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PVC Industry News from Think Pipes Think PVC

Trenchless Construction Options - Pipe Bursting

Trenchless Construction Options - Pipe Bursting

The diameter of pipe being burst typically ranges from DN50 to DN375, although pipes of larger diameters can be burst. Pipe bursting is commonly performed size-forsize or one size upsize above the diameter of the existing pipe. Larger upsize (up to three pipe sizes) has been
successful, but the larger the pipe upsizing, the greater the force required to burst the existing pipe and to pull the new pipe and the greater the potential for ground movement (upheave) and damage to other nearby pipelines.

This is another rehabilitation method of replacing both pressure and gravity lines with new pipe and involves the breaking of an existing pipeline by brittle fracture, using mechanically applied force from within. While the deteriorated pipe fragments are forced into the surrounding ground, a new pipe of the same or larger diameter is pulled in to replace the original pipe. Pipe  bursting is performed by the insertion of a conically shapedbursting head, into a deteriorated pipe and causing it to shatter by pneumatic or hydraulic action.

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Trenchless Construction Options - Horizontal Directional Drilling

Trenchless Construction Options - Horizontal Directional Drilling

Horizontal directional drilling (HDD) is the most commonly used trenchless process for installing water pipe.

Traditionally these applications were reserved for only roadway and river crossings. Today, HDD is
employed for a myriad of other applications where the benefits of trenchless installation can be derived.

In recent years, developments in the precision of HDD machinery, specifically the ability to monitor and steer the
pilot bore with high levels of accuracy that maintain line and grade, has also enabled the installation of gravity
sewer pipes.

HDD is performed with a drilling rig and involves three essential steps. First a pilot bore is created, covering the
distance over which the pipe is to be installed. Highly sophisticated electronics enable the drilling rods to be
carefully guided and its direction of travel to be monitored. Reamers are then pulled back to obtain a diameter
large enough to accommodate the diameter of the pipe. Simultaneously, drilling mud is pumped into the bore
to stabilise the boring and to prevent soil collapse. In the final step, the new pipe to be installed is pulled back
through the bore.

The greater hydraulic capacity of PVC pipes potentially allows a smaller hole to be drilled, allowing savings
in drilling time and cost. PVC’s higher strength compared to Polyethylene allows longer shot lengths for HDD
installations, with single lengths of over 2km having been achieved.

Restraint joint and Fusible PVC pipelines are both ideal for HDD projects

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Top 10 advantages of PVC pipes for trenchless applications

Top 10 advantages of PVC pipes for trenchless applications

PVC pipe is the ideal pipiing material for trenchless water infrastructure projects. Here are 10 advantages of using PVC pipes for trenchless pipelines.

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PVC Pipes trenchless construction options

PVC Pipes trenchless construction options

PVC pipe are a superior choice for trenchless installations in capital improvement projects as well as rehabilitation. PVC pipe is manufactured in sizes compatible with cast and ductile iron pipes, thus facilitating its connection to existing pipelines.

PVC pipes offer installers of trenchless pipelines the widest range of piping options in trenchless technology including Fusible PVC, restraint joint, close fit liners, spiral winding and jacking.

The below table summarises the common trenchless methods, their applications, the reference standard and the corresponding PVC pipe products that are available.

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Face the challenge of sewer and water infrastructure rehabilitation with trenchless PVC Pipelines

Face the challenge of sewer and water infrastructure rehabilitation with trenchless PVC Pipelines

The range of useful properties afforded by PVC pipes makes it the most versatile of all pipe materials, a fact attested to by the variety of applications and markets served by PVC pipes. Trenchless PVC Pipes offer engineers and specifiers the most efficient pipe to move water coupled with overall cost savings thanks to reduced installation costs due to lightweight pipes and reduced overall pipe dimensions.

Minimise pipeline construction disruption
While open-cut installations continue to be the standard method of construction for new projects where access is readily available, for projects in developed urban areas various trenchless technologies are making no dig options more economically viable and appealing. For rehabilitation of our cities aging pipelines, trenchless technologies make it possible to restore the structural integrity and fluid velocity of the pipeline whilst minimising the financial and social costs.

Major cost savings over other pipeline technology - stretch your capital works budget further
PVC pipe is very competitive with when compared to other pipe materials, even more so when installation and life cycle operating costs are taken into consideration. These lower material costs are coupled with lower installation costs because of increased productivity, the product's low weight and cheaper transportation expenses.

Rehabilitate aging pipelines without digging up the entire pipe system
Trenchless technology has the advantage of smaller excavations with the overall installation being completed using pre-drilled holes or by bursting or relining an existing pipeline. Trenchless technology also makes it possible to rehabilitate aging pipelines without digging up the entire pipe system, often restoring both the structural integrity and flow speed of the pipe, thus greatly minimising the social costs associated with the disruption to traffic, pedestrians, businesses and customers.

PVC pipes offer the widest range of options for trenchless projects
The PVC pipe industry has developed solutions for the common types of trenchless installations including Sliplining, Horizontal Directional Drilling (HDD), Pipe Bursting, Tight Fit Structural Liner, Jacking and Microtunnelling. Many of these technologies are well established and have been successfully used for many years.

