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Introduction to Pressure Pipe Rehabilitation with CIPP


Academic year: 2021

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Introduction to Pressure Pipe

Rehabilitation with CIPP



• Founded in early 1990’s RS Technik is a global leader in the rehabilitation of

underground pipes

• RS Technik uses Cured-in-Place (CIPP) technology to repair damaged or

deteriorated pipes

• RS Technik serves clients around the globe with

support locations in

Germany, Switzerland, the United States and Singapore


RS Technik

• Over 32 million lineal feet of pipe rehabilitated worldwide • DOW high‐performance epoxies are a key 

component of RS Technik’s unique CIPP technology

– Formation of a global commercial alliance with Dow Epoxy Systems in June, 2009

• Dedicated to the development and commercialization of rehabilitation systems and materials in the water and wastewater market

• Quality, optimization and innovation are top priorities in the delivery of technology and materials


RS Systems Technology

Mobile wet-out

Installation with water

column or air inversion

Curing with water or


100% flexibility on the

job site

Full project visibility and



Mobile Wet Out

• Comprehensive fully mobile wet-out system

• All systems on-board:

– Liner

– Resin tanks

– Vacuum system

– Impregnation unit with roller bed

– Computer controlled mixing system

– Climate control materials and work area


Quality Control and Quality Assurance

• Touch screen controlling

of key system aspects

– Resin temperature

– Resin volume

calculations and pump controls for

proportioning, saturation and gap setting

– Data logging

• Owner/Inspector full view advantage


Application Know-How = Process QC




Liner Wet Out

• The lining is laid out on

roller bed or impregnation table

• Vacuum is applied to remove the air from the dry liner

• Resin is pumped into the lining to replace the air removed by vacuum

• Resin injection and

vacuum holes are sealed and patched


Water Inversion and Cure

• As the liner is wet-out, it is

immediately inverted into the host pipe using a water column

• Inversion water is then

circulated and heated through a boiler, which in turn cures the liner in place


Air Inversion and Steam Cure

• After wet-out, the liner is inverted into the pipe

using an air inversion unit (drum or shooter unit)

• Once inversion is complete, controlled

steam is used to elevate the temperature of the air to cure the liner

• Time and energy savings can be realized


RS BlueLine


• Fully structural pipe-within-a-pipe solution for pressure pipe,

• Final product has inherent ring stiffness and full external and internal load bearing capacity, surviving host pipe failure

• Can be designed as partially deteriorated if host pipe condition allows

• Designed in accordance with ASTM F1216

• 4” – 40” diameter

• Class III and IV per AWWA M28

• Compatible with all host pipe materials

• Optional Class II application with bonded liner if pipe condition allows


Key Facts

• Polyolefin coating

• Polyester needle felt with a single or multiple glass layer

• Epoxy resin

• Partially and fully deteriorated structural conditions

• Fulfilling criteria for Class III and IV (AWWA M28)

• Intrinsic stiffness

• No dependence on bond to host pipe

• Prevents future leakage and corrosion

• Improves or replaces structural integrity of host pipe

• Diameter range from 4 – 40-inch

Host Pipe 

Impregnated Felt with Glass Layer Coating


Application and Use

• Where to Use?

– Pipe condition not structurally sound

– Leaking and deflected joints

– Any pipe material

– Pipe is failing with frequent bursts

• The Key?

– The liner has a homogenous felt/glass structure, diminishing the impact of imperfections like deflections and bends.


Connection Techniques

Connection Technique Overview


RS BlueLine Pull‐In RS BlueLine Inversion Multi/Joint End‐seal  with Flange Saddle  coupling Multi/Joint End‐seal  with Flange Saddle  coupling 4" X X 6" X X 8" X X 10" X 12" X X 16" X X 20" X X 24" X X 28" X X 32" X X


Connections and Couplings



If the liner needs to be completely independent from the existing pipe and end-seal is used, a new flange can be installed prior to liner installation.

T-connection with saddle coupler






Pressure Pipe Product Classification

Non-Structural Semi-Structural Fully Structural

Liner Characteristics

according to AWWA Cl

Internal Coating Internal Lining Lining with load

bearing Bears full loads ass I Class II Class III Class IV

Internal corrosion

protection Yes Yes Yes Yes

Hole and gap span at

MAOP No Yes Yes Yes

Inherent ring stiffness No No Yes Yes

PN Liner > MAOP No No No Yes

Liner survives host pipe

failure No No No Yes


AWWA M28 Classification

• Bonded Lining Class II • Woven Textile hose with

Epoxy resin

• Sometimes combined with a felt layer

• Loose fit structural Liner Class III and IV • Sliplining with plastic


• Gap between host pipe and new pipe

• Close fit structural Liner Class III and IV

• CIPP, Fold in Form, Rolldown, Swagelining • No gap between host


Structural CIPP Linings – Bonded or Non-bonding?

Tensile load

23,000 psi

4,500 psi

0 psi

Example for a 100 psi working pressure lined pipe

Any Class III or IV CIPP liner bonding onto the host pipe has limited capabilities for internal pressure

resistance, and relies entirely on the structural integrity of the host pipe for its pressure resistance. A bonded liner can never be a fully structural solution because it is not independent of the host pipe.

Peak Stress Point Stress evenly spread Bonded Non-bonding


Comparison of Pressure Resistance


Hydropower Case Study

• Hydropower supply pipe in Italy

• 20” diameter, 1,650 lf with slope > 20%

• Pressure pipe, 70 psi with high static load in longitudinal direction


Potable Water Case Study

4” potable water case rion pipe in Cagliari, Italy with

7 service connections, 1 T-connection


Fire Main Case Study

10” steel pipe, 230 psi working pressure

530 feet total length, through a 90 degree bend, plus

4 connections in 2“ and 4“ to be opened internally


Fire Main Project – Installation Equipment

Computer controlled mixing and impregnation equipment

Pressure drum installation and steam equipment


Fire Main Project - Installation

Difficult truck position – 3 bends before pipe access


Fire Main Project – Before and After

Before cleaning After cleaning After lining The 90° bend


Green and Energy Efficient

No styrene



No excavation

No landfill materials

50-year design life

Low energy demand


Sustainable Solutions for Aging and

Deteriorating Pipe

• Minimize traffic, trenching and disruption or damage to adjacent infrastructure and environment

• Extend the service life of infrastructure

• High performing, durable epoxy resins

• Technically proven processes

• Professional contractor performing installation consistently and reliably



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