Ukukhetha izinto ezifanelekileyo zokuvala umbhobho womlilo sisigqibo esibalulekileyo kwiinjineli zokhuseleko lomlilo kunye namagosa okuthenga kwimizi-mveliso. Izinto zokuvala umbhobho zinefuthe ngqo ekuqineni kombhobho, ubunzima, ukusebenza kakuhle kokuhamba kwamanzi, kunye nokumelana nezinto ezibangela uxinzelelo lokusingqongileyo. Okwangoku, iPolyvinyl Chloride (PVC) kunye nePolyurethane (PU) zimele ii-linings ezimbini eziqhelekileyo ze-thermoplastic ezisetyenziswa kwizicelo zobuchwephesha zokucima umlilo kunye nokukhupha umbane kwimizi-mveliso. Nangona zombini ezi zinto zisebenza ukuthintela ukuvuza kunye nokwenza lula ukuthuthwa kwamanzi, iimpawu zazo zomzimba phantsi kweemeko ezinzima zahlukile kakhulu, zichaphazela iindleko zobomi bonke kunye nokusebenza kakuhle kweenkqubo zokukhusela umlilo.

Ukwakhiwa kwezinto kunye neempawu ezibonakalayo zeepayipi zomlilo ezine-PVC

I-Polyvinyl Chloride (PVC) yi-polymer yeplastiki eyenziweyo esetyenziswa kakhulu ekwenzeni izintoipayipi yomlilo eqhelekileyoiimveliso ngenxa yohlobo lwayo olungabizi kakhulu kunye nozinzo lweekhemikhali. Iilinki zePVC zihlala zijiyile kunezinye iindlela zePU ukuze kufezekiswe ukulinganiswa koxinzelelo olufanayo. Olu bukhulu lunegalelo kubunzima obukhulu ngokubanzi, obunokwandisa ixesha lokusetyenziswa ngexesha lokuphendula ngokukhawuleza. Nangona kunjalo, iPVC ibonakalisa ukumelana okuhle kakhulu neekhemikhali kunye neeoyile ezahlukeneyo, nto leyo eyenza ukuba ibe lukhetho olufanelekileyo lokukhupha izinto ezisisiseko kwimizi-mveliso kunye nokunkcenkceshela kwezolimo apho ukuguquguquka okukhulu kumaqondo obushushu aphantsi kungengomfuneko iphambili.

Iingenelo zobugcisa zeepayipi zomlilo ezinePolyurethane (PU)

I-Polyurethane (PU) yi-elastomer esebenza kakuhle enika umlinganiselo ophezulu wamandla nobunzima xa kuthelekiswa nee-polymers zemveli.Umbhobho womlilo onemibhobho ye-PU, ulwelo lunokwenziwa lube mncinci kakhulu ngelixa lugcina amandla aphezulu okutsalwa kunye nokumelana nokukrweleka. Idatha evela kwiUMbutho weSizwe woKhuselo loMlilo (i-NFPA)icebisa ukuba ukunciphisa ubunzima bezixhobo zomlilo kuhambelana ngokuthe ngqo nokudinwa okunciphileyo kwabacimi-mlilo kunye namaxesha okuphendula aphucukileyo. Ii-PU linings zihlala ziguquguquka kakhulu nokuba kumaqondo obushushu aphantsi njenge--50°C, umda apho i-PVC ihlala iqhekeka kwaye ithambekele ekuqhekekeni.

Ukuthelekisa Ukusebenza Kokuhamba Kwamanzi kunye Nokulahlekelwa Yingxabano

Ukulahleka kwefriction yinto ebalulekileyo ekusebenzeni kwe-hydraulic, njengoko ilawula uxinzelelo olufumanekayo kwi-nozzle. Iilinings ze-polyurethane zenzelwe ukuba zigudise kakhulu, nto leyo ebangela ukuba i-Manning's roughness coefficient ibe sezantsi xa ithelekiswa ne-PVC. Ukungqubana okuphantsi kwangaphakathi kuvumela amazinga aphezulu okuhamba kwamanzi (GPM) kumgama omde ngaphandle kokufuna amandla ongezelelweyo okupompa. Kwi-high-riding fire delay, kusetyenziswa i-ipayipi yomlilo enoxinzelelo oluphezulunge-PU lining iqinisekisa ukuba ilahleko yokungqubana iyancitshiswa, nto leyo egcina amandla entshukumo yomjelo wamanzi ukuze kungene ilangabi ngempumelelo.

