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The Naylor DENSLEEVE underground drainage system of DN100, 150, 225 and 300 (200 and 250 for Continental Markets) plain-end vitrified clay pipes and fittings with flexible sleeve couplings, was developed for building drainage and associated sewerage and is manufactured to comply with the stringent requirements of BS EN295.
Structural Performance
Densleeve pipes can usually be laid directly on a hand trimmed natural trench bottom with selected, excavated materials (Class D Bedding) used as backfill.
Clayware
Vitrified clay plain-end pipes and fittings, manufactured in accordance with the requirements of BS EN295-1
Sleeve Couplings are manufactured in high impact polypropylene with elastomeric seals providing watertight, flexible mechanical joint assemblies, complying with BS EN295-1: System G.
Standard Coupling Seals are manufactured from elastomers conforming to the performance requirements of BS EN681-1.
It is a major advantage of the Densleeve system that the plain-end pipes can be quickly and easily cut to intermediate lengths on site and can still be jointed using the flexible couplings. This feature retains the ease in jointing, reduces wastage and damage and is particularly cost effective.
Originally developed in DN100 and DN150 specifically for "Round the Building" drainage, the range now includes DN225 and DN300 pipes and fittings for sewerage and road drainage applications, plus DN200 and DN250 developed for Continental European Markets.
The flexible joints ensure that the pipeline will accommodate minor settlement and ground movement - without failure. Vitrified clay pipes and fittings are rigid and do not distort under loading. Their high inherent strength ensures stability under even the highest loadings.
Pipe Lengths and Delivery
Naylor pipes are supplied in easy-to-handle lengths. They are delivered in convenient packs with optional mechanical offloading equipment available on the delivery vehicle.
Range - UK
Pipe Nominal
Size (DN) |
Standard Length
(metres) |
Number
(per pack) |
Approx Weight
(tonnes per pack) |
| 100 |
1.5 |
79 |
1.25 |
| 150 |
1.25 |
41 |
1.25 |
| 225 |
1.75 |
20 |
1.45 |
| 300 |
1.75 |
12 |
1.75 |
Range - Continental Sizes
Pipe Nominal
Size (DN) |
Standard Length
(metres) |
Number
(per pack) |
Approx Weight
(tonnes per pack) |
| 100 |
1.5 |
79 |
1.43 |
| 150 |
1.5 |
41 |
1.36 |
| 200 |
1.75 |
24 |
1.35 |
250 |
1.75 |
12/16 |
1.84 |
| 300 |
1.75 |
12/15 |
1.78 |
An extensive range of fittings is also available, including bends, junctions, tapers and access items.
Densleeve can be used in conjunction other Naylor underground and with other above-ground systems. Connections are made by using purpose made connectors and adaptors or by the use of Band-Seal couplings.
Availability - UK
Densleeve is available either directly from the manufacturer, from Naylor stocking depots or from hundreds of Merchant Stockists throughout Britain - contact Naylor Sales Department for details.
Availability - Overseas
Naylor drainage products are exported throughout the world. Pipes are suitably packed or crated and delivery can be by containers as well as by conventional shipping services. Stocks are held by Agents or distributors in several countries - contact the Naylor Export Department for details or visit our Marketing page.
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