[Mafotokozedwe ambiri] Polyethylene ndi pulasitiki, yomwe imadziwika chifukwa cha kuchuluka kwa kachulukidwe, kusinthasintha komanso kukhazikika kwamankhwala. Ndi yabwino kwa kuthamanga ndi sanali kukakamiza mapaipi ntchito. Mapaipi a HDPE nthawi zambiri amapangidwa ndi polyethylene 100 resin, yokhala ndi kachulukidwe ka 930-970 kg/m3, yomwe imakhala pafupifupi ka 7 kuposa chitsulo.

Polyethylene ndi pulasitiki, yomwe imadziwika ndi kuchuluka kwa kachulukidwe, kusinthasintha komanso kukhazikika kwamankhwala. Ndi yabwino kwa kuthamanga ndi sanali kukakamiza mapaipi ntchito. Mapaipi a HDPE nthawi zambiri amapangidwa ndi polyethylene 100 resin, yokhala ndi kachulukidwe ka 930-970 kg/m3, yomwe imakhala pafupifupi ka 7 kuposa chitsulo. Mipope yopepuka ndiyosavuta kunyamula ndikuyika. Polyethylene sichimakhudzidwa ndi njira ya electrochemical corrosion, ndipo ndizofala kuti mapaipi awonongeke ndi mchere, asidi ndi alkali. Malo osalala a chubu cha polyethylene sichidzawonongeka, ndipo kukangana kumakhala kochepa, kotero chubu chapulasitiki sichimakhudzidwa mosavuta ndi kukula kwa tizilombo toyambitsa matenda. Kutha kukana kuwonongeka kwa dzimbiri ndi kuyenda kosalekeza kumapangitsa kuti mipope ya HDPe ikhale yotsika kwambiri. Chitoliro cha polyethylene chikhoza kupangidwa ndi utomoni wolimbikitsidwa, wotchulidwa kuti PE100-RC, ndikuwonjezedwa kuti muchepetse kukula kwa ming'alu. Mapaipi opangidwa akhoza kukhala ndi moyo wautali wautumiki, ndipo polyethylene ili ndi phindu lachuma pa moyo wa polojekitiyi.

Tsopano kuti kulimba kwa mapaipi a HDPe kwatsimikiziridwa, chuma ndi chofunikira kwambiri pamene mapaipi a polyethylene amagwiritsidwa ntchito popanga madzi osungira madzi. Poyerekeza ndi mapaipi achitsulo a ductile, mwayi wodziwika bwino wa mapaipi a polyethylene ndikuti amatha kupewa kutayikira. Pali mitundu iwiri ya kutayikira kwa mapaipi: kutayikira kolumikizana, kuphulika kwapaipi ndi kutayikira kwapaipi, zomwe ndizosavuta kuzigwira.

Kukula kwaMtengo wa HDPEili pakati pa 1600 mm ndi 3260 mm, ndipo mapaipi akuluakulu omwe ali pamsika angagwiritsidwe ntchito. Kuphatikiza pa machitidwe operekera madzi am'matauni, mapaipi apulasitiki okhala ndi mainchesi akulu opangidwa ndi polyethylene atha kugwiritsidwanso ntchito pochotsa madzi am'nyanja komanso m'malo opangira madzi oyipa. Mapaipi akulu akulu amatha kukhala kuchokera 315 cm mpaka 1200 cm. The lalikulu lalikuluMtengo wa HDPendi cholimba kwambiri komanso chodalirika. Pambuyo pokwiriridwa pansi, imatha kuyenda kwa zaka zambiri ndipo imafuna kusamalidwa pang'ono, choncho ndiyoyenera kwambiri kugwiritsa ntchito madzi otayira. Kukhalitsa kwa chitoliro cha polyethylene kumawonjezeka pamene kukula kwake kumawonjezeka, kusonyeza ntchito yotsutsa-kugwedezeka. Tengani chivomezi cha 1995 ku Kobe ku Japan monga chitsanzo, zomangamanga zamatawuni; mapaipi ena onse amalephera kamodzi pa makilomita atatu aliwonse, ndipo makina onse a mapaipi a HDPE salephera.

Ubwino wa chitoliro cha HDPE: 1. Kukhazikika kwamankhwala abwino: HDPE ilibe polarity, kukhazikika kwamankhwala abwino, sikumabala algae ndi mabakiteriya, sikumakula, ndipo ndi chinthu chokonda zachilengedwe. 2. Mphamvu yabwino yolumikizira: gwiritsani ntchito socket fusion yamagetsi kapena matako ophatikizana matenthedwe amafuta, okhala ndi mfundo zochepa komanso osataya. 3. Low madzi otaya kukana: The pamwamba pamwambaMtengo wa HDPendi yosalala, yokhala ndi coefficient yotsika yokana kuvala komanso kuyenda kwakukulu. 4. Kukana kwabwino kwa kutentha kochepa ndi brittleness: kutentha kwa brittleness ndi (-40), ndipo njira zodzitetezera zapadera sizifunikira kuti pamangidwe kutentha kochepa. 5. Kukana kwabwino kwa abrasion: Kuyesa kuyerekezera kwa kukana kwa abrasion kwa mapaipi a polyethylene ndi mapaipi achitsulo amasonyeza kuti kukana kwa abrasion kwa mapaipi a polyethylene ndi 4 nthawi ya mapaipi achitsulo. 6. Kuletsa kukalamba ndi moyo wautali wautumiki: Chitoliro cha HDPE chikhoza kusungidwa kapena kugwiritsidwa ntchito panja kwa zaka 50 popanda kuonongeka ndi cheza cha ultraviolet.