Orifice phaj flowmeter tseem yog ib qho ntawm cov khoom siv dav siv hauv kev ntsuas kev lag luam. Lawv yog cov yooj yim, muaj zog, pheej yig, muaj ntaub ntawv zoo nyob rau hauv cov qauv thoob ntiaj teb, thiab muaj pov thawj nyob rau hauv cov kua, gases, thiab chav. Tab sis "orifice phaj" tsis yog ib qho khoom siv. Cov duab bore, ntug inlet, thiab lub hom phiaj ua haujlwm txhua yam hloov pauv li cas lub phaj coj mus rau hauv ib txoj kab tiag tiag, thiab xaiv qhov tsis ncaj ncees lawm style rau qias neeg, khov, los yog ob-phase kua yog ib qho ntawm feem ntau thiab feem ntau zam tsis tau ntawm qhov sib txawv ntawm qhov sib txawv siab thiab kev nyeem ntawv ntws.
Phau ntawv qhia no piav qhia seb hom phaj loj ntawm lub qhov rooj sib txawv li cas, qhov twg txhua tus feem ntau siv, yuav ua li cas engineers xaiv ntawm lawv, thiab cov qauv thiab cov ntaub ntawv twg koj xav tau ua ntej sizing. Yog tias koj tseem txiav txim siab ntawm cov thev naus laus zis ntau dua li ntawm cov qauv phaj, nws kuj tseem pab kom pib los ntawm qhov davCov ntsiab lus ntawm lub ntsiab flow meter homua ntej nqaim.
Dab tsi yog Orifice Plate Flow Meter?
Lub orifice phaj flow meter yog qhov sib txawv siab (DP) flow meter. Ib lub phaj nyias uas muaj lub tshuab ua tau zoo yog clamped ntawm flanges hauv cov yeeb nkab. Raws li cov kua ua kom nrawm dua los ntawm lub qhov me me, nws lub siab zoo li qub poob. Lub siab sib txawv thoob plaws lub phaj nce nrog roughly square ntawm tus nqi txaus, yog li ntsuas qhov sib txawv tso cai rau cov ndlwg los xam. Kev sib raug zoo ntawm qhov sib txawv siab thiab ntws yog ib qho ntawm cov qauvcov txheej txheem siv los xam cov raj xa dej.
Cov pa tawm coefficient uas txuas DP mus rau ntws yog nyob ntawm tus lej Reynolds, qhov sib piv beta (dhau txoj kab uas hla muab faib los ntawm cov yeeb nkab hauv txoj kab uas hla), thiab lub siab tapping kev npaj. Qhov kev cia siab ntawd yog qhov tseeb vim li cas ntau lub phaj sib txawv muaj nyob es tsis yog ib lub phaj universal.
Ib qho ua tiav orifice metering point feem ntau suav nrog:
- Lub hauv paus ntsiab lus (lub orifice phaj) thiab orifice flanges los yog ib tug meter khiav
- Upstream thiab downstream siab tappings
- A Differential siab transmitterraws li cov khoom siv thib ob
- Kev xaiv qhov kub thiab txias, qhov tseem ceeb rau cov pa roj thiab chav
- Lub computer khiav, qhov taw qhia, PLC, lossis DCS los tso saib thiab ua kom tag nrho ntws
Lub zog muaj zog yog qhov yooj yim ntawm kev siv tshuab, tsis muaj qhov txav mus los, tus nqi qis, ntau qhov ntau thiab tsawg ntawm cov yeeb nkab loj, thiab ntau xyoo ntawm cov ntaub ntawv kev ua tau zoo. Kev lag luam tseem ceeb-offs yog qhov ruaj khov (tsis yog- rov qab tau) siab poob, kev hloov pauv hloov pauv me me, thiab rhiab heev rau kev teeb tsa zoo thiab cov dej tsis zoo.
Yuav Ua Li Cas Orifice Plate Hom Muaj Cai?
