Lub rhaub dej kub ntev ua los ntawm cov hlau tuaj yeem ua rau hnyav thiab ua tsis taus pa rau nruab, tshwj xeeb tshaj yog nyob rau hauv cov nyiaj siv ua haujlwm lossis nruj- qhov chaw nkag. PTFE cov cua sov, los ntawm qhov sib txawv, yog qhov xav tsis thoob. Qhov sib txawv no tshwm sim los ntawm qhov tseem ceeb ntawm cov khoom siv thiab muaj qhov tiag -kev cuam tshuam hauv ntiaj teb rau kev teeb tsa, tuav, thiab kev txhawb nqa tshuab.
Kev sib piv ceev: PTFE Versus Common Hlau Sheath Materials
Qhov ntom ntom - qhov loj ntawm ib chav tsev ntim ntawm cov khoom siv - ncaj qha txiav txim siab qhov hnyav ntawm lub rhaub dej kub ntawm qhov loj me. PTFE muaj qhov ceev ntawm kwv yees li2.15 mus rau 2.20 grams ib cubic centimeter (g / cm³). Stainless hlau, ib qho ntawm feem ntau cov hlau sheath cov ntaub ntawv rau industrial immersion rhaub, muaj ib tug ceev ntawm roughly7.8-8.0g / cm3. Incoloy (ib nickel-hlau-chromium alloy) yog me ntsis denser ntawm kwv yees li 8.1 txog 8.4 g / cm³. tooj liab, siv nyob rau hauv ib co tshwj xeeb cua sov, muaj ib tug ceev ntawm txog 8.96 g / cm³.
Lub PTFE sheath ntawm tib txoj kab uas hla thiab phab ntsa thickness yog li ntawd hnyav ib ncig ntawm ib tug -quarter ntau npaum li ib stainless hlau sheath. Piv txwv li, 1-meter ntev ntawm PTFE tubing nrog ib txoj kab uas hla 20 hli txheej thiab 2 hli phab ntsa thickness hnyav kwv yees li 0.25 kg, hos ib tug zoo tib yam stainless hlau raj hnyav ib ncig ntawm 0.95 kg. Qhov plaub-fold qhov hnyav qhov sib txawv no ntsuas linearly nrog ntev.
Qhov hnyav cuam tshuam rau kev siv lub tshuab rhaub thiab cov ntsiab lus tseem ceeb
Nws yog tsim nyog xav tias PTFE immersion rhaub tsis yog ua los ntawm PTFE nkaus. Cov khoom cua kub muaj cov hlau tsis muaj hlau (feem ntau yog npib tsib xee-chromium los yog tooj liab-nickel alloy) embedded nyob rau hauv los yog ib puag ncig los ntawm PTFE. Qee cov qauv tsim kuj suav nrog cov tub ntxhais hlau lossis lub tsheb npav rau kev txiav hluav taws xob. Cov khoom siv hlau no ntxiv qee qhov hnyav rau kev sib dhos tag nrho.
Txawm li cas los xij, lubPTFE rhaub qhov hnyav vs hlau sheathKev sib piv tseem muaj txiaj ntsig zoo rau PTFE. Cov tub ntxhais hlau yog qhov me me nyob rau hauv ntim piv rau cov khoom siv sheath, tshwj xeeb tshaj yog nyob rau hauv cov cua kub ntev dua qhov uas cov sheath yog feem ntau ntawm sab nraud ntim. Ib qho ua tiav PTFE-sheathed rhaub ntawm qhov muab lub zog ntsuas thiab qhov ntev feem ntau hnyav li ntawm 30% thiab 40% ntawm qhov sib npaug tag nrho-hlau-sheathed rhaub (stainless steel lossis Incoloy) nrog tib lub cev qhov ntev.
| Cua sov hom | Sheath Material | Kwv yees qhov hnyav ib Meter (20 hli OD, 2 hli phab ntsa, tsis suav nrog cov xaim sab hauv) | Qhov hnyav txheeb ze (PTFE=1 ×) |
|---|---|---|---|
| PTFE-puab | PTFE (qhov ceev 2.2 g / cm³) | ~ 0.25 kg | 1× |
| Stainless hlau sheathed | SS 316 (qhov ceev 8.0 g / cm³) | ~ 0.95 hli | ~3.8× |
| Incoloy-sheathed | Incoloy 800 (qhov ceev 8.1 g / cm³) | ~ 0.96 kg | ~3.8× |
| Copper-sheathed | Tooj liab (qhov ceev 8.96 g / cm³) | ~ 1.06 kg | ~4.2× |
Lus Cim: Qhov ntsuas kub tiag tiag suav nrog cov xaim hluav taws xob sab hauv thiab kev txiav tawm, tab sis qhov sib piv ntawm qhov sib txawv tseem zoo sib xws.
Tswv yim tuav tau txiaj ntsig thaum nruab
Ib qho tseem ceeb kom zoo dua ntawm qhov hnyav ntawm PTFE cua sov yog qhov yooj yim ntawm kev tuav thaum lub sij hawm installation. Lub 3-meter ntev stainless hlau immersion rhaub tuaj yeem hnyav 5 kg lossis ntau dua, yuav tsum muaj ob lub installers lossis cov cuab yeej nqa khoom kom muaj kev nyab xeeb. Lub PTFE rhaub ntawm tib qhov ntev thiab txoj kab uas hla yog kwv yees li 1.3 kg, uas tuaj yeem yooj yim los ntawm ib tus kws tshaj lij.
Qhov kev txo qhov hnyav no txhais ua ntau yam txiaj ntsig:
Txo lub cev strain ntawm cov neeg ua haujlwm installation- Kev nqa thiab ua haujlwm ntev, hnyav cua sov rau hauv txoj haujlwm, tshwj xeeb tshaj yog los ntawm kev qhib lub tank lossis saum cov catwalks, tsis tshua muaj zog thiab ua rau muaj kev pheej hmoo qis dua los yog ua rau lub tshuab ua kom puas.
