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Terry, here in Germany prices for tubings are about DM 100,-/m for 300mm diameter PVC , 16 bar DM 64,-/m same, 12,5 bar; DM 132,-/m for HDPE 315mm ID, 29mm walls, 12,5 bar. Latter require some shielding as an upper laying when layed in the ditch and buried. The design criteria closely to be watched, among else, are the stiffness of the geometrical shape, dependant on geometry and mechanical properties. Remember it is not so much the cost of the material, but the spent in the manufacturing and development process which determine a products price. For simple stuff, as a rule of thumb approximation you may use the formula " customer price = 4 x materials price. But this only for stuff where there is not that much artisans work involved ( like rewinding coils) Matthias terry michael schrieb: > > I think the only real problem with PVC in some cases is purely political. i.e. PVC is no good for canister lights but for canister scooters it's fine etc. If you look at the chemical properties of each you'll see that each has it's advantages and disadvantages depending on the application. Is it really that much cheaper to use PVC? -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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