Qhov sib txawv ntawm high-density heat-resistant polyethylene rwb thaiv tsev yeeb nkab thiab steel yeeb nkab yog reflected nyob rau hauv lub thermal expansion thiab contraction yam ntxwv, PE-RT II PE yeeb nkab muaj ib tug loj npaum li cas ntawm expansion, tab sis lub expansion quab yuam yog heev me me; thaum cov yeeb nkab steel, ntawm qhov tsis sib xws, muaj qhov me me ntawm kev nthuav dav, lub zog nthuav dav loj heev.
Yog li ntawd, nyob rau hauv tib daim ntawv thov tej yam kev mob, lub expansion quab yuam ntawm PE yeeb nkab yog feem ntau tsawg tshaj li 1/50 ntawm cov yeeb nkab steel. rau centralized cua sov theem ob yeeb nkab network nrog prefabricated thermal rwb thaiv tsev PE yeeb nkab, cov yeeb nkab axial kev nyuaj siab feem ntau muaj xws li thermal expansion thiab contraction ntawm pipeline thermal expansion kev nyuaj siab, thermal rwb thaiv tsev txheej thiab cov yeeb nkab ua hauj lwm ntawm lub shear kev nyuaj siab thiab kev sib txhuam ntawm cov yeeb nkab sab nrauv thiab cov av kev nyuaj siab. . Thaum kev sib txhuam ntawm cov yeeb nkab tiv thaiv sab nrauv thiab cov av ntau dua los yog sib npaug ntawm cov thermal expansion quab yuam tsim los ntawm cov yeeb nkab, cov yeeb nkab seem yuav tsis tsim thermal hloov.
Lub axial thermal expansion quab yuam ntawm cov yeeb nkab ua haujlwm yog me dua li lub zog shear ntawm cov yeeb nkab ua haujlwm thiab cov rwb thaiv tsev, yog li yuav tsis muaj delamination ntawm cov yeeb nkab ua haujlwm thiab cov rwb thaiv tsev. Qhov no txhais tau tias: yog li cov yeeb nkab tuaj yeem muab tso rau hauv qhov chaw faus ncaj qha yam tsis muaj kev them nyiaj, thiab tsis tas yuav siv cov kev kho ntxiv, uas tuaj yeem txo cov peev nyiaj thiab kev tsim kho nyuaj.
High-density heat-resistant polyethylene yeeb nkab kuj muaj cov yam ntxwv hauv qab no piv nrog cov yeeb nkab steel zoo tib yam:
(1) zoo thermal rwb thaiv tsev kev ua tau zoo, txheej txheej thermal conductivity tsuas yog 0.42W/mK, kub poob qis dua cov yeeb nkab steel, kev ua haujlwm ntev tuaj yeem txuag tau ntau lub zog, txo qis zog. tus nqi.
(2) muaj cov dej tsis muaj zog thiab corrosion kuj, txhim khu kev qha sealing, tsis muaj seepage thiab tsis to; tsis muaj corrosion, tsis muaj kuab paug ntawm cov dej tsis zoo, tsis muaj scaling thiab clogging, nyob rau hauv kev tswj txhua hnub thiab kev saib xyuas ntawm cov yeeb nkab cua sov network muaj qhov zoo dua.
(3) Nyob rau hauv qhov kub thiab txias kuj muaj qhov zoo corrosion kuj thiab cuam tshuam tsis kam, cov khoom embrittlement kub ntawm -70 degree, tuaj yeem yooj yim tiv nrog kev siv hauv qhov chaw txias.
(4) Kev kub siab thiab kub tsis kam, kev ua haujlwm ruaj khov, 70 degree kev pabcuam lub neej txog li 50 xyoo.
(5) Yooj yim kub-melt docking thiab electrofusion vuam, ruaj thiab txhim khu kev qha.
(6) Cov txheej txheem kev tsim kho yog yooj yim thiab ceev, kev tsim kho yooj yim thiab kev teeb tsa, tsis tas yuav txuas cov yeeb nkab trench, tuaj yeem ncaj qha faus rau hauv av. Qhov no zoo heev txuag tus nqi tsim kho ntawm PE-RT II pipeline thiab ua rau lub sijhawm tsim kho. Xav txog cov nqi zog, cov nqi khoom siv thiab cov khoom siv kho tshuab, tus nqi tsim kho ntawm PE-RT II pipeline tuaj yeem txuag tau 30% piv nrog cov yeeb nkab steel.
(7) Cov kav dej zoo li no muaj kev tiv thaiv zoo heev rau kev tawg sai thiab tawg qeeb, thiab tuaj yeem rov qab tau tom qab flattening; ib zaug lub raj xa dej tawg, tawg, thiab lwm yam, cov yeeb nkab presser tuaj yeem siv los paub txog kev ua haujlwm hauv dej hauv zos, uas yooj yim rau kev kho thaum muaj xwm ceev thiab txuag nqi thiab sijhawm.
(8) Economic feasibility: 90mm txoj kab uas hla, high-density tshav kub-resistant polyethylene yeeb nkab khoom nqi yog piv nrog cov yeeb nkab steel; 110mm lossis ntau dua, 10-20% siab dua cov yeeb nkab steel. Yog tias ua ke nrog kev tsim kho thiab kev ua haujlwm, kev kub ceev-resistant polyethylene yeeb nkab hauv dn355 hauv qab kev lag luam yog siab dua cov yeeb nkab steel.