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Clay Pipes

JDP offers a comprehensive range of vitrified clay pipe for underground drainage; a fully socketed system is offered from DN375 to DN600 in accordance with EN 295-1 System N, with an extensive range of pipes and fittings, including bends, junctions and tapers.

Features & Benefits

  • Extremely durable
  • Quick installation by manual pushfit operation
  • Flexible joints allow for minor settlement
  • Minimum granular bedding required
  • Nitrile seals available for contaminated ground
  • Accommodates controlled discharges up to 75°C

Applications

  • Foul sewerage
  • Surface water
  • Road drainage

Aggressive environments

The standard pipes, polyester fairings and elastomeric sealing rings are resistant to all forms of attack from substances which are commonly encountered in public sewers. Where more aggressive effluents or environments are present, special sealing rings may be required. Alternatively Hathernware clay pipes should be considered. Hathernware is a specialist Chemical Drainage System that covers the most aggressive discharges and extreme conditions, including thermal shock – a phenomenon where extremes of temperature variation can put significant structural strain on a drainage system. Contact us for more information on using clay in aggressive environments.

Standards

Clayware

Vitrified clay pipes and fittings manufactured in accordance with the requirements of BS EN 295-1. Kitemark No. KM 20173.

Joints

All pipes consist of a factory fitted grade 316 stainless steel sleeve a 5 bar rated EPDM self-lubricated seal.

Pipe

  Strength
Nominal Size (mm) Standard Length Crushing Strength FN (kN/m) Class Number Weight (kg/m)
375 2.0m 72 240 75
225 2.0m 48 128 125
300 2.0m 64 160 150
375 2.0m 80 160 235
400 2.0m 96 160 250

Installation

  1. Check the pipes and fittings to ensure that they have suffered no damage, ensuring that the spigot and socket are clean and free of any grit.
  2. Insert the spigot end into the stainless steel sleeve and lower the pipe on to the pipe bedding by the means of a cloth strap around the centre of the pipe. There is no requirement for any lubricant as EPDM seals are self lubricating.
  3. Insert a suitable wooden packer into the stainless steel sleeve and pply an equal mechanical force onto the pipe end. The pipe is fully home in the sleeve when there is a 5mm gap between the sleeve and the pipe rebait.
  4. Test the pipe and joint after installation of every three pipes in accordance with BS EN 195 Cluase 5.18: Air Tightness.

Clay Jacking Pipes

Vitrified clay pipes have been in production for over a 100 years meeting the needs of water borne sewerage systems. JDP offer a modern vitrified clay jacking pipe system that has been developed to meet the requirements of pipe installations by trenchless construction methods.

These systems may be used for a number of methods; Microtunneling (pipe jacking), Guided Auger Boring, Pipe Bursting, Pipe Eating and Slip Lining.

Features & Benefits

Existing networks of utility services are usually found in cities and crowded urban areas, where pipelines in need of replacement or expansion are located below roads and buildings or interwoven with other services. Trenchless Technology greatly reduces the need for surface excavation which in turn minimises traffic congestion and built environment disruption.

Traditional 'Open Cut' installations

This form of Installation is characterised by the high level of physical work that is carried out.

  • Excavation of a trench, removal of spoil, temporary supports
  • Laying and jointing of pipeline on specified bedding material
  • Refilling the trench, compacting fill materials, removal of surplus spoil
  • Restoring the above ground infrastructure

Typically 50 times the amount of spoil that the new pipeline will occupy has to be removed and then refilled again after the pipeline is laid.

As well as being very labour intensive, various skills possibly from several companies and authorities may need to be co-ordinated.

Trenchless Technology Installations

Access using trenchless techniques also requires surface work, but not to the scale of the open trench approach. In comparison trenchless projects are characterised by:-

  • Less indirect costs, because surface access is less disruptive
  • Projects are generally of shorter duration, therefore social and environmental costs are considerably reduced
  • Public awareness of disruption is lessened due to concealment of the works

Trenchless Techniques

Pipe Jacking - spoil and water is removed by pumping as slurry

Guided Auger Boring - spoil is removed by an auger through a steel casing

Pipe Bursting - the existing pipeline is forced into bedding material by means of an expanding hydraulic cone at the head of the replacement pipeline

Pipe Eating - the existing pipeline is ground using a cutting head and fragments are removed by augers through the replacement pipeline

Slip Lining - the replacement pipeline is winched through an existing pipe and the void between old and new is filled with grout

Standards

All pipes and assemblies are manufactured in accordance with:

  • BS EN 295-7 Requirements for vitrified clay pipes and joints for pipe jacking
  • BS EN 12889: 2000 Trenchless construction and testing of drains and sewers

Jacking Pipes

with polypropylene sleeve coupling and moulded-in EPDM rubber seals
Nominal size DN (mm) Effective Length (mm) Approx. Weight Kg/m
150 996 45

Jacking Pipes

with stainless steel sleeve coupling and integral EPDM elastomer sleeve moulding
This joint system is especially beneficial for smaller diameter jacking pipes as the joint system can accommodate better storage extremes.
Nominal size DN (mm) Effective Length (mm) Approx. Weight Kg/m
200 996 60
225 996 80
250 996 100
300 996 120

Jacking Pipes

with stainless steel sleeve, EPDM elastomer seals and factory fitted packing ring
This joint system is capable of achieving a minimum 2 bar internal/external pressure.
Nominal size DN (mm) Effective Length (mm) Approx. Weight Kg/m
400 984/1984 240
450 984/1984 250
500 984/1984 260
525 984/1984 280
600 984/1984 338
700 984/1984 430
800 984/1984 508
900 984/1984 680
1000 984/1984 800
1100 984/1984 967
1200 984/1984 1170

Jacking Pipes

with stainless steel sleeve, EPDM elastomer seals and factory fitted packing ring
These jacking pipes are designed for installation by either the 3-pass guided auger boring or pipe bursting.
Nominal size DN (mm) Effective Length (mm)
400 149
450 202
500 232