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Clay Pipes

JDP offer a comprehensive range of vitrified clay pipe for underground drainage.

A fully socketed system is offered from DN150 to DN600 with an extensive range of pipes and fittings, including bends, junctions and tapers. In addition a range from DN100 to DN300 with an extensive range of fittings, including traps and access items, particularly suitable for building drainage applications is available in our Commercial, Public and Industrial Buildings Product Specifier.

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 60-70°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.

Standards

Clayware

Vitrified clay pipes and fittings manufactured in accordance with the requirements of BS EN 295-1.

Joints

Flexible mechanical joints with polyester fairings and elastomeric "O" ring seals provide watertight joint assemblies, complying with BS EN 295-1: Systems D and N.

Standard Sealing Rings

These are manufactured from elastomers conforming to the performance requirements of BS EN 681-1. EPDM seals are supplied as standard; Nitrile rings are also available for use in contaminated ground or where mineral oil may be present in discharges.

Joint Performance

Clay joint assemblies meet all the requirements of BS EN 295-1. They accept angular deflection and shear resistance without leakage, when tested under an internal or external water pressure of 50 kPa (5 metres head).

Pipe

Size (mm) Standard Length Code Rocker Length Code
150 1.4m 170311178 0.6m 170310009
225 1.75m 170310086 0.6m 170310021
300 1.6m 170310036 0.6m 170310036
375 2.0m 170310048 0.6m 170310038
400 2.0m 170310051 0.6m 170310045
450 2.0m 170310060 0.6m 170310053
500 2.0m 170310066 0.6m 170310062
600 1.85m 170310037 0.6m 170310052
Stoppers
Size (mm) Code
150 170312201
225 170312202
300 170312204
375 170312205
Sockets
Size (mm) Code
150 170313276
225 170313277
375 170313278

Bends

Size (mm) 90° 45° 22.5° 11.25°
150 170312002 170312011 170312020 170312030
225 170312004 170312013 170312022 170312032
300 170312006 170312015 170312024 170312034
375 170312007 170312016 170312025 170312035
400 170312008 170312017 170312026 170312036
450 170312009 170312018 170312027 170312037
500 170312243 170312250 170312028 170312245
Junctions
Size (mm) Oblique 45° Curved Square 90°
150 x 100 170312046 170312105
150 x 150 170312047 170312106
225 x 100 170312051 170312108
225 x 150 170312052 170312109
225 x 225 170312053 170312110
300 x 150 170312058 170312112
300 x 225 170312059 170312113
300 x 300 170312060 170312253
375 x 150 170312062 170312116
375 x 225 170312064 170312117
375 x 300 170312065 170312118
375 x 375 170312066 170312119
400 x 150 170312068 170312120
400 x 225 170312069 -
400 x 300 170312070 -
400 x 400 170312071 170312242
450 x 150 170312073 170312122
450 x 225 170312074 170312123
450 x 300 170312075 170312124
450 x 375 170312076 170312125
450 x 450 170312077 170312126
500 x 150 170312078 170312244
500 x 225 - 170312249
500 x 300 - 170312248
500 x 375 - -
500 x 400 - -
500 x 450 - -
500 x 500 - -
Rest Bend
Size (mm) Code
150 170312039
225 170312040
300 170312042
Taper
Size (mm) Code
150 - 225 170312210
225 - 300 170312211
300 - 375 170312212
Tumbling Bay (90°)
Size (mm) Code
150 x 150 170312173
225 x 225 170312177
300 x 300 170312181
375 x 375 170312184
400 x 400 170312186
450 x 450 170312188
Saddles
Size (mm) Main Pipe Oblique 45° Square 90°
150 Med up to 400 170313216 170313253
150 Large over 400 170313218 170313255
225 Med up to 400 170313223 170313260
225 Large over 400 170313225 170313262

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

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 2bar 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

Installation

  1. Thoroughly clean the polyester fairings. If necessary fairings should be washed with soapy water and dried.
  2. Check that the rubber sealing ring is clean and locate it in the groove of the polyester spigot fairing, ensuring that the ring is not twisted.
  3. Lubricate the polyester socket fairing, including the chamfered ‘lead-in’ using appropriate lubricant. Lubricant should not be applied directly to any portion of the spigot fairing or rubber sealing ring.
  4. Insert the spigot end of the pipe to be jointed into the lubricated socket. This initial insertion should be at an angle of approximately 10° to the main pipeline.
  5. Apply a horizontal forward pressure on the pipe to ensure that the innermost portion of the angled spigot is hard against the socket internal shoulder.
  6. Maintain the horizontal forward pressure and straighten the pipe to the centre-line of the pipeline, in one movement, to complete the joint assembly. If difficulties are encountered the pipe should be removed, cleaned and re-lubricated, and the procedure repeated.
  7. For large and/or heavy pipes (eg DN300 and above) the main weight of the pipes should be supported by mechanical means. The actual jointing of the pipes should then be carried out manually by push fitting the pipes into the sockets using the technique outlined above.