Ib qhov chaw tsis meej pem yog kho txhua "hom" raws li tib yam kev xaiv. Hauv kev xyaum, daim phiaj orifice tau piav qhia raws li plaub qhov kev ywj pheej, thiab ib lub phaj tuaj yeem zaum ntawm plaub zaug ib zaug.
| Classification axis | Tej kev xaiv | Qhov nws piav |
|---|---|---|
| Nthuav geometry thiab txoj hauj lwm | Concentric, eccentric, segmental, annular | Qhov twg thiab qhov qhib qhov zoo li cas |
| Inlet ntug / nkag tsim | Ntses (square) ntug, quadrant ntug, conical nkag | Yuav ua li cas cov kua sib cog lus ntawm lub bore, uas tseem ceeb ntawm Reynolds tus lej qis |
| Muaj nuj nqi | Ntsuas orifice, txwv orifice | Seb lub phaj ntsuas ntws los yog tswj cov siab thiab ntws |
| Kev pabcuam thiab cov khoom tsim | Txheem, hnav- tiv thaiv kev tsim kho | Cov khoom siv tswv yim siv kom muaj sia nyob abrasive lossis erosive lub luag haujlwm |
Piv txwv li, ib qho hnav- cov phaj resistant tseem tuaj yeem muaj qhov sib xyaw ua ke thiab cov ntug ntse. "Ntaus-resistant" piav qhia txog cov khoom siv zoo, tsis yog lub cev zoo li. Khaws cov axes sib cais ua rau tag nrho cov txheej txheem xaiv ntau dua.
Hom Lub Npe ntawm Orifice Plate Flow Meters
Concentric (Standard) Orifice Phaj
Ib puag ncig bore nyob rau hauv cov yeeb nkab. Qhov no yog lub neej ntawd rau kev huv, ib zaug - kev pabcuam theem thiab tus qauv tsim ncaj qha los ntawm cov qauv thoob ntiaj teb. Hauv cov kua dej huv, cov lus nug xaiv tiag tiag feem ntau yog qhov sib piv beta thiab qhov yuav tsum tau hloov pauv, tsis yog qhov bore zoo li. Nws qhov tsis muaj zog yog qhov kev pabcuam qias neeg: cov khib nyiab, condensate, lossis cov npuas roj tuaj yeem sau ntawm lub phaj, thiab ntug hnav maj mam hloov cov coefficient, yog li nws yog qhov tsis zoo thawj qhov kev xaiv rau fouling lossis abrasive kua.
Eccentric Orifice Phaj
Ib puag ncig bore offset los ntawm qhov chaw. Qhov qhib yog muab tso rau qis rau cov kua uas nqa cov khib nyiab, yog li cov khoom cheb los ntawm, los yog siab rau cov pa roj thiab vapor kab uas tuaj yeem tso cov condensate, yog li cov kua ntws tawm ntau dua li pooling. Nrog ib tug eccentric phaj orientationyogtus tsim: nruab qhov offset rau ntawm qhov tsis ncaj ncees lawm thiab tus kheej - tso dej los yog tus kheej - qhov kev pab cuam venting yog ploj tag nrho. Flow kev taw qhia thiab bore txoj hauj lwm yuav tsum tau cim kom meej meej nyob rau hauv lub phaj tab.
Segmental Orifice Phaj
Qhov qhib yog zoo li lub voj voog ntu uas zaum qis hauv lub qhov bore, yog li cov sludge thiab cov khib nyiab pov tseg dhau mus yam tsis tsim lub pas dej hauv qab ntawm cov yeeb nkab. Nws yog qhov kev xaiv ib txwm muaj thaum qhov kev tso dej hauv qab yog hom tsis ua haujlwm uas koj tab tom tsim tawm tsam, xws li slurry, dej qias neeg, thiab fibrous lossis sediment - cov kwj deg. Nws txo qhov kev pheej hmoo ntawm kev txuas piv nrog cov phaj concentric tab sis yog daim ntawv thov ntau dua - tshwj xeeb thiab xav tau ceev faj qhov loj me.
