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AWWOA Water Week Conference 2019
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Thursday, November 14 • 2:45pm - 3:15pm
Session C - Relining Critical Water Mains in the City of Calgary

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Problem Statement:
Traditional thermoplastic materials provide an established low pressure technology for pipeline applications offering enhanced corrosion resistance over traditional rigid metallic pipes. Despite the advantages of flexibility and corrosion resistance, applications of thermoplastic pipes are limited by pressure capacity.

Motivation:
The development of aramid-reinforced flexible plastic pipes opens up new fields of applications in renewal of high-pressure lines carrying water. These pipes make it possible to achieve maximum operating pressures of 900psi in the diameter range of 150 to 500 mm.
This innovative pipe lining system can be installed with lengths up to two kilometres in one single pull – including through bends.

Approach:
Para-aramid was invented and first marketed by DuPont in the early seventies.
It is used as reinforcement in a variety of engineering applications – ranging from car tyres to ropes and cables, from pressure hoses for turbo motors to ballistic protection.
Aramid is a product that combines properties like high tenacity with low weight.
These properties of this high grade material make it possible to construct a flexible lining system for high demands in the water field.

Results:
Aramid-reinforced flexible pipes are a new innovative re-lining system based on an aramid-fabric. The strength of the fabric allows bursting pressures of over 1000psi even with a wall thickness of six to eight millimetres.
The aramid-fabric is coated on the outside with wear-resistant polyethylene and on the inside with modified plastics suitable for the regarded medium.
The flexible pipes are available in nominal widths from 150 up to 500 mm. The system is certified for the renewal of pipes in the water field with an operating pressure of higher than 700psi.

Conclusion:
The relining with aramid-reinforced flexible pipes is a simple, efficient and self-supporting pipe replacement system. The plastic pipeline is installed by a draw winch using the existing pipe route. The old pipe is only used as a sleeve to withstand the soil pressure.
The system offers the unique combination of the benefits of a trenchless technology (minimising excavation works, maintenance of pipelines in difficult terrain) with the advantage of classical pipeline construction (new pressure pipework offering a maximum of service life and safety).
The connection of the flexible plastic pipe to steel, cast, PE or other pipe materials is enabled with specially designed couplings.

Other consideration:
1. Ability to negotiate four 45 degree bends with a radius of 3 x D in one installation section.
2. Since the area is difficult to access and traditional open trench methods are expensive and time consuming
3. CSA / NSF 61 Standard for potable water certificate
4. INTRODUCTION TO CALGARY’S WATER DISTRIBUTION SYSTEM
5. CALGARYS WATER SYSTEM HAS OF OVER 5000KM OF PIPES
6. COMMONLY USED MATERIAL CAST IRON, DUCTILE IRON AND PVC TO RELINE
7. PROBLEM PIPES WERE INDENTIFIED AND RELINED
8. NOSE CREEK/ HORTON ROAD /SHAGANAPPI / MAPLEGLADE
9. SIPHONS / CREEK CROSSINGS / HIGHWAY CROSSINGS / INTERSECTIONS
10. CATHODIC PROTECTION
11. SLIP LINING

Speakers

Thursday November 14, 2019 2:45pm - 3:15pm
Double Tree by Hilton 16615 109th Avenue North West, Edmonton, Alberta,

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