product update THERMAL INSULATION
PU foaming technology used in Russian heating pipes
Russian district heating pipe maker FTK Rostr is using a new production technology from KraussMaffei Berstorff that enables it to apply a polyurethane foam insulation layer to its fibre reinforced PE pipes in a continuous process. The company, one of the
largest producers of polyolefin pipes in Russia, is using the new manufacturing technology in production of its Izola range of heating
pipes in diameters from 110 to 160mm. The high thermal efficiency polymeric pipes are being used to replace ageing installations across Russia. The manufacturing process
involves two steps. In the first, the base media pipe is extruded and wound onto drums. The pipes can incorpo- rate barrier layers if required. In the second stage, the media pipe is unwound from the drum, preheated and pulled through a shaping conveyor
where a mixing head injects the polyurethane mixture. A release film is simultaneously fed into the shaping system to prevent the foaming polyure- thane sticking to the shaping surfaces. After exiting the shaping
conveyor, the foam-encapsu- lated pipe is drawn through a sheathing die where a single screw extruder applies an external polyethylene protective layer. The finished insulated pipe is then wound onto drums for shipping. “With this system we are
taking into account environ- mental requirements but also the demand for cost- effective solutions,” says Michael Hofhus, head of the pipe extrusion product group at KraussMaffei Berstorff. “We see good opportunities in the expanding energy transportation markets.” ❙
www.kraussmaffeiberstorff.com
FABRICATION Trelleborg minds the gap
Trelleborg’s FlexSpacer is an easy to install device that ensures an airgap is main- tained between topside pipelines and any thermal insulation, minimising the risk of abrasive damage to the pipe coating.
Designed to replace
time-consuming and unreli- able on-site fabrication of metal spacers, the new elastomeric FlexSpacer can be
installed in seconds and eliminates the risk of damage to the coating or the installer. It has been qualified for use at continuous operating temperatures of up to 150˚C.
“With the
offshore industry heading towards even more challenging offshore applications, the need for high performance, durable
and reliable products, has never been greater,” says Oivind Eriksen, rubber components director at Trelleborg Offshore. ❙
www.trelleborg.com/offshore
PU sets level in waste water pipes
Bayer MaterialScience (BMS) has supplied two-part polyurethane coating materials for a number of wastewater pipeline coating projects in the Middle East. The Ya-Coat in-house
coating operation of SADIP (Saudi Arabian Ductile Iron Pipes Company) has used the materials in pipelines carrying water and aggres- sive wastewater. A key reason for the selection of the PU system was reduced risk of damage – epoxy coated alternatives are said to often need on-site repairs, according to BMS. Features of the BMS PU
coating systems include good protection against corrosion, low surface friction, good adhesion, and high resistance to cracking during flexing of the pipe. The materials are formulated for a 1:1 mixing ratio, which minimises the risk of incorrect ratio selection, while the typical coating thickness of 1.0- 1.5mm results in minimal restriction of flow. ❙
www.bayercoatings.com
November 2012 | PIPELINE COATING 49 PIPE LINING
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