Ob qhov kev lag luam loj uas sawv cev rau cov neeg tsim cov khoom siv polymer cov tub luam tau tau txuas cov txiaj ntsig ntawm lawv cov khoom tsis-corroding rau xyoo lawm thaum lawv sib tw tawm ntawm lwm cov ntaub ntawv thiab yeeb nkab uas tau nyob ib ncig ntawm ntau tshaj li ib puas xyoo.
Cov thawj coj ntawm Plastics Pipe Lub koom haum thiab Uni-Bell PVC Yeeb Nkab Association tau hais tias lawv txais tos cov American Chemistry Council txoj kev sib tw txog lawv saib raws li cov khoom lag luam niaj hnub tawm thiab cov kev cai hais txog kev tiv thaiv cov khoom txig ntawm cov khoom ntiag tug thiab cov kev tsim kho tshiab .
Tony Radoszewski, Thawj Tswj Hwm ntawm Plastics Pipe Institute, hais tias hauv kev sib tham hauv xov tooj tau hais tias "ACC muaj qhov twg los qhia peb." "ACC coj nws lub koob npe nrov, kev khav theeb, thiab nyiaj txiag thiab kev pabcuam neeg - lawv muaj khau rau hauv av - muab lub suab hais tias txhua yam peb tsis tau muaj sijhawm los nthuav qhia."
Cov lus yog yooj yim: Yog hais tias ib lub nroog, lub zos los yog lub zos tau txais cov nyiaj rau lub xeev rau cov yeeb nkab lossis cov khoom, tag nrho cov khoom uas ua tau raws li kev xav tau ntawm engineering yuav tsum raug tso cai rau hauv kev sib tw.
"Peb hu nws ncaj ncees thiab qhib kev sib tw, qhov ntawd yog txhua yam peb tab tom thov," Radoszewski said. "Peb tsis yog yuam kom leej twg txhais tes siv ib yam khoom, Peb tsis hais tias ib yam khoom zoo dua li lwm yam, peb tab tom hais tias tsawg kawg cia cov ntaub ntawv los sib tw."
Raws li hauv Dallas, PPI muaj 150 cov neeg koom tes uas feem ntau cov chaw lag luam ntawm cov yeeb nkab polyethylene, uas yog cov kev siv cov roj-thiab-natural-roj sib sau cov ntaub ntawv nrog nws cov tshav kub kub, cov pob tsis si dawb. PPI kwv yees PE yeeb nkab muaj li ntawm 15 feem pua ntawm cov lag luam huv sanitism thiab 8 feem pua ntawm kev lag luam uas siv tau hauv Tebchaws Meskas. Nyob hauv Tebchaws Europe, txawm li cas los xij, PE yog qhov tsis muaj 1 yeeb nkab khoom siv hauv dej systems.
PVC thiab cov yeeb nkab yeeb nkab yog cov ntaub ntawv tseem ceeb hauv cov dej hauv Teb Chaws Asmeskas thiab cov kav dej phwj, raws li Bruce Hollands, tus thawj coj ntawm PVC cov yeeb nkab koom ua ke, uas kuj yog nyob hauv Dallas thiab muaj txog 45 tus tswv cuab thiab cov koom tes.
Hollands cia siab tias ACC qhov kev tsim kho tau tsim kev paub txog cov yeeb nkab yas nyob rau sab qaum teb Midwest thiab sab qaum teb - "thaj chaw uas koj muaj feem xyuam tshaj plaws iron" - thiab twv "txhag cia siab" ntawm civil engineers tsuas nyiam nrog cov khoom siv.
"Xav txog nws li no: Yog tias koj muab tso rau hauv lub xov tooj, koj puas yuav siv xov tooj ntawm tes lossis mus nrog lub network cellular?" Hollands nug.
Nws tsis txhawj xeeb tias lo lus nug yuav raug teb nrog PE yeeb nkab lossis ib yam khoom, tiam sis PVC.
"Peb muaj kev ruaj siab ntawm qhov uas peb cov khoom sawv hauv kev sib xyaw," nws hais. "Peb tsis muaj teeb meem sib tw nrog tag nrho cov ntaub ntawv."
