Cured in Place Pipe Underground No-Dig pipeline rehabilitation for - - PowerPoint PPT Presentation

Cured in Place Pipe – Underground No-Dig pipeline rehabilitation for pressure pipe application – A fully structural approach

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Why CIPP?

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Burst water main Collapsed Sewer Collapsed sewer collector Collapsed sewer

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Dig and replace

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Rehabilitate

Green Solutions

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PLC controlling of the entire process important

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Other Trenchless Technologies

• Technology
• The old pipe will be cleaned and calibrated
• Controll via TV-inspection
• Welding of the new pipes
• Pull in of the new pipe by a winder
• Applications
• For almost all host materials
• DN 80 – 1000 mm
• Pros
• Factory manufactured plastic pipe, Costs at the lower end
• Cons
• Substantial reduction in cross sectional area of the new pipe
• Annulare gap between host pipe and new pipe at Sliplining
• Requires a big pit excavation
• Bends restrictions
• Requires exact calibration of the host pipe
• Large space requirements as entire length of the pipe has to

be laid out on the ground

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• Technology
• Usage of a reforming pipe

reduction of diameter high elasticity

• The Close Fit liner is moved into the old pipe through existing

chamber or through a small trench

• Reforming of the Close Fit Liner with temperature (and

pressure)

• The new pipe is pressed exactly on the inner wall of the old

pipe and take on the function of the old pipe

• Applications
• Drinking water, gas, industrial, oil, and sewage pipes
• Diameter DN 100 – 400 mm
• Pros
• Little reduction in cross-sectional area (wall thickness of the

pipe)

• Minimal digging
• No welding on site
• Cons
• Depends exactly on calibration of host pipe, not flexible in

host pipe diameter

• Limited diameter range
• Bends restrictions
• Material comparatively expensive
• Sourcing in remote countries, coils are large in DN, difficult

and expensive to transport

• Inflexible in diameter changes

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Assessment and Liner Design

Classification according to AWWA M28 – Good tool to categorise existing technologies

Non-structural Semi-Structural Fully Structural Liner Charatceristics according to AWWA Internal Coating Internal Lining Lining with load bearing Bears full loads Class 1 Class 2 Class 3 Class 4 Internal corrosion protection Yes es Yes es Yes es Yes es Hole and gap span at MAOP No No Yes es Yes es Yes es Inherent ringstiffness No No No No Yes es Yes es PN Lnier > MAOP No No No No No No Yes es Liner survives host pipe failure No No No No No No Yes es

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