Quadrant Ntug Orifice Plate
Ib puag ncig, lub quarter- lub voj voog inlet es tsis txhob ntawm ib tug ntse square ntug. Cov ntawv sib npaug ua kom cov pa tawm coefficient ruaj khov ntawm cov lej Reynolds qis, qhov twg lub phaj ntse ntse -edged ua tsis tau. Nws haum rau cov kua dej huv xws li cov roj hnyav, cov kua txiv hmab txiv ntoo, thiab cov tshuaj viscous, thiab qis - cov kab nrawm. Rau cov viscosity heev uas thawb dhau ntawm lub phaj orifice qhov chaw xis nyob, qhov zoo - txav chawoval iav flowmeterfeem ntau yog qhov haum zoo dua li txhua yam khoom siv DP.
Conical Entrance Orifice Phaj
A 45-degree tapered inlet uas txuas ntxiv kev siv tau mus rau Reynolds cov lej qis dua li ntawm ntug plaub. Qhov no yog ib qho kev xaiv tshwj xeeb rau cov kua dej khov heev lossis cov dej ntws qis heev, qhov twg cov phaj square-edged coefficient tsuas tuaj yeem ntseeg tsis tau. Nws tsis yog cov cuab yeej tsim nyog rau cov dej huv, roj, lossis chav dej, qhov twg cov phaj yooj yim yog pheej yig dua thiab muaj tseeb.
Kev txwv Orifice Plate
Ib qho kev txwv orifice tsis yog ib qho khoom siv ntsuas. Nws txoj hauj lwm yog txo qis los yog lub hau ntws rau kev tiv thaiv twj tso kua mis, kev tswj kev siv hluav taws xob, kev tiv thaiv - kev pabcuam surge, lossis ntau- theem siab tso tawm, tsis yog los tsim cov teeb liab DP calibrated. Qhov kev ceeb toom tseem ceeb yog lub zog tawg: ib qho loj loj - theem siab poob tuaj yeem flash lossis cavitate cov kua, los yog choke roj ntawm sonic tshaj tawm, ua suab nrov, vibration, thiab yaig. High-poob cov kev pabcuam yog li ntawd feem ntau siv ntau- qhov lossis ntau- theem txwv cov phaj tshwj xeeb kom txhua theem qis dua qhov cavitation lossis txhaws qhov pib. Tsis txhob ntsuas qhov kev txwv kev txwv thiab nyeem nws DP raws li ntws tshwj tsis yog nws tau tsim thiab ntsuas qhov ntawd.
Annular (Ntiv nplhaib) Orifice Plate
Flow hla dhau qhov sib txawv ntawm ib ncig ntawm lub hauv paus disc es tsis yog los ntawm lub hauv paus bore. Nws yog ib qho tsis tshua muaj, tsim tshwj xeeb dua qee zaum siv cov khoom khib nyiab lossis tsis yog - qhov zoo tshaj plaws tshaj tawm cov teeb meem rau cov phaj sib xws. Vim tias nws ntog sab nraum cov qauv geometries uas hnyav tshaj plaws, kho nws raws li qhov project- tshwj xeeb, feem ntau cov chaw tsim khoom-calibrated tov es tsis yog ib qho khoom siv ntsuas.
Hnav -Resistant Orifice Plate Designs
Qhov no yog cov ntaub ntawv thiab kev tsim kho lub tswv yim es tsis yog ib qho bore geometry. Hardened alloys, tungsten carbide npoo, los yog thicker erosion - cov phaj resistant yog muab tso rau hauv ib tug concentric, eccentric, los yog segmental phaj kom ciaj sia particle-laden gas, abrasive slurry, los yog plua plav khib nyiab thauj. Nws yuav cov kev pab cuam lub neej thiab coefficient stability nyob rau hauv erosive lub luag hauj lwm ntawm tus nqi pib dua, thiab nws yog tsis tsim nyog rau cov kev pab cuam huv si.
