Vim Li Cas Cov Khoom Siv Mechanical Seal Uas Tiv Thaiv Kev Kub Ntxhov Tseem Ceeb

Kev Taw Qhia

Hauv kev ua tshuaj lom neeg, kev ua kom huv, thiab lwm yam kev siv dej, kev ua tsis tiav ntawm lub foob feem ntau pib nrog kev xeb ua ntej pom qhov xau. Lub foob tiv thaiv kev xeb yog tsim los ua kom cov nplaim foob, cov khoom hlau, thiab elastomers ruaj khov thaum raug rau cov kua qaub, cov kuab tshuaj, hydrocarbons, thiab cov khoom siv abrasive. Nws tus nqi mus dhau lub neej ua haujlwm ntev dua: nws pab tswj cov pa phem, tiv thaiv kev ntseeg siab ntawm cov khoom siv, thiab txo qhov kev pheej hmoo ntawm kev kaw tsis tau npaj tseg lossis xwm txheej kev nyab xeeb. Cov lus sib tham hauv qab no piav qhia txog yuav ua li cas cov foob no txwv tsis pub xau, cov ntaub ntawv dab tsi ua rau lawv ua haujlwm tau zoo hauv qhov chaw nyuaj, thiab vim li cas lawv thiaj li tseem ceeb rau kev ua raws li txoj cai thiab kev ua haujlwm zoo.

Vim Li Cas Cov Khoom Siv Mechanical Seals Uas Tiv Thaiv Kev Kub Ntxhov Thiaj Tseem Ceeb

Hauv cov chaw ua tshuaj lom neeg thiab cov hydrocarbon uas ua rau muaj kev kub ntxhov, kev ua haujlwm ntawm lub tshuab ua haujlwm tig yog nyob ntawm nws cov txheej txheem kaw.lub tshuab foobtau tsim los kom tiv taus cov teebmeem ntawm cov kua dej ua haujlwm hnyav, ua lub hauv paus tseem ceeb tiv thaiv kev tso pa tawm thiab kev poob dej loj heev. Tsis zoo li cov foob txheem, uas yuav lwj sai sai thaum raug rau cov kua qaub, cov hauv paus, lossis cov khoom siv abrasive, cov qauv tiv taus corrosion tswj tau qhov tseeb ntawm lub ntsej muag thiab kev ua haujlwm ruaj khov hauv qab kev tawm tsam tshuaj lom neeg hnyav.

Lub luag haujlwm ntawm kev lag luam rau cov foob tshwj xeeb no yog tsav los ntawm cov cai ib puag ncig nruj thiab tus nqi siab ntawm lub sijhawm tsis tau npaj tseg. Piv txwv li, cov chaw ua haujlwm raws li EPA Txoj Kev 21 yuav tsum tswj cov pa phem uas tsis muaj zog hauv qab 500 feem ib lab (ppm), uas yog qhov ntsuas tsis yooj yim sua kom ua tiav yog tias cov khoom foob yaj lossis pitting. Los ntawm kev siv cov hlau metallurgy siab heev thiab cov elastomers ua tau zoo, cov foob tiv taus corrosion ua kom ntseeg tau tias cov chaw ua haujlwm ua tau raws li cov qauv kev ua raws cai thaum tiv thaiv cov neeg ua haujlwm los ntawm kev raug tshuaj lom lossis tshuaj lom.

Yuav ua li cas cov foob tiv taus corrosion txo qhov xau

Lub hauv paus ntsiab lus ua haujlwm ntawm lub tshuab foob yog nyob ntawm kev tswj cov kua dej me me ntawm ob lub ntsej muag foob uas ci ntsa iab heev. Txhawm rau tiv thaiv kev xau, cov ntsej muag no yuav tsum nyob tiaj tus kom txog li 2 txog 3 lub teeb helium (kwv yees li 0.000023 txog 0.000035 ntiv tes). Thaum lub foob tsis sib xws nrog cov kua dej txheej txheem, kev xeb sib xws lossis thaj chaw hloov pauv qhov chaw tseem ceeb no. Kev xeb pitting tsim cov channel me me thoob plaws lub ntsej muag foob, thaum kev xeb tawg tawm tsam cov grooves O-ring, tso cai rau cov kua dej txheej txheem hla dhau cov ntsiab lus sib khi dynamic thib ob.

