Umbhalo wokusebenzisa i-high-density polyethylene (HDPE) uyabeka ubukhulu bokuphatha kwe-HDPE pipe emizini engaphansi kakhulu.

Isayensi yombhalo: Sizinga njani isithembiso se-molecular structure se-HDPE ukuthi sibhekene ngokuphelele nemizini engaphansi kakhulu

Ubukhulu obungaphansi kakhulu bokuphatha kwe-HDPE pipe bukhuthaza kusuka kwe-sithembiso sakho se-polymer esihlukile. Ubukhulu be-crystallinity—okungu-70–80% kahle—bukhuthaza kusuka kwezinhlobo zezincwadi ezilungile ezinamandla okuhambisana ngokuphelele, okwenza amandla okuhambisana okuphelele. Lokhu kuyabeka umgodi we-hydrocarbon oshwele ukuze akuthintane nokuthintana kwe-electrochemical kanye nokuphatha kwezinhlobo zemifula, izinkundla, kanye nezinsalisi, ngakho akufana nezinto eziningi noma i-concrete ozobhekene ngokuthintana kwe-oxidation noma izinkinga zezinkundla.

Ukukhanya kakhulu nokubheka kwemithombo yamaphakathi yokuphakamisa kuyasinda ukugwala nokuhlehlwa

Ukungabheki kwe-HDPE kwenza amathuba okukhanya okuphelele akhuthaza:

• Ukungafihlwa ku-ions nasezinto ezingavunyelwa okuzosinda izimbiza zokugwala ezisemthwakweni wokuphakama
• Ukungabiyo kwamandla okusindayo ukubeka kwemithombo yamaphakathi futhi ukugwala okusindwayo ngemithombo yamaphakathi (MIC)
• Ukungabiyo kwemiphumela yamaphakathi yamandla, okusindayo imikhombiso yokuqinisa okudingekayo yezinhloko zokuphakama

Ukuthinteka kokugwala kwemiphumela yomoya nesikhathi sokufa kwezinye izinkathi (−40°C ku-50°C+)

Le nto igcina ukuqina ngisho nasemazingeni okushisa angaphansi kuka-zero ngenxa yesakhiwo sayo se-polymer esinamaketanga amade, esihlwanyela amandla okuhlasela ngaphandle kokwephuka. Amafomu agcinwe i-UV kanye namaphakethe ezengezo ze-antioxidant athuthukisa ukuqina ukuvimbela ukuwohloka kwe-photo-oxidative ezakhiweni eziveziwe nokunciphisa ama-radicals akhululekile aholela ekugugeni kwe-thermoplastic. Lo mklamo ohlanganisiwe wamangqamuzana wenza kube nokwenzeka ukusebenza ngendlela enokwethenjelwa phakathi nemijikelezo yokushisa eyeqisayo, kusukela ezakhiweni zase-Arctic kuya emagageni okushisa asogwadule, ngaphandle kokwakheka kokugqwala noma ukuwohloka.

Ukumelana Namakhemikhali Okuphakeme: I-HDPE Pipe vs. Izindlela Ezingokwesiko Ezindaweni Ezinenkani

Ukuqhathaniswa kokusebenza: Iphayiphi ye-HDPE iyadlula insimbi eguquguqukayo, i-PVC nensimbi enamathele ezindaweni ezinama-asidi, iziphuzo ezinosawoti namanzi angcolile

I-paipi yase-HDPE (high-density polyethylene) iyathintela ukuthi izinkimende zihlaziywe kumiphumela yomkhakha. Umqondo wakho we-hydrocarbon ongavumelekile nokukhanya kakhulu kwakhe kuvikela ukuthi kuhlehlwe—lokhu kuyindlela eyinkulu yokuphulwa kwe-ductile iron ne-steel ephindwe ngokwesikhathi esithile lapho isetshenziswa ekhaya le-acid noma le-saline. I-PVC, nakuba iyathintela kakhulu, iyahlupha ukuthi iphinde kakhulu futhi iyathintela ukuthi izinkimende zihlaziywe kusasa. Kwezinhluvo zezibhambo—lapho i-pH iphinda phakade futhi izinto ezingenayo njenge-hydrogen sulfide zingasemthwakweni—i-HDPE ithabatha umkhakha wakho ngaphandle kokuphulwa kwezinye izinto. I-tabeli esizungu sizoba yamandla okuthi amandla akhona ngokuhlukahluka:

Isici	Isibhalo se-HDPE	I-Ductile Iron	PVC	I-Steel Ephindwe
Ukuthintela kwe-acids	Excellent	Okubi (kuphula)	Kahle	Okhulu (ukuphinda kwe-coating kuphula)
Ukuthintela kwe-saline	Excellent	Emibi	Kahle	Okubi (kuphula kwe-pitting)
Ubude bokuphila kwezibhambo	>50 iminyaka	<20 iminyaka (ephindwe)	25–30 iminyaka	15–20 iminyaka
Isiphumo sokugqibela / isiphumo sokufa ngenxa yokubulawa	Okuncane	Ekhulu (ukuphakamisa)	Emisweni eyinkulu (amaphutha amakhulu)	Ekhulu (ukuphakamisa kwezinkotho)

Ukusebenza kwe-pH kubalulekile (1–14) kubonisiwe ngokwemisebenzi yezindawo zokusebenza kwezindawo zokugcina izilwanyana nezindlela zokuthumela izinhlangano zokusebenza nezinhlangano zokusebenza ngokwemithombo yezinhlangano

