MATERIALS | ETPs AND COMPOSITES
The PA12 pipes were extruded by Teel Plastics. A unique benefit of the inherent molecular make-up of the materials is that they are highly resistant to heavy hydrocarbons, making them ideal for harsh environmental conditions.
Fusion guide
PPI has also published a technical report with guidance on the fusion of PA12 pipe. “PA12 piping is now approved for use in
regulated gas applications and is well suited for high-pressure gas installations,” said Randy Knapp, engineering director of PPI’s energy piping systems division. “This new technical report provides a uniform joining procedure that brings a greater consistency to this aspect of gas pipeline installa- tion. It will help to facilitate the pipeline operator’s efforts to qualify the procedure, reduce costs, and simplify DOT’s enforcement duties.” ‘TR-50 Generic Butt Fusion Joining Procedure
for Field Joining of Polyamide-12 (PA12) Pipe’ is available free from PPI’s website.
Right: Conextru has developed a tool set to make multi- layer RTP pipe
Multi-layer RTP Pipe extruder specialist Conextru of Austria recently developed a toolset for production of multi-layer reinforced thermoplastic (RTP) pipes. The liner – or inner layer – of an RTP pipe is typically made of PE100 or PE-RT. To reduce the length of such a line, Conextru developed a standard head with side feed connection – with the extruder position parallel to the extrusion line. The head has a helical spiral distributor system, which has advantages such as low pressure build-up, close wall thickness tolerance and short residence time. Common liners have a wall thickness range of 5-20mm and diameter range of 110-400mm at a production rate of up to 900 kg/h, says the company. This kind of monolayer helical spiral head – with the same spiral geometry – can also be used for
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monolayer liners made of PA, PVDF, PPS or other suitable materials. The multilayer head for this application can
produce a three-layer structure with PE outside, adhesive layer in the middle and high temperature- and chemical-resistant material on the inside. For best melt distribution, a triple helical spiral distributor is applied. The spiral geometries are different, depending on factors such as viscosity and throughput. Conextru says it has a library of geometries for different viscosities. In this project, a special solution was designed
to produce the liner in co-ex (PE/adhesive/PA) or mono-layer PE version. The mono-layer and multi-layer heads had the same melt feed point, so the PE extruder can stay in position in case of a change from mono-layer to multi-layer.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.zeusinc.com �
www.exelcomposites.com �
www.elkamet.com �
www.sabic.com �
www.plasticpipe.org �
www.evonik.com �
www.conextru.eu
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