Lub thickness ntawm lub sheath, los yog lub tsho sab nrauv, ntawm lub stainless hlau cartridge rhaub yog ib qho tseem ceeb tsim parameter uas ncaj qha cuam tshuam nws cov neeg kho tshuab lub zog, thermal efficiency, corrosion kuj, kev ruaj ntseg, thiab kev pab lub neej. Xaiv qhov zoo thickness yuav tsum tau ua tib zoo sib npaug ntawm kev ua tau zoo, kev nyab xeeb, thiab tus nqi -kev ua tau zoo. Cov hauv qab no yog ib qho kev ntsuam xyuas tag nrho ntawm cov ntsiab lus tseem ceeb cuam tshuam rau lub thickness ntawm cov sheath thiab cov lus pom zoo rau kev tshaj lij.
Qhov kev xaiv tsis yog tus nqi ruaj khov tab sis feem ntau yog txiav txim siab los ntawm plaub qhov kev ua haujlwm tseem ceeb: kev ua haujlwm siab, kev ua haujlwm kub, nruab nrab yam ntxwv, thiab lub zog ntom ntom (nto load). Rau cov txheej txheem atmospheric siab ib puag ncig, xws li qhib ntim lossis cov khoom siv, lub thickness ntawm 0.3 thiab 0.8 hli feem ntau txaus. Hauv nruab nrab mus rau qis- qhov chaw siab (0.5 - 3 MPa), zoo li cov uas pom nyob rau hauv qis - siab boilers lossis hydraulic systems, qhov ntau ntawm 0.8 mus rau 1.5 mm yog pom zoo. Rau siab- cov ntawv siv siab tshaj 3 MPa, lub thickness ntawm 1.5 mus rau 3.0 mm los yog ntau tshaj yog tsim nyog, thiab qhov no yuav tsum tau nruj me ntsis xam thiab validated raws li lub siab hlab ntsha qauv.
Kev khiav hauj lwm kub plays lub luag haujlwm tseem ceeb. Tsawg- daim ntawv thov kub qis dua 200℃feem ntau siv cov sheaths los ntawm 0.5 mus rau 1.0 mm tuab. Rau nruab nrab kub nruab nrab ntawm 200℃thiab 500 degree, ib tug tuab ntawm 1.0 mus rau 1.5 mm yog ntau, nrog rau kev xav rau thermal expansion. High-kev siv kub siab tshaj 500℃xav tau cov ntaub tuab tuab, los ntawm 1.5 txog 2.5 hli, kom txaus cov khoom nkag thiab oxidation ntawm qhov kub siab.
Qhov xwm ntawm qhov nruab nrab rhuab yog qhov tseem ceeb. Rau cov uas tsis yog -corrosive media xws li dej huv, cua, lossis roj, lub thickness ntawm 0.5 mus rau 1.2 hli yuav haum. Thaum soj ntsuam nrog cov xov xwm corrosive xws li acids, alkalis, los yog ntsev tov, ib tug tuab ntawm 1.0 mus rau 2.0 hli yog advisable, ua ke nrog rau kev xaiv ntawm ib tug siab dua - qib stainless hlau zoo li 316L thiab qhov sib ntxiv ntawm "corrosion allowance." Abrasive xov xwm uas muaj cov khoom uas yuav tsum tau txawm tias cov ntaub tuab tuab, los ntawm 1.2 mus rau 2.5 hli, txhawm rau txhim kho hnav tsis kam.
Thaum kawg, lub hwj chim ceev, los yog lub wattage dissipated ib cheeb tsam ntawm lub sheath nto, yuav tsum tau txiav txim siab. Tsawg nto loads qis dua 10 W / cm² pub rau nyias nyias ntawm 0.5-1.0 hli. Nruab nrab loads ntawm 10 thiab 20 W / cm² feem ntau xav tau 1.0-1.5 hli. Rau cov khoom siv siab tshaj 20 W / cm², lub thickness ntawm 1.5-2.0 hli yuav pab tiv thaiv kom tsis txhob muaj overheating, deformation, los yog kub hnyiab ntawm phab ntsa sheath.