Izihlangu zesikhumba se-HDPE zisebenza kahle kuzo zonke izinhlangano zokusebenza kwe-pH—kusha kwezinhlangano ezinomthwakazi (pH 1, isibonelo: isihlangu sesulfuric) kuze kwezinhlangano ezinomthwakazi (pH 14, isibonelo: isihlangu sesoda)—okubonisiwe ngokwemisebenzi yezindawo zokusebenza kwezindawo zokugcina izilwanyana. Izindawo zokugcina izilwanyana zokusebenza kwezindawo zokugcina izilwanyana zizigcina izilwanyana ezinomthwakazi kanye nezinhlangano ezinomthwakazi kuzo zonke izindawo zokusebenza ngokwemithombo yezinhlangano ngaphandle kokuphakamisa izihlangu. Kwezinhlangano zokusebenza, i-HDPE ibonakaliswe njengokubuyisela izihlangu zesithili esinomthwakazi kwezinhlangano zokuthumela izinhlangano zokusebenza, okuvimba ukuphakamisa izihlangu, ukunciphisa ubude bezihlangu, nokususa izinkotho ezinomthwakazi noma ukusebenzisa izihlangu zokuphakamisa izihlangu. Lezi zinhlangano zibonisa ukusebenza kwe-HDPE ngaphandle kokusebenzisa izihlangu ezingavunyelwa lapho izinhlangano zokusebenza zingafanele.

Ukuqina kwesakhiwo okuqinisekisiwe kwesikhathi eside: Ukumelana nokukhula kancane kokugqwala nokuphila iminyaka engu-50 +

Ukuqinisekiswa kokuhlolwa kwe-ISO 13479 ne-ASTM D5397 okuqinisekisa ukumelana kwepayipi le-HDPE nokukhula kancane kokwephuka ngaphansi komthwalo oqhubekayo

Ukuqina kwesakhiwo sesikhathi eside sepayipi le-HDPE kuqinisekiswa ngokuqinile yi-ISO 13479 ne-ASTM D5397 izivivinyo ezijwayelekile ezilingisa amashumi eminyaka omthwalo ophikelelayo wokucindezela ukuhlola ukumelana nokukhula kancane kokwehla (SCG). Lezi zindlela ziqinisekisa indlela isakhiwo samangqamuzana e-HDPE esivimbela ngayo kokubili ukuqala kokuqhekeka nokwanda ngaphansi kwezimo ezifuna amandla. Ngokungafani nezinto eziphukile ezisheshe ziphuke, i-HDPE igcina isakhiwo sayo siqinile ngisho nalapho kunamaphutha amancane, inikeza amandla amaningi nokusebenza okulula ukukubona. Ngenxa yalokho, ipayipi le-HDPE lihlala liphila iminyaka engaphezu kwengu-50 ekudlulisweni kwamanzi kamasipala, ekuphatheni amanzi emvula, nasekuphayipheni izinqubo zezimbonikusekelwe amashumi eminyaka yokusebenza emkhakheni kanye nama-protocol okuhlola avunyelwe emhlabeni jikelele.

Imibuzo Evame Ukubuzwa

Yini okwenza amapipa ase-HDPE abe nekukhathazeka kwe-corrosion kunye nokukhathazeka?

Amapipa ase-HDPE anemiphumela yezinkundla zokubalwa okuphezulu kunye nomphathi wokubalwa we-hydrocarbon owengenakho ukuthi wabalekwe. Lezi zinhlobo zikhubaza ukukhathazeka, ukulayishwa kwe-biofilm, ukukhathazeka okwenzelwe ngamaphuqo (MIC), kunye nokuthatha isikhathi sokubalwa esebenzisa i-electrochemical.

Yini okwenza i-HDPE ikhathazeka kwezimo zokuphakeme zomhlaba?

Isithembiso se-polymer sase-HDPE sokudlula izinsuku sikhona kusobala ukuthi sibe nezinkundla zokubalwa ezingenakho ukuthi zibalekwe emizimini yezinkundla ezihambisana nge-−40°C ukuze kube nge-50°C+. Amasimbi akhethekile njenge-UV stabilizers kunye ne-antioxidants asihlinza ekukhathazekeni kwe-photo-oxidative futhi asindise isikhathi sakhe sokusebenza.

Kungani amapipa ase-HDPE abaqondwa kakhulu emilonga yezindiza kunye nezimo zokubalwa?

Amapipa ase-HDPE abadlula izinto zokusebenza zokuvamile njenge-ductile iron, PVC, kunye ne-steel ephathwe ngokufanayo emilonga yezindiza, emilonga yezinkundla zokubalwa, kunye nemilonga yezindiza ngokuba bezinakho ukukhathazeka kwezinto zokubalwa futhi banezinkundla zokubalwa zokusebenza.

Isikhathi sokusebenza kwezinkundla zokubalwa kwezinkundla zase-HDPE sikhuphuka kanjani?

Izihlilo ze-HDPE zinakuba ne-“service life” engaphezulu kwezinsizukulwane ezimibili, esiqhathaniswa ngokuphathwa kwe-ISO 13479 kunye ne-ASTM D5397 ukuzithemba kwezinkinga zokugcina kokugcina kwezinye izinhlobo zezinkambo zokugcina nokubaluleka kwezinkinga zokugcina okuphakathi kwesikhathi eside.

Ukuthi i-HDPE isenzi nini ekubaleni izinhlobo eziningi zesi-pH?

I-HDPE isenzi ngendlela efanelekileyo kuzo zonke izinhlobo zesi-pH (1–14), futhi yisifundo sokuthi yisifundisa kakhulu kuzo zonke izindawo eziphatha izihlilo zokufaka izinkambo ezinkulu, izihlilo zokufaka izinkambo ezinkulu, kunye nezinhlobo zezinhlobo zezibhalo zokusebenza emisebenzini.