Sliplining is completed by installing a smaller, carrier pipe into a larger host pipe, grouting the annular space between the two pipes, and sealing the ends. The trenchless method is generally a cost-effective rehabilitation method to replace water and sewer force mains.
Sliplining is one of the oldest forms of trenchless technology. The most common material used to slipline an existing pipe is high-density polyethylene (HDPE). Continuous sliplining uses HDPE pipe that is fused into long lengths prior to installation. The HDPE pipe is pulled through the existing host pipe starting at an insertion pit and continuing to a receiving pit. Long installation distances of up to 5,000 feet are possible.
Potential limitations are the new pipe will generally have a reduced cross sectional area due to installing a smaller sized pipe, thus reducing flow rates and capacity. Hydraulic calculations need to be considered.For pipeline projects that need to maximize final Internal Diameter, CompressionFit HDPE pipe lining can add value over sliplining.
Increased Flow Rates Over Slip Lining
Tight fitting HDPE provides maximum Internal Diameter delivering greatest flow
Smooth wall of HDPE (150 c-factor) reduces friction and pumping costs
o grouting is required due to compressive tight fit of new HDPE
Production rates of up to 5,000 feet in a single pull
91% less excavation than open cut
Solution to the Problem
Fully structural HDPE can be installed if the host pipe has no integrity
Semi-structural HDPE can be installed if the host pipe has some integrity, yet increase strength, span holes and provide corrosion protection
Thin walled HDPE can be installed if the host pipe is sound, but joints are leaking or corrosion protection is required
Existing Utility Path Followed
No available easement? We won't need one
Design hours reduced as utility relocates are irrelevant