March 2017 Vol. 2

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PPN – Latest & Breaking News in Poly Pipes

New Inspection Technology Boost for George Fischer EF Joint Performance (Breaking News)
The value of George Fischer’s widely specified HDPE pipe systems has just been enhanced through the development of the world’s first non-destructive testing (NDT) regime for HDPE products, which now allows the manufacturer to issue a “Fit for Service” certificate on both Electrofusion and butt welds.

Contractors already benefitted from the inclusion of a ‘completion indicator’ on individual couplings such as Tee or Crosses, but the new service now offers complete peace of mind for the whole project team regarding the quality of the finished installation.

This very significant stride forward means that clients in the water, gas distribution, food processing and other industries requiring the highest standards cam now specify systems such eco-FIT, ELGEF Plus and PROGEF with the same confidence as metal pipework alternatives.

Meanwhile customers can continue to benefit from these well engineered systems’ speed of installation, versatility, low weight, durability and other key attributes. Crucially GF Pipe System’s new ultrasonic based, non-invasive testing will see the company’s internationally recognised partner provide a responsive on-site service which can check up to 20-30 separate welds per day.

The Pass/Fail report can include details of any discontinuities detected by the scanners and is accompanied by a 10-year guarantee to provide complete peace of mind for the specifier or their end client.

A spokesperson for George Fischer commented: “At GF Pipe Systems we understand the challenges that customers face during the project cycle, which is why we have developed the NDT solution to fulfil the same quality standard they would expect from any other piping system but with the Pass/Fail fusion long term weld statement. This increases the value of our offering and ensures it is fully Fit-for-Purpose.”

Armtec Adding Production of Large-Diameter HDPE Pipe (Breaking News)

PE100 Pipe Association Publishes Full List of HDPE Pipe and Fitting Standards (Breaking News)

How to Avoid HDPE Pipe Joints Leaking with Minimum Effort! (Breaking News)

Tools to Prevent Weld Failure of HDPE Pipes (Special Feature)
There are many reasons why the wrong tools can attribute to failed welds, including the tools being too bulky, too small, or not covering the size range of the pipe being installed. All tooling used should be fit-for-purpose and capable of doing its job time and time again.

There are two main stages in the EF welding process that, if done correctly using the right tools, can reduce the risk of leaking joints and failed welds.

1. Pipe preparation
This important step provides the foundation for a good weld joint and begins with making sure the HDPE pipe is cleaned and round. If ovality is found, a re-rounding tool/re-forming tool should be used.

Once the roundness of the pipe has been established, the pipes surface oxide layer needs to be removed. Various mechanical scraping tools are available that can remove the surface layer easily as they achieve a consistent peel depth.

Most mechanical scrapers are designed to be used on a range of pipe sizes regardless of the standard dimension ratio (SDR) rating. Using a mechanical scraper ensures that the whole surface, including underneath, has been peeled. Underneath the pipe is the most difficult to scrape using a hand scraper and is often the area where inconsistent or missed scraping occurs.

2. Pipe clamping and positioning
The use of pipe clamps is necessary for all joints. As the fusion process takes place the plastic becomes molten between the fitting and the pipe. This effect creates pressure between the pipe and the fitting, which forces the two pieces to move.

When clamps are used the movement is restricted and the molten plastic is forced together fusing the fitting and pipe. There are various types and styles of clamps for all situations encountered onsite.
Popular clamps have been designed to be used on range of pipe sizes and can adapt to angled joints of between 45° and 90°. Some clamps are designed to offer re-rounding capabilities, which removes the need for a separate re-rounding tool.
These clamps change pipe sizes by inserting or removing liners or shells. Other clamps are designed to be quickly installed and are usually smaller in physical size and don’t offer any re-rounding capabilities.

Whichever clamps are used, they must be left connected to the pipe for the full duration of the cool down time. This is a fundamental step in achieving a leak-free joint as the fused plastic is given sufficient time reform as a solid. This step is often overlooked, clamps are removed too early and the pipe is moved, causing stress on the joint and increasing the risk of leaks.

ExcelPlas Pipe Testing is a Leader in the Field of Polyethylene (PE) and High-Density Polyethylene (HDPE) Testing
ExcelPlas is accredited with the National Association of Testing Authorities (NATA) for butt weld tests, bend and tensile tests, peel decohesion tests on electro fusion sockets and failure mode determination

Jemena Announces Revised NGP Schedule for Pipeline Install

New Lightweight Welder For HDPE Pipes

New UHMWPE Pipe for Tailing Offers Greater Than 4X the Abrasion Resistance of PE100

ExcelPlas Poly Pipe Weld Inspection Lists Top 7 Causes of Weld Failure:
• Lack of scraping
• Inaccurate scraping
• Contamination from dirt, water, oil or clays
• Lack of Paralell-ness of fusion faces
• Misalignment of surfaces
• Time, temperature and pressure deviations
• Not adhering to cool times

We have extensive experience in inspection of poly pipe welds for assuring welded joint quality.  Direct Poly Pipe Inspection ensures that operators are following the proven welding procedure; this reduces the occurrences of operational errors which lead to defects such as inclusions, lack of fusion (LoF), porosity and misalignment. More information: contact [email protected]

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