Concrete Rigid Pipe (Class N Bedding) Plastic Flexible Pipe with full granular surround (Class S Bedding) For further details on the materials cost calculator visit the CPSA website www.concretepipes.co.uk/calculators/material-cost Potential savings of up to £174.94 per linear metre* *Figure quoted is the difference between Class S (Plastic Flexible Pipe) and Class N (Concrete Rigid Pipe) costs, based on a DN1800 pipe. Potential cost savings are based on normal ground conditions, including granular bedding costs of £15 per tonne and cost of material being taken off-site to landfill at £6 per...

360° Granular bedding and surround / Bedding factor = 2.2 Lay, joint and bed pipes as for Class B. Place sidefills and densely compact the layers using the same bedding material at each side, up to crown level, taking care not to displace the pipes. This is followed by 300mm of the same granular bedding material but lightly compacted directly over the pipe, after which ordinary backfilling is commenced. Class S Bedding Costs Full pipe granular surround cost per metre for: DN1800 £225.29 / DN1500 £173.63 / DN1350 £140.62 / DN1200 £110.95 DN1050 £88.52 / DN900 £68.49 / DN1800 Plastic £221.20 Normal...

Below we have listed eight industry specifications and guidance references justifying the use of bedding classes for rigid pipes with a lower bedding factor than Class S BS EN 1295-1: 1997 (incorporating corrigenda May 2006, July 2008, February 2010 and March 2010). Structural design of buried pipelines under various conditions of loading. Part 1: General requirements 2 or 4kN/m2 and this is significantly lower than the minimum recommended stiffness of 10kN/m2 if Class B bedding is to be considered. In other words, all standard stiffness flexible plastic pipes will generally require Class S embedment,...

Water Industry Information & Guidance Note IGN 4-08-01 February 1994. Issue 4 Section 4. Selection of suitable bedding and sidefill materials Where the structural performance of the pipeline does not depend on the sidefill, (e.g. for some rigid pipe installations), sidefill may contain stones up to 37.5mm and clay lumps up to 75mm for any pipe diameter. For rigid pipes larger than DN 500, stone sizes up to 10% of the pipe diameter will normally be acceptable. Sewers for Adoption 6th edition (SfA6) / Sewers for adoption 7th edition (SfA7) / Civil Engineering Specification for the Water Industry...

Design Manual For Roads And Bridges Volume 4 Section 2 Part 5 HA40/01 2.1 Design Considerations. Range of bedding types Methods of bedding pipes are shown in the Highway Construction Details, drawing F1 (see below) for carrier drains and F2 for filter drains (see Appendix B). These different beddings provide varying degrees of support to the pipe. In the case of filter drains, the granular bedding and surround additionally functions as a filter medium. Not all possibilities that would give a satisfactory bedding are included in the HCD, THE CHOICE HAS BEEN RESTRICTED TO SAVE GRANULAR MATERIAL...

Building Regulations Approved Document HBedding and backfilling 2.41 The choice of bedding and backfilling depends on the depth at which the pipes are to be laid and the size and strength of the pipes. 2.42 Rigid pipes - The types of bedding and backfilling which should be used for rigid pipes of standard strength laid in a trench of any width are shown in Diagram 10. 2.43 Flexible pipes - THESE WILL BECOME DEFORMED UNDER LOAD AND REQUIRE SUPPORT TO LIMIT THE DEFORMATION. The bedding and backfilling should be as shown in Diagram 10. Class D: Bedding factor 1.1 High standard ol workmanship required...

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