Orifice Plate Hom Sib Piv Table
| Phaj hom | Kev faib tawm thawj zaug | Cov kev pabcuam | Lub zog loj | Kev txwv loj |
|---|---|---|---|---|
| Concentric (tus qauv) | Nthuav geometry, ntse ntug | Ntxuav kua, gases, chav | Yooj yim, raug, tag nrho standardized | Plugs thiab hnav hauv qhov chaw qias neeg lossis abrasive |
| Eccentric | Pog txoj hauj lwm | Cov kua dej qias neeg, roj ntub, condensate - cov kab kab | Cia cov khib nyiab los yog kua nqa hla dhau | Kev taw qhia yog qhov tseem ceeb |
| Segmental | Nthuav geometry | Slurry, sediment, fibrous ntws | Tsis txhob muab tso rau hauv qab thiab ntsaws | Daim ntawv thov -qhov loj me |
| Quadrant ntug | Inlet ntug tsim | Cov kua dej huv huv, qis tshaj tawm | Stable coefficient ntawm tsawg Reynolds tus lej | Tsis yog rau cov khoom loj; Re band yog tshwj xeeb |
| Conical nkag | Inlet ntug tsim | Cov kua nplaum heev lossis tsawg heev Reynolds tus lej | Extends usable low -Re ranges | Tus kws tshaj lij; ceev faj qhov loj me yuav tsum tau |
| Txoj kev txwv | Muaj nuj nqi | Siab tso tawm, ntws limiting | Yooj yim, ruaj siab tswj | Cavitation, flashing, lossis suab nrov ntawm kev poob siab |
| Annular (ntiv nplhaib) | Nthuav geometry | Xaiv qhov nyuaj lossis tsis yog - zoo tagnrho ntws | Tolerates qee qhov khib nyiab thiab tsis zoo profiles | Tsawg tus qauv thiab ntau qhov tshwj xeeb |
| Hnav-resistant | Material design (txhua qhov bore) | Abrasive los yog erosive media | Lub neej ua haujlwm ntev thiab ruaj khov | Tus nqi pib siab dua |
Phau Ntawv Qhia Kev Xaiv Ceev: Hom twg Orifice Phaj haum haum koj cov kua dej?
Raws li qhov pib taw qhia, ib txwm lees paub tawm tsam tag nrho qhov loj me, kev xaiv feem ntau ntws los ntawm cov kua dej rov qab mus rau lub phaj style.
| Dej los yog lub hom phiaj | Pib hom phaj | Vim li cas | Saib xyuas |
|---|---|---|---|
| Ntxuav kua, roj, los yog chav | Concentric, ntse ntug | Standard, zoo ntaub ntawv, muaj tseeb | Ntug hnav thiab tso nyiaj ntau dhau mus ntev |
| Cov kua dej qias neeg nrog lub teeb khib nyiab lossis condensate | Eccentric | Offset bore cia cov khib nyiab los yog kua dhau | Kev taw qhia yuav tsum muaj tseeb |
| Sludge, sludge, fibrous los yog sediment-laden | Segmental | Tsawg qhib kom tsis txhob muaj qhov tso tawm hauv qab | Daim ntawv thov -qhov loj me |
| viscous huv kua (roj, syrup) | Quadrant ntug | Stable coefficient ntawm tsawg Reynolds tus lej | Tsis yog rau cov khoom loj |
| Cov kua nplaum heev lossis tsawg heev Reynolds tus lej | Conical nkag | Ntxiv qhov siv tau qis -Re range | Tus kws tshaj lij, ceev faj qhov loj me |
| Siab tso tawm los yog ntws txwv | Txoj kev txwv | Yooj yim, robust siab poob | Cavitation, flashing, suab nrov ntawm kev poob siab |
| Abrasive los yog erosive media | Hnav- tiv thaiv kev tsim kho (txhua qhov bore) | Survives particle hnav | Tus nqi siab dua |
Lub rooj yog qhov pib, tsis yog lus teb kawg. Rau cov chav huv huv thiab cov pa qhuav qhuav lub phaj concentric yog qhov kev xaiv ib txwm muaj, nrog rau qhov kub thiab txias kom zoo, txawm hais tias ntau cov nroj tsuag sib piv rau ibvortex steam flow meterrau kev sib npaug zog. Rau huab cua thiab txheej txheem roj qhov twg huab hwm coj tseem ceeb, athermal mass flow meteryog qee zaum zoo dua li DP ntaus ntawv.
