Ngokuthuthuka okuqhubekayo kwezizinda zikawoyela negesi ezingasogwini, amapayipi okuthutha inani likawoyela negesi angaphesheya kolwandle ayakhula.Njengamanje amapayipi ahamba ngaphansi kolwandle asetshenziswa ikakhulukazi i-3LPE ne-FBE.3LPE izinga lokushisa lokusetshenziswa kwesikhathi eside ngokuvamile alidluli ku-70℃, yesikhashana kufika ku-80℃.Ngokuqondene nokuthuthwa kukawoyela ongahluziwe izinga lokushisa lingaphezu kwama-80℃, sebenzisa 3LPE enamathela isakhiwo ngokucacile azihlangabezani nezidingo zobuchwepheshe.Ngenkathi izinga lokushisa lokusetshenziswa kwesikhathi eside le-FBE enamathela lingafinyelela ku-115℃, ukuze kuhlangatshezwane nezidingo zokushisa zomklamo ongenhla, kodwa ukumbozwa kwe-FBE kuyafiphala, ukungabekezelelani kokulimala kwemishini kwezokuthutha kanye nokubekwa kwamapayipi asogwini lolwandle, umonakalo wokuvala ukugqwala kubi kakhulu, Okwamanje amapayipi angaphansi kolwandle ngokuvamile awakukhuthazi ukusetshenziswa kokugqwala ngendlela ungqimba olulodwa lwe-FBE.

Ukubhekana ngokuphumelelayo nezimo zokuthutha ezinkingeni zokugqwala kwezinga lokushisa eliphezulu elingaphansi kolwandle, amazwe angaphandle abe ngempumelelo isakhiwo sokuhlanganisa i-3LPP ukuya epayipini, njengamapayipi olwandle ajulile eGulf of Mexico kanye namapayipi kawoyela negesi e-UK North Sea, njll., asetshenziswa 3LPP. isakhiwo, kodwa ukunamathela kwe-3LPP kusetshenziswe epayipini elingaphansi kolwandle ezweni asikho isibonelo.

I-Polypropylene inezakhiwo ezinhle kakhulu zemishini, isivuno sayo, i-tensile, amandla okucindezela, ukuqina, ukunwebeka nokumelana nokugqoka kune-high density kanye ne-polyethylene (HDPE) ephakeme, kanye ne-polypropylene ephansi kakhulu yokumuncwa kwamanzi, amanzi 24h Ukumuncwa kwamanzi okungu-0.01% kuphela, iphansi kakhulu kune-HDPE.I-polypropylene imelana nokusimama kwamakhemikhali, ukugqunywa kukagesi, nokuminyana okuphansi kune-polyethylene.Mayelana nokumelana nokushisa, ukusetshenziswa kwesikhathi eside kwe-polyethylene eguquliwe ekushiseni kuka -30 ~ 110℃.I-3LPP ithuthukiswe ngesisekelo se-3LPE enamathela ekusebenzeni okuhle kakhulu kwe-anti-corrosion coating.Isimiso se-3LPP 3LPE nesakhiwo esifana nesamukelwe ekuhlanganiseni kwensimbi okungaphansi kwe-epoxy (FBE), ukwandisa ukunamathela ensimbi, maphakathi nesendlalelo se-polypropylene copolymer adhesive (PPA), kanye nongqimba lwangaphandle lwe-polypropylene (PP) isibopho esiqinile, kokubili ukumelana okuphezulu namandla okulimala komshini, nokumelana okuhle nokusebenza kokukhumula kwe-cathodic.I-3LPP ishintshwe ngesakhiwo sokumboza, ukusetshenziswa kwezinga lokushisa elingaphezu kuka-110℃, ukumelana kwayo okuhle kakhulu nokugqwala nokusebenza kwezinga lokushisa eliphezulu ukuze iwine amathuba emakethe ebanzi, izinga lokushisa eliphakeme elinamathelayo alikwaleli okunye ukusilela, ukufeza izinga lokushisa eliphakeme futhi lihlose ukusetshenziswa kwamanzi ajulile, kuvela ukumboza okuthuthuke kakhulu okulwa nokugqwala. emazweni ngamazwe.