ZPU Miedzyrzecz is a modern manufacturer which specialises in the production of preinsulated pipe systems for channelless heating networks. - http://www.consena.lt/site/en/vidinis/vid_meniu/izoliuoti_va...

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Logstor is credited with having invented pre-insulated pipe technology and have supplied more than 160000 km (99500 miles) of pipe with over 40 years - http://www.urecon.com/systems/en253.html


Sieci preizolowane układane są bezkanałowo, bezpośrednio w ziemi na podsypce i zasypce - http://www.zpec.pl/nasze-produkty/potencjal-techniczny/siec-...




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Note added at 6 hrs (2012-06-07 01:59:33 GMT)
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channel-free brzmi lepiej ..

It is a pipe system for a channel-free, direct underground or overground laying - http://www.pipesystems.com/domains/pipesystems_com/data/free...

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