Yuav Ua Li Cas Xaiv Txoj Cai Orifice Phaj Flow Meter Hom
Phaj style tsuas yog ib feem ntawm qhov kev txiav txim. Cov kab ke hauv qab no ua rau kev xaiv rov ua dua.
Hauv kev xaiv teb thawj lo lus nug tsis tshua muaj lub phaj zoo li. Nws yog seb cov kua dej puas huv si thiab ib zaug -theem, thiab seb koj puas ntsuas dej los yog tswj nws. Tau txais ob lo lus teb ua ntej thiab feem ntau ntawm cov phaj xaiv poob tawm ntawm nws tus kheej.
1. Pib nrog cov kua dej
Yog tias cov kua dej huv, ib zaug -theem, thiab ruaj khov, lub phaj concentric yog lub neej ntawd los ntsuas. Yog tias nws qias neeg, cov khoom khib nyiab-cov kabmob, lossis condensate- tsim, txav mus rau eccentric lossis segmental. Yog tias nws khov, txav mus rau quadrant ntug lossis conical nkag. Yuav luag txhua yam hauv qab dej yog nyob ntawm qhov tau txais thawj kauj ruam zoo.
2. Tus account rau khoom, roj npuas, thiab condensate
Lub teb tsis ua hauj lwm classic yog lub phaj concentric nyob rau hauv ib qho kev pab cuam uas cov khoom sib sau ntawm lub phaj, ua rau plugging, nrov DP, thiab drift. Rau cov kua dej nrog cov khib nyiab, ib qho eccentric bore muab tso rau qis, los yog segmental phaj rau hnyav dua, ua rau txoj kab swept. Rau vapor nrog nqa nqa, tso lub bore thiaj li condensate drains. Nyob rau hauv luv luv, phim lub bore mus rau qhov twg lub pliaj theem xav mus zaum.
3. Xav txog Viscosity thiab Reynolds Number
Nyias-edged daim hlau xav tias turbulent flow. Raws li viscosity nce los yog nrawm ntog thiab Reynolds tus lej poob, kev sib raug zoo ntawm qhov sib txawv siab thiab ntws ua tsis ruaj khov rau ib qho square ntug. Qhov ntawd yog qhov ua rau xav txog quadrant ntug los yog conical nkag daim hlau thiab pin down qhov tseeb kev khiav hauj lwm Reynolds ntau yam. VimCov kua viscosity cuam tshuam rau kev ntsuas ntws, qhov ntom, viscosity, kub, thiab ntws ntau yuav tsum tau muab nkag kom cov pa tawm coefficient tuaj yeem ntsuas ntawm cov xwm txheej tiag tiag es tsis xav.
4. Tshawb xyuas qhov tso cai poob siab
Orifice daim hlau tsim kev poob siab mus tas li, uas yog lawv qhov tsis zoo rau lwm cov thev naus laus zis. Yog tias lub twj tso kua mis lub taub hau pob nyiaj siv, lub zog compressor, lossis lub ntiajteb txawj nqus lossis qis - txoj kab siab tsis tuaj yeem cia qhov poob ntawd, qhov qis dua - cov khoom poob yuav yeej. Txheeb xyuas qhov tso cai tso siab mus tas li ua ntej cog lus rau lub phaj orifice txhua.