Ukulinganiswa koKuhlala ixesha elide kwiNdalo kunye nokuxhathisa ukurhawuzelelwa

Ijakethi yangaphandle yombhobho womlilo inika ukuqina kwesakhiwo, kodwa i-lining yangaphakathi kufuneka imelane nokukhula nokuxinana okuqhubekayo. I-linings ze-PU zibonisa ukumelana okuphezulu kwe-ozone kunye nozinzo lwe-UV, okuthintela ukuba izinto zingaboli xa zichatshazelwa lilanga okanye zingcolise izimboni kangangeminyaka eliqela. Ngokwezibalo zoshishino ezivela kwi-Ikamva loPhando lweMarike (MRFR), imakethi yepayipi yomlilo yehlabathi iya itshintsha iye kwi-TPU (Thermoplastic Polyurethane) ngenxa yokumelana kwayo nokurhawuzelelwa okuphezulu ngokuphindwe kathathu ukuya kahlanu xa kuthelekiswa ne-PVC eqhelekileyo. Olu qina lwenza i-PU ibe lolona khetho lukhethwayo kwiipayipi yomlilo yejakethi ephindwe kabiniizakhiwo ezisetyenziswa kwiindawo ezinzima ezifana nemigodi kunye namahlathi.

Ukuthelekiswa kweepayipi zomlilo ezine-PVC kunye ne-PU ezisetyenziswa kwimizi-mveliso

Le theyibhile ilandelayo ishwankathela imilinganiselo yokusebenza kobugcisa bee-lining ze-PVC kunye ne-PU ukunceda kwinkqubo yokukhetha izicelo zemizi-mveliso kunye nekamasipala:

Inkqubo Yokusebenza Yokuhlola Ukunyaniseka Kwepayipi Yomlilo

Ukuqinisekisa ukuthotyelwa kwemigangatho yokhuseleko efana ne-NFPA 1962, abaphathi beziko kufuneka balandele inkqubo yokuhlola ecwangcisiweyo kubo bonkeizixhobo zokulwa nomliloUkugcina ulusu luqinile kubalulekile ekuthinteleni ukusilela okukhulu ngexesha lomlilo.
1.

Uhlolo lwangaphandle olubonakalayo: Hlola ijakethi yangaphandle ukuba ayinamabala, itshile, okanye amabala eekhemikhali anokubonisa umonakalo kwingaphakathi.

2.

Ukujonga Umgca Wangaphakathi: Jonga ngepayipi ujonge kumthombo wokukhanya ukuze ubone naluphi na uqhekeko okanye ubumdaka ngaphakathiukudibanisa ipayipi yomliloindawo.

3.

Uvavanyo loxinzelelo lwe-Hydrostatic: Faka ipayipi kuxinzelelo lovavanyo olumiselweyo lwenkonzo ukuze ujonge ukuvuza okanye "ukubila" ngejakethi.

4.

Ukomisa kunye nokugcina: Qinisekisa ukuba ipayipi ikhutshiwe kwaye yomile ngokupheleleyo ngaphambi kokuba iqengqeleke ukuthintela ukukhula kwesikhunta, nto leyo ebaluleke kakhulu kwizinto ezisekwe kwi-PVC.

Uhlalutyo lweNzuzo-mali yoKuthenga uKhuseleko loMlilo lweXesha elide

Nangona ixabiso lokuqala lokuthenga ipayipi eline-PVC liphantsi, iTotal Cost of Ownership (TCO) idla ngokuthanda iPolyurethane. Ubomi benkonzo obude be-PU—obuphindaphindwa kabini kunobe-PVC—bunciphisa ukuphindaphinda kwemijikelo yokutshintshwa. Ngaphezu koko, ubunzima obuncitshisiweyo beepayipi ze-PU buvumela ukusetyenziswa kweepayipi ezincinci nezincinci.iireli zepayipi yomlilo, igcina indawo exabisekileyo kwizicwangciso zorhwebo. Kwimibutho ebeka phambili ukuthunyelwa ngokukhawuleza kunye nokuthembeka kwexesha elide, utyalo-mali kwi-PU lining esemgangathweni ophezulu lubonelela ngembuyekezo ephezulu ngokusebenzisa imida yokhuseleko ephuculweyo kunye nokunciphisa umsebenzi wokulungisa.

FAQ

Iilinings zePVC kunye nePolyurethane zahluke njani kwimilo yeekhemikhali kunye nempembelelo yokusingqongileyo?

I-PVC (iPolyvinyl Chloride) yiplastiki eqinileyo eyenziwe yaguquguquka ngokongezwa kwee-phthalates, ezinokuphuma ngokuhamba kwexesha, nto leyo ekhokelela ekuqineni kwezinto kunye neengxaki ezinokubakho kwindalo. Ngokwahlukileyo koko, iPolyurethane (PU) yi-elastomer ye-thermoplastic engadingi ukuba ii-plasticizers zihlale ziguquguquka. I-PU ngokubanzi ithathwa njengenobuhlobo nokusingqongileyo kwaye izinzile, njengoko ingakhuphi umsi onobuthi ngexesha lokuwohloka kobushushu obuphezulu ngokulinganayo ne-PVC. Ngokwembono yobuchwephesha, ulwakhiwo lwe-PU lwe-molecular luyivumela ukuba igcine ukuthamba kuluhlu olubanzi lobushushu kune-PVC.