Cov foob pob hluav taws xob uas tiv taus xeb txo cov hom kev ua tsis tiav no los ntawm kev siv cov khoom siv inert uas tsis cuam tshuam nrog cov khoom siv pumped. Los ntawm kev khaws cia qhov tiav tiav ntawm cov ntsej muag tseem ceeb thiab tswj hwm qhov ntev ntawm cov khoom siv hlau, cov foob pob hluav taws xob no tswj hwm qhov tuab ntawm cov kua dej zoo tshaj plaws. Qhov no tiv thaiv kev hloov pauv ntawm ciam teb lubrication mus rau kev sib txhuam qhuav, yog li tshem tawm qhov thermal distortion thiab blistering uas feem ntau ua ntej qhov xau loj heev.

Cov chaw ua haujlwm twg xav tau kev tiv thaiv corrosion

Qhov xav tau kev tiv thaiv tshuaj lom neeg zoo tshaj plaws npog ntau yam lag luam hnyav, tshwj xeeb tshaj yog qhov twg pH siab heev lossis muaj cov halide ntau. Hauv cov khoom siv chlor-alkali, cov khoom siv feem ntau siv cov roj chlorine ntub, sodium hypochlorite, thiab concentrated sodium hydroxide ntawm pH ntau dua 13. Cov hlau stainless 300-series txheem raug kev txom nyem sai sai chloride kev ntxhov siab corrosion tawg nyob rau hauv cov xwm txheej no, uas yuav tsum tau ua rau cov alloys txawv teb chaws.

Ib yam li ntawd,cov chaw ua haujlwm roj thiab roj av hauv hiav txwvua cov roj av qaub uas muaj cov hydrogen sulfide (H2S) thiab cov xuab zeb abrasive ntau. Cov chaw tsim cov ntawv pulp thiab ntawv vam khom cov dej cawv dub thiab chlorine dioxide bleaching stages, ib puag ncig uas muaj npe nrov rau kev ua rau muaj kev xeb hnyav. Hauv cov ntawv thov no, cov kua tshuaj dynamically tshem tawm cov txheej oxide passive ntawm cov hlau txheem, ua rau cov foob tiv thaiv corrosion-resistant yog qhov yuav tsum tau ua haujlwm kom tswj tau Lub Sijhawm Nruab Nrab Ntawm Kev Ua Tsis Tau Zoo (MTBF) txais tau rau kev tsim khoom tas mus li.

Dab Tsi Txhais Tau Ib Lub Tshuab Seal Uas Tiv Thaiv Kev Kub Ntxhov

Ib lub foob pob uas tiv taus xeb yog txhais los ntawm kev sib xyaw ua ke ntawm nws peb pawg tseem ceeb: lub ntsej muag tig thiab ruaj khov, cov khoom siv hlau, thiab cov foob pob elastomeric thib ob. Lub foob pob tsuas yog muaj zog npaum li nws cov khoom tsis muaj zog tshaj plaws; lub ntsej muag silicon carbide uas tiv taus siab heev yuav tsis muaj txiaj ntsig yog tias O-ring txhawb nqa o lossis lub phaj hlau yaj.

Cov ntaub ntawv ntsej muag, hlau, thiab elastomer twg cuam tshuam rau kev tiv thaiv xeb

Kev xaiv cov ntaub ntawv qhia txog lub neej ua haujlwm ntawm lub foob hauv cov xov xwm nruj. Rau cov ntsej muag tseem ceeb, Sintered Alpha Silicon Carbide (SiC) yog tus qauv kev lag luam rau kev tiv thaiv tshuaj lom neeg dav dav, tswj kev ruaj khov thoob plaws pH ntawm 0 txog 14. Hauv cov ntawv thov caustic heev uas SiC yuav ntsib kev tawm tsam ciam teb ntawm cov noob, cov qib tshwj xeeb lossis tungsten carbide (WC) nrog cov khoom siv nickel - es tsis yog cov khoom siv cobalt uas yooj yim xeb - raug siv.

