Yuav luag tag nrho cov yam tseem ceeb uas nkag mus rau hauv lub twj tso kua mis lub neej kev cia siab yog mus txog rau tus neeg siv kawg, tshwj xeeb tshaj yog li cas lub twj tso kua mis ua haujlwm thiab tswj xyuas. Yam dab tsi uas tus neeg siv kawg tuaj yeem tswj tau kom ntev lub neej ntawm lub twj tso kua mis? 13 yam tseem ceeb hauv qab no yog cov kev xav tseem ceeb rau kev txuas lub twj tso kua mis.

1. Radial Forces

Kev lag luam txheeb cais qhia tau hais tias qhov loj tshaj qhov ua rau lub sijhawm tsis tau npaj tseg rau cov twj centrifugal yog cov kabmob thiab / lossis cov tshuab foob tsis ua haujlwm. Cov kabmob thiab cov ntsaws ruaj ruaj yog "canaries nyob rau hauv lub thee mine" - lawv yog cov cim qhia ntxov ntawm kev noj qab haus huv ntawm lub twj tso kua mis thiab lub precursor rau tsis ua hauj lwm nyob rau hauv lub twj tso kua mis system. Txhua tus neeg uas tau ua haujlwm hauv kev lag luam twj tso kua mis rau lub sijhawm ntev npaum li cas tej zaum yuav paub tias thawj qhov kev coj ua zoo tshaj plaws yog kev ua haujlwm ntawm lub twj tso kua mis ntawm lossis ze ntawm Qhov Zoo Tshaj Lij Tshaj Tawm (BEP). Nyob rau ntawm BEP, lub twj tso kua mis yog tsim los tiv thaiv tsawg radial rog. Thaum khiav tawm ntawm BEP, qhov tshwm sim ntawm lub zog vector ntawm txhua lub zog radial yog ntawm 90 ° lub kaum sab xis rau lub rotor thiab sim deflect thiab khoov lub twj tso kua mis. Lub zog radial siab thiab qhov tshwm sim ntawm cov ncej deflection yog cov neeg kho tshuab foob tua neeg thiab ua rau muaj kev cuam tshuam rau lub neej luv luv. Yog tias lub zog radial loj txaus, lawv tuaj yeem ua rau cov ncej deflect lossis khoov. Yog tias koj nres lub twj tso kua mis thiab ntsuas cov ncej ntws, koj yuav pom tsis muaj dab tsi tsis ncaj ncees lawm vim qhov no yog qhov xwm txheej tsis zoo, tsis yog qhov zoo li qub. Ib tug bent ncej khiav ntawm 3,600 rpm yuav deflect ob zaug ib kiv puag ncig, yog li nws yuav khoov 7,200 zaug ib feeb. Lub voj voog siab no ua rau nws nyuaj rau lub ntsej muag foob kom muaj kev sib cuag thiab tswj cov txheej txheem dej (zaj duab xis) xav tau rau lub foob kom ua haujlwm zoo.

2. Lubricant Contamination

Rau cov kabmob pob, ntau dua 85% ntawm cov kabmob tsis ua haujlwm yog tshwm sim los ntawm kev sib kis, uas tuaj yeem ua hmoov av thiab txawv teb chaws lossis dej. Tsuas yog 250 qhov chaw ntawm ib lab (ppm) ntawm cov dej tuaj yeem txo qhov kev coj tus kheej los ntawm ib qho ntawm plaub. Lubricant lub neej tseem ceeb heev.

3. Kev nqus siab

Lwm yam tseem ceeb uas cuam tshuam rau kev coj tus kheej muaj xws li kev nqus siab, kev sib tw tsav tsheb, thiab qee yam yeeb nkab lim. Rau ANSI B 73.1 ib-theem kab rov tav overhung txheej txheem twj tso kua mis, lub axial quab yuam generated ntawm lub rotor yog mus rau qhov chaw nres nkoj suction, yog li rau qee qhov thiab nyob rau hauv qee qhov kev txwv, cov tshuaj tiv thaiv suction siab yuav txo tau cov axial quab yuam, yog li txo cov thrust bearing loads. thiab ncua lub neej ntawmtob zoo ntsug turbine twj tso kua mis.

4. Kev sib tw tsav tsheb

Misalignment ntawm lub twj tso kua mis thiab tus neeg tsav tsheb tuaj yeem overload lub radial bearing. Lub neej ntawm radial bearing yog exponentially cuam tshuam nrog cov degree ntawm misalignment. Piv txwv li, nrog ib tug me me misalignment (misalignment) tsuas yog 0.060 ntiv tes, tus neeg siv kawg yuav ntsib teeb meem los yog coupling teeb meem tom qab peb mus rau tsib lub hlis ntawm kev ua haujlwm. Txawm li cas los xij, yog tias qhov tsis zoo yog 0.001 ntiv tes, tib lub twj tso kua mis yuav ua haujlwm tau ntau dua 90 lub hlis.

5. Cov yeeb nkab lim

Cov yeeb nkab lim yog tshwm sim los ntawm misalignment ntawm lub tshuab nqus tsev thiab / lossis cov kav dej tawm nrog lub twj tso kua mis flanges. Txawm hais tias nyob rau hauv ib lub twj tso kua mis tsim, cov yeeb nkab lim tau yooj yim hloov cov kev ntxhov siab siab rau cov bearings thiab lawv cov kabmob sib raug zoo. Lub zog (strain) tuaj yeem ua rau cov kabmob haum tsis sib xws thiab / lossis tawm ntawm kev sib raug zoo nrog lwm cov kabmob, ua rau cov kab nruab nrab ntawm cov dav hlau sib txawv.