Ithini inkqubo yenyathelo ngenyathelo yokutshintsha i-coupling yepayipi yomlilo eyonakeleyo?

Okokuqala, icandelo elonakeleyo lepayipi kufuneka lisikwe kakuhle kusetyenziswa isixhobo sokusika ipayipi esinzima, ukuqinisekisa ukuba ipayipi lithe nkqo kubude bepayipi. Okwesibini, icandelo elifanelekileyoiringi yokwandisa ipayipiokanye i-clamp kufuneka ikhethwe ngokusekelwe kububanzi bangaphakathi bepayipi. Okwesithathu, i-coupling shank entsha ifakwa kwipayipi ide ihlale ngokuqinileyo egxalabeni. Okwesine, kusetyenziswa isixhobo sokwandisa ukucinezela iringi yobhedu yangaphakathi kwi-lining, okwenza itywina loxinzelelo oluphezulu. Okokugqibela, indibano kufuneka ivavanywe nge-hydrostatic ngokuphindwe kayi-1.5 kuxinzelelo olusebenzayo ukuqinisekisa ukhuseleko lonxibelelwano ngaphambi kokuba lubuyiselwe kwinkonzo.

Ndingayikhetha njani i-lining efanelekileyo yepayipi yomlilo esetyenziswa kwiindawo eziphantsi kwe-zero?

Kwiindawo apho amaqondo obushushu ehla rhoqo ngaphantsi kweqhwa, iPolyurethane (PU) yeyona ndlela ifanelekileyo yokukhetha. Iilinki zePVC zidlula "kwinguqu yeglasi" kumaqondo obushushu aphantsi, ziqine kwaye zibe buthathaka; ukuzama ukuvula ipayipi yePVC eqandisiweyo kudla ngokubangela ukuba i-lining iqhekeke okanye yahlukane nejakethi yelaphu. Iilinki zePU zihlala zithambile kwaye zisebenza ukuya kuthi ga kwi -50°C (-58°F). Xa kucaciswa ipayipi yemozulu ebandayo, abathengi kufuneka baqinisekise isiqinisekiso se "Cold Bend Test" ngokwemigangatho ye-UL okanye ye-EN ukuqinisekisa ukuba izinto zihlala zisebenza kwiimeko zeArctic okanye eziphakamileyo.

Ziziphi iingcamango eziphosakeleyo eziqhelekileyo malunga nobunzima bepayipi yomlilo kunye novavanyo loxinzelelo?

Ingcamango ephosakeleyo eqhelekileyo kukuba ipayipi enzima netyebileyo inamandla ngokwemvelo okanye iyakwazi ukusingatha uxinzelelo oluphezulu. Kwisayensi yezinto zanamhlanje, ubukhulu abufani namandla. Iijakethi zepolyester eziqinileyo kunye nee-linings ze-PU ezibhityileyo nezixineneyo zinokufikelela kuxinzelelo olugqithisileyo kwi-900 PSI (62 Bar) ngelixa zinobunzima obungaphantsi kwama-30% kunepayipi eqhelekileyo yePVC. Enye ingcamango ephosakeleyo kukuba zonke iipayipi "zeplastiki" ziyafana; enyanisweni, uxinano lweemolekyuli zepolymer kunye nenkqubo yokubopha phakathi kwe-lining kunye nejakethi zimisela amandla epayipi okumelana "nokukrazuka" phantsi koxinzelelo oluphezulu.

Zithini iinkcukacha zedatha ezisemgangathweni zepayipi yomlilo ene-PU yodidi lobungcali?

Umbhobho ofakwe kwi-PU okumgangatho wobungcali uhlala unoxinzelelo olusebenzayo lwe-250-300 PSI kunye noxinzelelo oluqhumayo lwe-750-900 PSI ubuncinane. Ubukhulu be-lining buhlala buphakathi kwe-0.2mm kunye ne-0.4mm ukulinganisela ubunzima kunye nokuqina. Ngokwedatha evela kwiImigangatho yaseBritane (BS 6391)Iipayipi zohlobo lwe-3 (eziquka ii-PU coating okanye ii-linings) kufuneka zibonise ubunzima obuphezulu obumalunga ne-250g ukuya kwi-350g ngemitha nganye ububanzi obuyi-45mm. Ukongeza, amandla okunamathela phakathi kwe-lining kunye nelaphu kufuneka adlule kwi-10 lbs/intshi ukuthintela ukuqhekeka ngexesha lokutshintsha koxinzelelo ngokukhawuleza.