Cov ntawv thov ib txwm muab cov ntaub ntawv siv tau. Hauv cov khoom siv hauv tsev xws li cov kav dej lossis lub tshuab kas fes siv cov dej huv ntawm atmospheric siab, sheaths ntawm 304 stainless hlau nrog lub thickness ntawm 0.4-0.8 hli yog tus qauv. Instant water heaters, ntsib dej siab, feem ntau siv 0.8-1.2 hli tuab 316L stainless hlau. Rau cov khoom siv xws li yas txhaj tshuaj molding tshuab, lub thickness ntawm 1.0-1.8 hli yog ntau. Tshuaj reactor cua sov nyob rau hauv corrosive ib puag ncig tej zaum yuav xav tau 1.5-2.5 hli sheaths ua los ntawm 316L los yog duplex stainless hlau. Cov ntawv thov hauv cov khoom noj khoom haus, tshuaj, thiab cov khoom lag luam semiconductor muaj cov cai tshwj xeeb, feem ntau yuav tsum muaj 316L stainless nrog polished tiav thiab thicknesses li ntawm 0.8 mus rau 1.8 hli, xaiv kom ua tau raws li kev tu cev nruj lossis purity qauv.
Cov txheej txheem tsim qauv engineering rau cov ntawv thov tseem ceeb suav nrog kev suav tseeb. Rau ib puag ncig siab, cov qauv zoo li ASME BPVC lossis GB / T 150 muab cov qauv rau phab ntsa yam tsawg kawg nkaus, xws li: `t=(PD) / (2 SE - 0.2 P) + C`, qhov twg `t` yog qhov ntsuas thickness, `P` yog tsim siab, `D` yog sab nraud, 'S' yog qhov tso cai rau kev ntxhov siab ntawm cov khoom siv, kev sib koom ua ke yog qhov ua kom zoo corrosion, ldC. Qhov nyiaj pub no yog qhov tseem ceeb ntxiv, feem ntau 0.3-2.0 hli, txiav txim siab los ntawm qhov xav tau corrosion thiab lub neej kev pab cuam xav tau.
Kev xaiv cov khoom sib cuam tshuam nrog thickness. Cov ntaub ntawv zoo tshaj plaws tuaj yeem tso cai txo qhov tuab. Piv txwv li, 316L stainless hlau zoo dua corrosion kuj piv rau 304 yuav tso cai rau ib tug me me corrosion pub. High- qib kub zoo li 310S muaj lub zog ntau dua ntawm qhov kub thiab txias, uas tuaj yeem ua rau phab ntsa nyias nyias hauv siab - cov ntawv siv cua sov. High- lub zog duplex stainless hlau tuaj yeem pab txhawb kev tsim qauv hauv qab kev ntxhov siab, txawm tias tus nqi siab dua.
Nrhiav qhov sib npaug yog qhov tseem ceeb. Ib lub hnab uas nyias nyias yuav ua rau lub tshuab tsis ua haujlwm, txo qhov kev tiv thaiv corrosion, thiab kub hnyiab- dhau ntawm lub zog siab lossis siab. Conversely, ib tug tuab heev sheath incurs ntau dua cov nqi khoom, nce thermal inertia (slows teb lub sij hawm), nce kev tsim complexity, thiab ntxiv qhov ceeb thawj thiab tej khoom rau lub rooj sib txoos.
Hauv cov ntsiab lus, rau feem ntau ntawm cov ntawv thov kev lag luam thiab kev lag luam, lub plhaub tuab ntawm 0.8 txog 1.5 hli sawv cev rau kev nyab xeeb, muaj txiaj ntsig, thiab feem ntau xaiv ua haujlwm. Lub hauv paus ntsiab lus yog los xyuas kom meej txhua yam kev ncaj ncees thiab kev nyab xeeb ua ntej, thaum tom qab ntawd optimizing rau thermal efficiency thiab kev lag luam. Rau txhua daim ntawv thov uas muaj siab, kub siab, lossis muaj zog corrosion, kev xaiv yuav tsum tsis txhob cia siab rau kev paub ib leeg; nws yuav tsum tau kev suav engineering suav nrog qhov tsim nyog kev nyab xeeb margins thiab kev tiv thaiv corrosion. Rau qhov tseem ceeb lossis tsis yog- daim ntawv thov tus qauv, kev sab laj nrog cov chaw tsim khoom siv cua sov lossis tus kws tshaj lij engineers thiab ua cov qauv kev sim yog xav kom txiav txim siab qhov zoo tshaj plaws specification. Tsis tas li ntawd, cov cua sov ua haujlwm hauv cov xwm txheej hnyav yuav tsum tau tshuaj xyuas tsis tu ncua rau cov cim ntawm corrosion, thinning, lossis deformation. Thaum kawg, xaiv qhov raug sheath thickness yog kev txiav txim siab ntau yam kev sib koom ua ke ntawm cov khoom siv science, thermodynamics, mechanics, thiab kev tswj tus nqi, tsim lub hauv paus rau lub sijhawm ntev -, ruaj khov, nyab xeeb, thiab ua haujlwm zoo ntawm cov khoom siv.