Cov khoom siv hlau, suav nrog lub qog, lub tes tsho, thiab cov caij nplooj ntoos hlav, feem ntau xav tau kev hloov kho dua tshiab los ntawm tus qauv 316SS. Cov hlau nplaum siab xws li Hastelloy C-276, titanium, lossis Alloy 20 raug xa mus rau kev tawm tsam pitting thiab kev ntxhov siab corrosion cracking hauv chloride-nplua nuj lossis sulfuric acid ib puag ncig. Rau kev sib khi thib ob, elastomers yuav tsum tiv taus cov tshuaj o thiab extrusion. Perfluoroelastomers (FFKM) muab kev sib raug zoo tshuaj ze-universal, ua tau zoo dua tus qauv FKM lossis EPDM xaiv hauv cov ntawv thov hnyav.

Yuav ua li cas chemistry, kub, siab, thiab qhov ceev ntawm lub ncej cuam tshuam rau kev ua tau zoo

Kev tiv thaiv tshuaj lom neeg tsis yog ib yam khoom uas nyob ruaj khov; nws nyob ntawm ntau yam kev hloov pauv ua haujlwm. Tus qauv Arrhenius qhia tias tus nqi ntawm cov tshuaj lom neeg - suav nrog kev xeb - kwv yees li ob npaug rau txhua 10 ° C (18 ° F) nce hauv qhov kub. Ib qho hlau lossis elastomer uas ua pov thawj tias muaj kev tiv thaiv zoo rau 10% sulfuric acid kua ntawm qhov kub thiab txias yuav lwj sai sai ntawm 90 ° C. Yog li ntawd, cov kev ntsuas kub yuav tsum tau soj ntsuam nruj me ntsis nrog rau cov kua tshuaj.

Qhov siab thiab qhov ceev ntawm lub qhov (shaft) ua rau muaj kev pheej hmoo ntawm kev xeb ntau ntxiv los ntawm kev ua rau muaj kev ntxhov siab ntawm lub tshuab thiab kev tsim cua sov hauv zos. Kev siv qhov siab siab, feem ntau tshaj 1,200 psig hauv cov twj tso kua mis hnyav, ua rau muaj kev xeb sai dua los ntawm kev yuam cov kua dej kom tob dua rau hauv cov kab me me. Qhov ceev ntawm lub qhov (shaft) ua rau muaj kev txiav ntawm cov kua dej, ua rau qhov kub ntawm lub ntsej muag nce siab thiab ua rau cov tshuaj lom neeg tawm tsam ntawm lub ntsej muag ntawm lub foob, uas yog ib qho tshwm sim hu ua kev puas tsuaj ntawm thermo-chemical.

Yuav ua li cas kom paub qhov txawv ntawm kev ua tsis tiav ntawm corrosion los ntawm kev hnav thiab kev khiav qhuav

Kev tshuaj xyuas qhov tsis ua haujlwm kom raug yog qhov tseem ceeb rau kev tiv thaiv kev tawg rov qab. Kev paub qhov txawv ntawm kev xeb los ntawm kev hnav khoom siv lossis kev khiav qhuav yuav tsum tau tshuaj xyuas qhov kev puas tsuaj tshwj xeeb. Kev xeb feem ntau tshwm sim ua qhov pitting, kev nyias nyias ntawm cov khoom hlau, lossis kev leaching tshuaj. Piv txwv li, thaum cov cobalt binder hauv tungsten carbide ntsej muag raug leached tshuaj, lub ntsej muag zoo li tsis ci thiab xav tias ntxhib rau kov, ua rau muaj qhov chaw porous uas tsis tuaj yeem tswj tau cov kua dej.

Qhov sib txawv, kev khiav qhuav ua rau muaj kev puas tsuaj thermal sib txawv, xws li kev kuaj xyuas cua sov (cov kab nrib pleb me me ntawm lub ntsej muag foob) lossis cov kab mob loj heev ntawm cov ntsej muag carbon graphite. Kev hnav abrasive qhia txog qhov tob, concentric grooving raws cov npoo mating. Yog tias O-ring tsis ua haujlwm vim yog cov tshuaj tsis sib xws, nws yuav ua rau o, embrittlement, lossis extrusion, thaum thermal degradation feem ntau ua rau O-ring tawv nrog ib qho squared-off cross-section. Kev txheeb xyuas cov cim tshwj xeeb no ua kom ntseeg tau tias kev hloov kho seal tom qab daws qhov teeb meem tsis ua haujlwm raug.

