Standard installation direct design

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This can be changed at any time via the Cookies link at the bottom of the page. Accept all Reject all Configure. The four ISO systems Standards, ISO cover plastic pipes in renovation of gravity sewerage, pressure sewerage, water and gas supply respectively.

Each requires that an installation manual be provided by the installer of the plastic pipe. Clause 9. It also requires that the installer carry out the works with a competent well trained team conversant with the installation manual.

All of the following parameters which are applicable should be provided:. The manual should include tolerances on certain parameters because they may be subject to change if the host pipe diameter assumptions are not accurate, or the insertion temperature is different from the assumption made.

For concentric reduction methods this means choosing a liner diameter in excess of the largest assumed host internal diameter, and providing a range of reduction options to accommodate the smallest assumed host internal diameter.

For folded methods it means choosing the liner diameter smaller than the smallest assumed host internal diameter in order that full reversion can take place. The running diameter and the running load should be provided for each reduction option.