6. Cov khoom ua kua dej

Cov kua dej xws li pH, viscosity, thiab lub ntiajteb txawj nqus tshwj xeeb yog qhov tseem ceeb. Yog hais tias cov kua yog acidic los yog corrosive, ntws-los ntawm qhov chaw ntawm a tob zoo ntsug turbine twj tso kua mis xws li lub twj tso kua mis lub cev thiab impeller yuav tsum tau corrosion resistant. Cov ntsiab lus ntawm cov kua dej thiab nws qhov loj, zoo li, thiab abrasiveness yog txhua yam.

7. Kev siv ntau zaus

Kev siv ntau zaus yog lwm qhov tseem ceeb: Lub twj tso kua mis pib ntau npaum li cas hauv lub sijhawm? Kuv tus kheej tau pom cov twj uas pib thiab nres txhua ob peb feeb. Tus nqi hnav ntawm cov twj tso kua mis no ntau dua thaum lub twj tso kua mis khiav tsis tu ncua nyob rau hauv tib lub sijhawm. Hauv qhov no, tus qauv tsim yuav tsum tau hloov pauv.

8. Net Positive Suction Head Margin

Qhov ntau dua qhov nruab nrab ntawm Net Positive Suction Head Available (NPSHA, lossis NPSH) thiab Net Positive Suction Head Required (NPSHR, lossis NPSH Yuav Tsum Tau), qhov tsawg dua qhov dej tob. ntsug turbine twj tso kua mis yuav cavitate. Cavitation ua rau lub twj tso kua mis impeller puas, thiab qhov tshwm sim ntawm kev co tuaj yeem cuam tshuam rau lub neej ntawm cov ntsaws ruaj ruaj thiab bearings.

9. Pump ceev

Qhov ceev ntawm lub twj tso kua mis ua haujlwm yog lwm qhov tseem ceeb. Piv txwv li, lub twj tso kua mis khiav ntawm 3,550 rpm yuav hnav plaub mus rau yim zaus sai dua ib qho kev khiav ntawm 1,750 rpm.

10. Impeller Balance

Unbalanced impellers ntawm cantilever twj los yog qee qhov qauv ntsug tuaj yeem ua rau lub ntsej muag wobble, ib qho xwm txheej uas cuam tshuam lub ncej, zoo li radial rog thaum lub twj tso kua mis khiav tawm ntawm BEP. Radial deflection thiab ncej wobble tuaj yeem tshwm sim ib txhij.

11. Piping Arrangement thiab Inlet Flow Rate

Lwm qhov kev txiav txim siab tseem ceeb rau kev ncua lub neej twj tso kua mis yog li cas cov kav dej tau npaj, piv txwv li cas cov kua dej "loaded" rau hauv lub twj tso kua mis. Piv txwv li, lub luj tshib ntawm lub dav hlau ntsug ntawm qhov nqus ntawm lub twj tso kua mis yuav muaj kev cuam tshuam tsawg dua li lub luj tshib kab rov tav - lub hydraulic loading ntawm lub impeller yog ntau dua, thiab yog li ntawd cov bearings yog loaded ntau tusyees.

12. Pump ua haujlwm kub

Kev khiav hauj lwm kub ntawm lub twj tso kua mis, txawm tias kub los yog txias, thiab tshwj xeeb tshaj yog tus nqi ntawm qhov kub thiab txias hloov, tuaj yeem muaj kev cuam tshuam loj rau lub neej thiab kev ntseeg siab ntawm lub twj tso kua mis sib sib zog nqus ntsug turbine. Kev khiav hauj lwm kub ntawm lub twj tso kua mis yog ib qho tseem ceeb heev thiab lub twj tso kua mis yuav tsum tau tsim kom tau raws li qhov kub ntawm kev khiav hauj lwm. Tab sis qhov tseem ceeb tshaj yog qhov kev hloov ntawm qhov kub thiab txias.

13. Pump Casing Penetrations

Txawm hais tias tsis yog feem ntau txiav txim siab, vim li cas cov twj tso kua mis nkag yog ib qho kev xaiv es tsis yog tus qauv rau ANSI twj tso kua mis yog tias tus naj npawb ntawm cov twj tso kua mis nkag mus yuav muaj qee yam cuam tshuam rau lub neej ntawm lub twj tso kua mis, vim tias cov chaw no yog qhov chaw tseem ceeb rau corrosion thiab stress gradients (nce). Ntau tus neeg siv kawg xav kom lub casing yuav tsum tau drilled thiab tapped rau ntws, tso pa, instrumentation ports. Txhua lub sij hawm ib lub qhov drilled thiab tapping rau ntawm lub plhaub, ib qho kev ntxhov siab gradient tau tso rau hauv cov khoom, uas dhau los ua qhov chaw ntawm kev ntxhov siab tawg thiab qhov chaw pib corrosion.

Cov saum toj no tsuas yog rau cov neeg siv khoom siv. Yog xav paub ntxiv, thov hu rau CREDO PUMP.