Xav tau lub sijhawm
Tsoomfwv Meskas Lub Tsev Haujlwm Saib Xyuas Kev Ua Yeeb Yam yuav tsum tau xaiv cov ntaub ntawv xaiv thiab xa mus rau cov dej thiab dej phwj hauv nroog uas siv tsoomfwv cov nyiaj hauv cov cheeb tsam uas muaj neeg coob tshaj 10,000 lossis tsawg dua, Hollands said.
"Qhov no yog ib txoj cai ntev-ntev ntawm USDA txoj kev pab rau cov neeg zej zog vim txij thaum xyoo 1970," nws ntxiv. "Nws ua haujlwm zoo, yog li vim li cas ho tsis ua tib yam li cov nyiaj siv uas cov xeev muab cov chaw?" Yog hais tias lub xeev yuav siv nyiaj dej los sis dej phwj tuaj, vim li cas ho tsis xav tau cov ntaub ntawv uas niaj hnub tsim nyog Qhov kawg, cov kws kho tsheb tuaj yeem txiav txim tau. "
Hauv zos cov zej zog nrhiav cov lag luam qis tshaj plaws tau tsim muaj ntau ntawm PVC yeeb nkab thiab nws qhov kev ua tau zoo, Hollands said.
"Thaum koj tso cai rau txhua tus neeg los sib tw, ces cov ntaub ntawv uas yog qhov zoo tshaj plaws thiab ruaj khov muaj sij hawm los muab lawv qhov chaw nyob rau hauv lub khw," nws hais. "Muaj qee lub nroog loj nyob hauv Dakotas nrog 6,000 mais ntawm cov kav dej hauv lawv - thiab loj 36- thiab 42-nti theem - nrog cov nqi so tsis txaus."
Ob lub sij hawm ntev thiab kev tswj tus nqi rau cov kav dej yas qis dua hlau kav, uas corrode ces xau thiab so, polymer yeeb nkab tawm tswv yim hais tias.
Cov huab cua txias tsis yog ib qho teeb meem, txawm tias Hollands hais tias, txawm hais tias qhov kev sib tw tseem hais li cas. Piv txwv, thaum Lub Plaub Hlis Ntuj 4 tawm ntawm Michigan xov xwm los ntawm ib tug neeg piav txog nws tus kheej raws li tus lag luam ntawm cov yeeb nkab ua tau hais tias PVC tsis haum rau cov cheeb tsam uas muaj qhov sib sib zog nqus ntawm cov pob zeb zoo li lub xeev Upper Yav Ntoo Peninsula.
"Zoo, koj yuav ua li cas rau qhov tseeb tias PVC siv ntau dua hauv Canada dua li Meskas?" Hollands nug. "Uas tag nrho negates tias taw tes."
Lub koom haum Ductile Iron Pipe Research Association tseem tuaj yeem tuaj yeem tuaj yeem tawm tsam kev cai muag khoom, qhib rau hauv lawv lub website thiab hauv cov rooj sib tham rau pejxeem raws li kev sim los nrhiav "preferential treatment" rau yas thiab kev hem thawj rau cov kev xaiv hauv zos.
"Qhov no tsis yog kev sib ntaus ntawm cov yeeb nkab khoom, nws yog kev sib ntaus los tiv thaiv kev tswj hwm hauv zos thiab kev ua haujlwm," DIPRA lub website hais tias.
Cov yeeb nkab yas yeeb yaj kiab tawm tsam lawv tab tom nrhiav kev vaj huam sib luag rau kev kho khoom noj khoom haus uas yuav muaj kev xaiv rau cov cheeb tsam.
"Yog tias peb tsis yog ib yam khoom zoo thiab ib qho khoom lag luam, lawv yuav tsis tu, tab sis pom lawv ua," Radoszewski said. "Thaum cov rooj sib hais tuaj, lawv nqa tag nrho lawv cov phooj ywg rau qhov pom tias qhov no yog qhov phem tshaj plaws.Thaum rub tawm tag nrho cov nres lawv ua tau kom muaj kev cuam tshuam rau txoj cai tsis yog lub yeeb yam tshwm sim rau txoj cai . "