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Trenchless PVC pipe wins plastics award


At the recent New Zealand Plastics Industry Design Awards, trenchless PVC pipes manufacturer, Iplex Pipelines NZ Ltd was recognised for two local horizontal directional drilling projects using Fusible PVC™ pipe systems. The biennial awards acknowledge and promote excellence in the creation, design, production, manufacture, and marketing of plastic products or components.

One of the trenchless PVC pipeline projects recognised for the award was the Hingaia Peninsula Trunk Sewer Project in Papakura, part of Auckland City. The highlight of the Project was its record-breaking pull of 1,050 m of Fusible PVC™ Pipe, the longest pull back of a single, continuous thermoplastic pipe-string installed via horizontal directional drilling.

Numerous challenges were faced and overcome on the Hingaia project. The superior tensile strength and hydraulic capacity of relatively thin-walled Fusible PVC™ pipe reduced construction risks and provided economic benefits.

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Future Proof Your Pipeline Assets

PVC: Long Life and Durability


PVC pipe’s ultra-smooth surface reduces pumping costs and its leak-free joints eliminate water loss – which can be up to 40 per cent in some old-technology and corrosion-prone piping networks.

PVC pipe’s greatest environmental attribute is perhaps its exceptional durability and corrosion resistance – leading to better water conservation and lower replacement, maintenance and repair costs. PVC’s proven track record supports expectations of a very long service life. PVC has been used for piping since the 1930s1 longer than ductile iron. PVC pipes have a proven performance record of over 50 years in Australia, while overseas studies show the life expectancy of PVC pipes to be over 110 years.TRN Pipe E-guide cover web-0x300454-190x269

PVC pipe is engineered and tested tough. It provides resistance to costly leakage. It offers unmatched corrosion resistance and reliability.

The longevity of PVC pipes means the pipes function more efficiently, reducing maintenance and ongoing work to the pipe, making it more affordable over time.

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Trenchless PVC Pipelines projects set to grow in Australia

While Fusible PVC™ pipes are being increasingly widely being used in trenchless projects in North America and New Zealand, they are yet to be used in Australia. At the recent OzWater 14’ conference held in Brisbane, Iplex Pipelines Australia was logowidely demonstrating the benefits of Fusible PVC™ pipes and its effectiveness for trenchless pipeline projects.logo

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US trenchless PVC Pipeline project demonstrates that with trenchless technology, water utilities can do more with less

Trenchless Technology magazine has recently named a Denver Colorado project as 2013 Water Pipeline Rehabilitation Project of the Year for its use of pipe bursting technology combined with Fusible PVC™ Pipe to replace some 70kilometres of cast iron water pipe. 

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Top 10 Advantages of Trenchless PVC Pipelines VS HDPE

  1. Minimises soil displacement and resulting potential for disturbance to adjacent utilities and surface heave - Drilling the hole and removing and disposing of the soil removed is the most expensive part of trenchless installations. By using Trenchless PVC pipelines, its smaller OD means less soil is required to be removed, reducing drilling and installation time.
  2. Best Solution for Slip lining - Novafuse Fusible PVCTM pipes are potentially the best solution for slip lining, where new PVC pipes are inserted into old pipe systems requiring rehabilitation. Read more on slip lining for Pipelines
  3. More than TWICE the long term tensile strength and safe pulling stress of HDPE - Significantly longer continuous pipelines can be installed using trenchless PVC pipelines compared to any other material, increasing the potential scope of projects planning on using trenchless technology to install new pipelines.
  4. Simplifies maintenance and fittings inventory by having standard fittings and tapping’s
  5. Ease of future maintenance by utility crews as PVC pipes are the easiest to maintain
  6. Greater pull strength and less pipe weight allowing greater material efficiency reducing environmental impact
  7. Fusible PVCTM is easier and faster to install and may be possible to use for installations where HDPE is not suitable
  8. No relaxation period required for reconnection so pipelines can be put into service immediately on connection.
  9. Excellent chemical resistance to hydrocarbon permeation and chlorine induced oxidation over HDPE. PVC has superior resistance to hydrocarbons and water disinfectants than HDPE.
  10. The smaller OD of PVC Pipes allows the use of a smaller expander head when pipe bursting, reducing the force required to break the original pipe and insert the new pipeline and allowing a faster installation. For any given OD, PVC will always have a larger ID, thus greater hydraulic capacity than HDPE
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NEW TECHNICAL PAPER - PVC Pipes for Trenchless Projects

Think Pipes Think PVC has put together Australia's most comprehensive guide about PVC Pipe Trenchless Installation.

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First Fusible PVC Pipeline in Local Region near Auckland

With the assistance of Iplex fusible PVC pipe, a New Zealand distance record for a continuous directionally drilled shot has been was set.

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World's longest Trenchless PVC Project a Success

It’s a real testament of forward thinking councils and government bodies who are recognising the benefits of trenchless pipelines project over slower and potentially more costly trenched pipelines.

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