JDP offer a comprehensive range of EN1401-1 underground drainage pipe and fittings from 82 to160mm diameter with plain ended pipes and separate push-fit couplings or socketed pipes and fittings for use in housing drainage.
Pipes and fittings / underground drainage ranges are manufactured from unplasticised polyvinyl chloride (PVC-U). Gullies are manufactured from PVC-U, polypropylene (PP) or polyethylene (PE). Couplings can contain a rubber sealing ring manufactured from styrene butadiene rubber (SBR).
The Europe-wide manufacturing standard BS EN 1401-1: 1998 replaced BS 5481 in 1999.
WIS 4-35-01 is the UK specification for thermoplastic structured wall pipes for gravity sewer applications. Water Industry engineers and consultants can be confident that by specifying
sewer pipes to WIS 4-35-01 the materials used will meet the stringent performance levels for adoptable sewers laid down by the UK Water Companies and Scottish Regional Water Authorities.
The specification, which was developed by Water UK in conjunction with participating members of the BPF Pipes Group, BSI, BBA and WRc, follows extensive research and
investigation and sets out a comprehensive range of performance based tests including long term structural performance, joint integrity under extreme loading conditions and, resistance to potential damage from sewer cleaning and maintenance practices.
Sewer Drain & Ultrarib
Suitable joint lubricant should be used for joining socketed pipe and fittings as recommended by manufacturers and supplied by JDP.
The surround used for back fill should extend to the trench width in normal trench situations. The external loads (backfill and surcharge) imposed on a pipe of rigid material, (such as vitrified clay, concrete, asbestos
cement or cast iron) are supported mainly (sometimes wholly) by the resistance of the pipe to circumferential bending. On the other hand unplasticized PVC pipes, being relatively flexible, offer less
resistance to circumferential deformation and rely partly on external support to resist deformation. Therefore, it is of primary importance for unplasticized PVC pipes that fill material, particularly the bedding
and side fill, should be properly compacted in order to prevent excessive deformation.
It is desirable that vertical deformation should be limited to 5% on completion of the backfilling, which can only be achieved by proper compaction of the backfill (Please refer to Codes of Practice BS5955 and
It is essential to avoid high stress concentrations and sharp objects such as large stones or flints which should not be allowed to come into contact with the surface of the pipe.
The flexible nature of unplasticized PVC pipes helps them to accommodate deformations resulting from
ground movement or from other differential settlement under normal circumstances.