Relining is also called the "no-dig" or "trenchless" procedure which employs a cured-in-place pipe. This pipe is seamless; made of polyester, fiberglass cloth, or some other known material suitable for resin impregnation by pulling it into the damaged pipe.
Drain Relining is usually done from an upstream access point i.e. manhole or excavation. It can also be done from a downstream access point, but that usually involves a certain amount of risk of damage. This trenchless process involves little or no digging. The liner can be inverted using air or water pressure and it can be generated using pressure vessels, scaffolds, or a chip unit. Hot air, UV light, or steam can be used to cure the resin and make it tight-fitting, without joints and corrosion resistant replacement pipe.
Several laterals are restored internally which can be sealed with additional seals in lateral connections or T-liner. An annular space exists between the new pipe and the old pipe and can be sealed by gasket sealing technology.
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