Yuav Ua Li Cas Piv Cov Kev Xaiv Mechanical Seal Uas Tiv Thaiv Kev Kub Ntxhov

Kev nrhiav tau lub foob kom raug yuav tsum tau soj ntsuam ob qho tib si cov ntaub ntawv siv thiab cov khoom siv kho tshuab. Kev tsim lub cev ntawm lub foob qhia txog seb cov khoom sab hauv raug rau cov kua dej li cas, uas txhais tau tias kev xaiv cov qauv zoo qee zaum tuaj yeem txo qhov xav tau cov hlau kim tshaj plaws.

Cov qauv sib piv uas cov neeg yuav khoom yuav tsum siv

Cov neeg yuav khoom thiab cov kws ua haujlwm txhim khu kev qha yuav tsum soj ntsuam cov foob pob hluav taws uas tiv taus xeb siv cov txheej txheem kev siv tshuab thiab kev lag luam. Qhov ntsuas tseem ceeb yog Tus Nqi Siv Lub Neej (LCC), uas sib npaug cov peev nyiaj pib tawm tsam Lub Sijhawm Nruab Nrab Ntawm Kev Ua Tsis Tau Zoo (MTBF). Lub foob pob hluav taws zoo yuav raug nqi peb npaug ntau dua thaum xub thawj tab sis tuaj yeem ntev MTBF los ntawm 6 lub hlis mus rau ntau dua 36 lub hlis, txo cov nqi mus sij hawm ntev.

Kev ua raws li cov qauv kev lag luam, xws li API 682 (rau roj, roj av, thiab tshuaj lom neeg kev lag luam), yog lwm qhov tseem ceeb. Cov neeg yuav khoom yuav tsum qhia meej txog Qeb (1, 2, lossis 3) raws li qhov loj me thiab kub ntawm lub twj tso kua mis, thiab xaiv qhov kev npaj foob kom raug. Ntxiv mus, kev soj ntsuam cov peev xwm ntawm cov neeg muab khoom - xws li lawv lub peev xwm los muab EN 10204 3.1 daim ntawv pov thawj taug qab cov khoom siv - ua kom ntseeg tau tias cov hlau tsis xeb uas tau teev tseg ua tau raws li qhov yuav tsum tau ua ntawm cov hlau tsim nyog rau daim ntawv thov.

Cov foob ib leeg, ob npaug, daim cartridge, thiab cais sib txawv li cas

Qhov kev xaiv ntawm ib qho, ob qho, cartridge, thiab kev teeb tsa sib cais hloov pauv qhov kev sib cuam tshuam ntawm lub foob nrog qhov chaw corrosive. Ib qho foob vam khom cov kua dej uas tau pumped rau kev ua kom lubrication; yog li ntawd, txhua qhov khoom yuav tsum sib haum xeeb nrog cov xov xwm. Txawm hais tias ib qho foob muaj cov nqi pib qis dua, lawv tsis muab kev tswj hwm thib ob yog tias cov kua dej tseem ceeb tsis ua haujlwm.

Ob chav (dual) cov ntsaws ruaj ruajsiv cov kua dej thaiv uas muaj siab lossis tsis muaj siab nruab nrab ntawm ob pawg ntawm lub ntsej muag foob. Los ntawm kev tswj cov kua dej thaiv ntawm qhov siab dua li cov txheej txheem, lub ntsej muag foob sab hauv tau lubricated los ntawm cov kua dej thaiv huv, tsis muaj xeb es tsis yog cov tshuaj lom neeg ua haujlwm hnyav. Qhov kev teeb tsa no cais cov caij nplooj ntoos hlav thiab cov hlau sab hauv los ntawm qhov chaw xeb, tiv thaiv kev tawm tsam tshuaj lom neeg thiab ua kom tsis muaj pa phem.

Cov foob pob yog cov khoom uas tau sib dhos ua ntej uas muaj lub foob, lub qog, thiab lub tes tsho. Lawv tshem tawm qhov xav tau kev ntsuas kev teeb tsa kom raug, txo qhov yuam kev ntawm tib neeg thaum lub sijhawm txij nkawm - qhov tseem ceeb thaum tuav cov tshuaj lom neeg. Cov foob pob sib cais tso cai rau kev teeb tsa yam tsis tau rhuav tshem lub twj tso kua mis lossis lub cev muaj zog, uas yog qhov zoo heev rau cov khoom siv loj. Txawm li cas los xij, cov foob pob sib cais feem ntau muaj qhov txwv qis dua (feem ntau capped nyob ib ncig ntawm 150 psig) thiab tsis haum rau cov kua dej corrosive heev vim yog cov kab sib cais hauv lawv cov khoom elastomeric.

