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Material Cost Calculator
This calculator is designed to help you estimate the material cost (bedding, infill material and pipes) for installation pipes using different bedding designs. The calculator compares four classes of bedding for rigid concrete pipes and the single bedding class usually used for flexible (plastic) pipes. |
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About Bedding Classes
The load bearing capacity of an installed pipeline relates directly to the construction of the bedding which is intended to level out any irregularities in the formation, and provide uniform support around and along the length of the pipe barrel. The strength of an installed pipeline depends on a combination of the strength of pipe and the class of bedding. The selection of the bedding class is influenced by many factors, which include the nature of the ground, the loads acting on the pipeline in the trench, the strength of the pipe, and the local cost and availability of the bedding material.
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In situations where imported granular material is expensive and where supervision of site work cannot be guaranteed, it is preferable to specify a lower class of bedding with a higer pipe strength. This is the main reason why material costs for installing concrete and plastic pipes are different. Class B is based on 180⁰ granular bedding with selected backfill material; Class S requires full 360⁰ granular bedding and therefore costs more (additional costs of bedding material with more Aggregates Levy paid per metre run of pipe laid, costs of excavated material transported from site, etc.)
The cost breakdown is calculated per metre run of pipe. To use the calculator you will need the following information:
- Size/ internal diameter (DN) of the pipe
- Cost of pipe (per metre run) – including gaskets, connectors etc. If not integral to pipe
- Cost of material transported from site and disposal to landfill (per tonne)
- Unit cost of bedding used (per tonne).
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