Yooj yim mounting thiab txhawb kev xav tau- Cov khoom siv hluav taws xob sib zog ua kom qis qis qis ntawm lub tank rims, flanges, mounting brackets, thiab bulkhead fittings. Hauv cov tank yas lossis nyias- cov hlab ntsa, qhov kev txo qis no txo qis qhov kev pheej hmoo ntawm flange nkag los yog hauv cheeb tsam kev ntxhov siab tawg.
Kev kho kom haum thiab kho kom yooj yim dua- Tso lub teeb PTFE lub rhaub kom ua tiav qhov zoo tshaj plaws immersion qhov tob lossis tshem tawm ntawm phab ntsa tank yuav tsum tau siv zog tsawg dua thiab feem ntau tuaj yeem ua yam tsis muaj cuab yeej.
Hauv kev xyaum, pab pawg saib xyuas feem ntau tshaj tawm tias hloov cov hlau ua tsis tau tiav - sheathed rhaub nrog PTFE lub rhaub ntawm qhov sib piv lub zog ntsuas tau ua rau cov txheej txheem kev teeb tsa yooj yim dua, txawm tias PTFE lub rhaub yog lub cev ntev dua (ib qho txiaj ntsig ntawm qhov qis dua tso cai watt sib tham hauv cov lus dhau los).
Kev poob phaus yog qhov tseem ceeb tshaj plaws rau cov khoom siv hluav taws xob loj, ntev dua
Qhov hnyav kom zoo dua ntawm PTFE tau nce zuj zus ntxiv thaum lub rhaub ntev nce. Ib tug 6-meter (kwv yees li 20-ko taw) PTFE immersion rhaub yuav hnyav 2.5 kg, whereas ib tug sib npaug stainless hlau rhaub yuav hnyav ze li ntawm 10 kg. Rau cov cua kub ntev heev uas siv hauv cov tso tsheb hlau luam sib sib zog nqus lossis plating da dej, qhov sib txawv no tuaj yeem txiav txim siab seb qhov kev teeb tsa yuav tsum muaj lub hoist, scaffolding tshwj xeeb, lossis ob -tus neeg tuav.
Tsis tas li ntawd, cov nqi thauj khoom ncaj qha cuam tshuam los ntawm qhov hnyav. Ib lub pallet uas muaj kaum lub tshuab cua sov PTFE tuaj yeem hnyav 70% tsawg dua li tib yam ntawm cov hlau-cov khoom siv hluav taws xob sheathed, txo cov nqi thauj khoom thiab ua rau huab cua freight xaiv rau kev hloov ceev.
Kev txwv thiab kev txiav txim siab
Thaum qhov qis qis ntawm PTFE cov cua sov yog qhov muaj txiaj ntsig zoo, qee qhov kev ceeb toom tseem ceeb yog qhov tsim nyog. PTFE yog cov khoom muag muag piv rau cov hlau. Lub teeb yuag sheath muaj kev cuam tshuam ntau dua rau kev sib tsoo, tawg, lossis xuas nrig thaum tuav hnyav. Cov txheej txheem kev teeb tsa yuav tsum yog li ntawd hais txog kev ua tib zoo tuav- tsis txhob rub lub rhaub hla cov ntug ntawm lub tank ntse lossis nce mus rau hauv lub tsho-txawm tias lub teeb yuag tuaj yeem txhawb kev kho mob ib yam nkaus.
Tsis tas li ntawd, vim tias cov cua sov PTFE sib dua, lawv yuav tsis hnov zoo li "tseem ceeb" li cov cua sov hlau. Qhov kev nkag siab no qee zaum ua rau muaj kev txhawj xeeb txog kev ua haujlwm ntev, tab sis cov khoom siv hluav taws xob zoo PTFE muaj zog thaum ua haujlwm raug thiab muaj cov tshuaj tiv thaiv zoo dua.
Xaus: Lub teeb yuag tsim yooj yim rau kev txhim kho thiab txo cov kev txhawb nqa
Qhov sib txawv ntawm qhov sib txawv ntawm PTFE (≈2.2 g / cm³) thiab cov ntaub ntawv hlau xws li stainless hlau (≈8.0 g / cm³) txhais tau hais tias lub PTFE lub rhaub ntawm qhov sib npaug hnyav kwv yees li ib feem peb ntawm ntau npaum li nws cov khoom siv hlau. Qhov kev txo qhov hnyav no yog qhov tseem ceeb tshaj plaws rau cov cua sov ntev, qhov uas tuav thiab kev sib tw ua kom nyuaj.
Lub teeb yuag ntawm PTFE cov cua sov ua kom yooj yim rau kev teeb tsa-ua kom tus kws kho mob ib leeg tuav, txo qis, thiab txo qis cov kev xav tau ntawm cov khoom siv hluav taws xob ntawm lub tank rims thiab brackets. Cov nqi thauj khoom kuj raug txo. Kev xaiv cov khoom siv rau immersion heaters cuam tshuam tsis yog tsuas yog tshuaj lom neeg sib raug zoo thiab thermal kev ua tau zoo tab sis kuj tseem siv tau cov khoom siv xws li qhov hnyav, tuav yooj yim, thiab cov khoom siv kho vajtse mounting. Rau cov ntawv thov uas nquag hloov cov cua sov, kev teeb tsa nyiaj siv ua haujlwm, lossis kev tsim lub tank sib sib zog nqus, qhov ntom ntom ntawm PTFE muaj qhov pom tseeb thiab muaj txiaj ntsig zoo.