Yuav Xaiv Thiab Tiv Thaiv Lub Cim Kom Yog Li Cas

Txawm tias lub foob pob hluav taws xob uas tiv taus xeb zoo tshaj plaws los kuj yuav ua tsis tau ua ntej lub sijhawm yog tias siv tsis raug lossis raug rau cov xwm txheej ua haujlwm tsis zoo dhau ntawm nws cov qauv tsim. Kev siv tau zoo yuav tsum tau sau cov ntaub ntawv zoo thaum lub sijhawm yuav khoom, ua raws li kev coj ua zoo rau kev tswj hwm ib puag ncig thaum lub sijhawm ua haujlwm.

Cov pab pawg tsim cov ntaub ntawv thov thiab cov pab pawg yuav khoom xav tau dab tsi

Yuav kom paub meej tias lub foob zoo tshaj plaws, cov pab pawg engineering thiab cov neeg yuav khoom yuav tsum sau cov ntaub ntawv thov kom tiav. Cov kua dej yuav tsum tau muab sau kom meej, suav nrog cov khoom me me thiab cov xwm txheej ib ntus, vim tias tsuas yog 1% ntawm hydrofluoric acid lossis chlorides tuaj yeem hloov pauv qhov sib xws ntawm cov khoom siv. Lub zog tshwj xeeb, lub zog vapor, thiab viscosity ntawm qhov kub thiab txias ua haujlwm (uas feem ntau tuaj yeem tshaj 400 ° F / 204 ° C hauv kev ua tshuaj lom neeg) yuav tsum tau sau tseg.

Cov ntaub ntawv txog cov khoom siv kho tshuab kuj tseem ceeb ib yam nkaus. Cov pab pawg yuav tsum muab qhov ceev ntawm lub twj tso kua mis (RPM), qhov loj ntawm lub thawv ntim khoom, thiab qhov ua tau zoo ntawm cov khoom siv. Rau lub foob ua haujlwm tau zoo kom ua haujlwm tau zoo, qhov khiav tawm ntawm lub twj tso kua mis feem ntau yuav tsum tsis pub tshaj 0.002 ntiv tes Tag Nrho Cov Ntawv Nyeem (TIR), thiab qhov kawg ntawm lub qhov yuav tsum khaws cia kom qis dua 0.005 ntiv tes. Yog tsis muab cov ntaub ntawv txog cov khoom siv raug, ua rau cov qauv foob uas raug kev co ntau dhau, ua rau cov txiaj ntsig ntawm cov khoom siv tiv taus xeb tsis zoo.

Kev kuaj, cov qauv, thiab kev txhawb nqa ntawm cov neeg muab khoom cuam tshuam li cas rau kev xaiv

Kev txhawb nqa los ntawm cov neeg muab khoomthiab kev ua raws li cov qauv kev xeem nruj ua pov thawj qhov kev ntseeg tau ntawm lub foob xaiv. Cov chaw tsim khoom muaj koob npe raug kuaj hydrostatic rau lawv cov foob, feem ntau ntawm 1.5 npaug ntawm qhov siab tshaj plaws tsim, kom ntseeg tau tias muaj kev ncaj ncees ntawm cov khoom siv hlau thiab O-ring grooves nyob rau hauv kev ntxhov siab. Kev xeem kev tsim nyog raws li API 682 cov lus qhia ua piv txwv cov xwm txheej ua haujlwm dynamic, muab cov pov thawj ntawm cov nqi xau ntawm lub foob thiab kev ruaj khov thermal.

