (400×600)

External dimensions – barrel 770 socket 840

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Ovoid pipe 400×600
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Standard form 1 ovoid

(400mm x 600mm R= 200mm)

(600mm x 900mm R=300mm)

(800mm x 1200mm R=400mm)

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C’ hook for lifting and joining
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For sales into England and Wales please call 01179 814500 or email sales@cpm-group.com

For sales into Scotland please call 01698 386922 or email scotland@cpm-group.com

 

Click on the images below to view the image gallery.

  • Are there any precautions to take for concrete pipes laid to steep gradients?

    It is recommended that anchor blocks be cast into the ground every 3 or 4 pipe joints behind the socket (also consider installing packers on the face of sockets to prevent concrete to concrete contact).

  • How frequent should I be testing the pipeline during installation?

    It is highly recommended to test the pipeline every 3 or 4 pipes laid as an absolute minimum (do not wait until whole line is installed before carrying out such test).

  • What are the appropriate ‘roughness values’ for concrete pipes?

    Roughness values are:

    Foul sewers: 1.5mm.

    Surface water sewers: 0.6mm.

  • What are the recommended minimum depths of cover for concrete pipes?

    Minimum depth of cover to top of pipes is 0.6m with bedding class S (360o granular bedding). For cover depths less than 0.6m, then the pipeline should be protected with either a full concrete surround, or a reinforced concrete slab should be placed over it (spanning sufficient distance onto trench walls).

  • What concrete pipes are generally reinforced?

    CPM concrete pipes are generally reinforced in sizes DN675 and above (it is possible to reinforce some of the smaller sizes and also to provide un-reinforced pipes in some of the larger sizes – usually made to order).

  • What is the maximum permissible velocity in concrete pipes?

    Limits are not normally placed on maximum velocities but certain criteria such as the potential for erosion should be considered for steep gradients.

  • What is the maximum working pressure that concrete pipes can withstand?

    Concrete pipes are designed to operate at low heads of water. The BS performance requirement is set at a minimum of 0.5 bar.

  • What is the most likely cause of air test failure for a concrete pipeline on site?

    Common causes of air tests failures include:

    • Displaced seals (usually due to use of wrong pipe lubrication during installation).
    • Poor laying technique.
    • Faulty testing equipment.
    • Poor seal between testing equipment and face of concrete pipe.

Got a question?

To find out more about Ovoid Pipes, please call our Sales Team or fill out the enquiry form and we’ll get back to you within 24 hours.

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