Tsis tas li ntawd xwb, kev txhawb nqa los ntawm tus neeg muag khoom yog qhov tseem ceeb rau kev daws teeb meem kev sib pauv khoom siv nyuaj. Tus neeg muag khoom uas paub txog yuav tsis tsuas yog muag cov hlau kim kim xwb tab sis yuav tshuaj xyuas lub kaw lus kom paub seb qhov kev hloov pauv tsim - xws li hloov ntawm ib lub foob mus rau ob lub foob nrog cov kua dej tshwj xeeb - yuav muab kev tiv thaiv zoo dua thiab lub neej ntev dua li kev cia siab rau cov hlau txawv teb chaws xwb.

Cov kev coj ua twg uas kev teeb tsa, kev yaug, thiab kev saib xyuas ua rau lub neej ntawm lub foob ntev dua

Lub neej ua haujlwm ntawm lub foob tiv taus xeb tau ntev dua los ntawm kev siv API Piping Plans kom tswj tau qhov chaw ib puag ncig ntawm lub foob. Rau cov foob ib leeg uas tuav cov kua xeb nrog cov khoom khov kho, API Plan 32 muab kev ntxuav tas mus li ntawm cov kua sab nraud huv si, sib xws, thawb cov xov xwm tawm ntawm lub ntsej muag foob thiab lub caij nplooj ntoo hlav.

Rau cov foob ob chav uas tuav cov tshuaj lom lossis cov tshuaj corrosive heev, API Plan 53A, 53B, lossis 53C raug xa mus rau kev muab cov kua dej thaiv siab.

Yuav Ua Li Cas Thiaj Paub Txog Kev Nqis Peev Hauv Lub Tshuab Seal Uas Tiv Thaiv Kev Kub Ntxhov

Cov Ntsiab Lus Tseem Ceeb

• Cov lus xaus tseem ceeb tshaj plaws thiab cov laj thawj rau kev foob kho tshuab tiv taus corrosion
• Cov lus qhia tshwj xeeb, kev ua raws li txoj cai, thiab kev kuaj xyuas kev pheej hmoo uas tsim nyog lees paub ua ntej koj cog lus
• Cov kauj ruam tom ntej thiab cov lus ceeb toom uas cov nyeem ntawv tuaj yeem siv tau tam sim ntawd

Cov Lus Nug Feem Ntau

Dab tsi ua rau lub foob pob hluav taws xob tiv taus xeb?

Nws siv cov ntaub ntawv ntsej muag sib xws, cov khoom hlau, thiab elastomers. Cov kev hloov kho tshiab feem ntau suav nrog SiC ntsej muag, Hastelloy lossis titanium kho vajtse, thiab FFKM lossis elastomers tsim nyog phim rau cov kua dej pumped.

Thaum twg kuv thiaj xav tau lub foob pob hluav taws xob uas tiv taus xeb?

Siv ib qho rau cov kua qaub, cov tshuaj caustic, cov tshuaj chlorides, cov kua qaub, cov kuab tshuaj, lossis cov khoom siv sib xyaw. Nws yog qhov tseem ceeb tshwj xeeb hauv cov tshuaj lom neeg, roj thiab roj av, kev khawb av, cov ntawv thiab cov ntawv, cov twj tso kua dej hauv hiav txwv, thiab cov twj kho dej.

Kev tiv thaiv corrosion txo qhov xau ntawm lub foob li cas?

Nws tiv thaiv kev tawg, kev tawg, thiab kev puas tsuaj ntawm elastomer uas cuam tshuam rau lub ntsej muag ntawm lub foob. Qhov ntawd pab tswj cov kua dej nyias nyias, txo cov cua sov sib sau ua ke, thiab tswj cov pa tawm thiab cov pa phem.

Cov ntaub ntawv twg feem ntau raug xaiv rau kev siv tshuaj lom neeg hnyav?

SiC siv dav rau cov ntsej muag foob. Tej zaum cov khoom hlau yuav xav tau Hastelloy C-276, Alloy 20, lossis titanium, thaum FFKM, FKM, lossis EPDM raug xaiv raws li kev raug tshuaj lom neeg thiab qhov kub thiab txias.

Puas yog Victor Seals muab cov khoom hloov pauv uas tiv taus xeb rau OEM twj tso kua mis?

Yog. Victor Seals muab cov khoom siv kho tshuab uas siv tau rau OEM thiab hloov tau rau cov hom lag luam xws li IMO, Alfa Laval, Grundfos, APV, Flygt, Fristam, Lowara, thiab Allweiler rau kev saib xyuas thiab kho.