5. Paub meej txog kev teeb tsa
Txawm tias lub phaj zoo kawg nkaus nyeem tsis raug yog tias nws raug ntsia tsis zoo. Paub meej tias txausupstream thiab downstream ncaj yeeb nkab khiavrau qhov kev xaiv beta piv thiab qhov ze tshaj plaws fittings, qhov tseeb phaj orientation thiab ntws kev taw qhia, txoj cai tapping hom (flange, ces kaum, los yog D thiab D / 2), zoo gasket alignment kom nws tsis protrude rau hauv lub bore, huv si thiab raug sloped impulse kab nrog condensate pots los yog ntws thiab vent ob txhais ceg rau chav thiab roj, thiab ib tug sib txawv transmitter.
6. Kev ntsuas lossis kev txwv kev ntws?
Txiav txim siab ua haujlwm kom meej. Yog tias koj ntsuas, siv lub ntsuas qhov ntsuas nrog ntsuas DP tag nrho. Yog tias koj tswj xyuas qhov siab lossis ntws, siv qhov kev txwv qhov loj me rau qhov xav tau poob thiab kuaj xyuas cavitation, flashing, thiab txhaws. Tsis txhob plam ob.
Cov ntaub ntawv koj xav tau ua ntej Sizing ib qho Orifice Plate Flow Meter
Txawm li cas los xij, qhov loj me thiab cov khoom lag luam quoting xav tau cov ntaub ntawv sib xws. Kev xa cov ntaub ntawv no mus rau pem hauv ntej kom tsis txhob re-cov lus thiab mis-sizing:
- Hom kua thiab theem (kua, roj, chav, multiphase nyiam)
- Ceev ceev ntawm kev ua haujlwm
- Viscosity ntawm kev khiav hauj lwm kub
- Kev khiav hauj lwm thiab tsim kev kub siab
- Kev khiav hauj lwm thiab tsim qhov kub thiab txias
- Yam tsawg kawg nkaus, ib txwm, thiab siab kawg ntws ntau yam
- Cov khoom siv yeeb nkab, lub sijhawm, thiab sab hauv txoj kab uas hla
- Cov ntsiab lus ntawm cov khoom thiab kwv yees particle loj
- Tso cai poob siab tas mus li
- Yuav tsum tau raug thiab turndown
- Installation orientation thiab muaj ncaj khiav
- Seb lub hom phiaj yog kev ntsuas los yog kev txwv ntws
Nrog rau cov no, tus kws ntsuas ntsuas tuaj yeem kho qhov sib piv beta, bore inch, phaj khoom, tapping hom, thiab transmitter ntau yam, thiab paub meej tias lub phaj orifice yog qhov zoo tshaj plaws thawj cov cuab yeej. Yog tias koj xav tau qhov sib piv dav dua ua ntej ntawd, saib cov lus qhia dav dav rauxaiv ib tug haum flow meter.
Standards thiab Engineering References
Ob tus qauv thoob ntiaj teb thauj tog rau nkoj feem ntau cov phaj phaj tsim thiab siv. Kev hais txog lawv yog txoj hauv kev yooj yim tshaj plaws kom muaj kev xaiv tiv thaiv tsis yog tsuas yog plausible.
- TS EN ISO 5167yog ib qho rau -series series npog cov geometry thiab kev teeb tsa thiab kev ua haujlwm ntawm lub siab- cov khoom siv sib txawv.ISO 5167-2: 2022tshwj xeeb tshaj yog nyob rau hauv lub orifice daim hlau siv nrog flange, ces kaum, los yog D thiab D / 2 tappings rau ib zaug -theem, subsonic, puv - yeeb nkab ntws. Qhov tseem ceeb, nws tsis npog cov kav dej hauv qab 50 mm lossis siab dua 1000 mm sab hauv txoj kab uas hla, lossis Reynolds cov lej qis dua 5000, thiab nws tsis npog vena contracta lossis cov yeeb nkab tappings.
- ASME MFC-3M, Kev ntsuas cov dej ntws hauv cov kav dej siv Orifice, Nozzle, thiab Venturi, muab cov geometry thiab txoj kev siv rau cov thawj pab kiag li lawm nyob rau hauv kaw conduits khiav tag nrho.
Rau kev ntsuas roj ntuj tshwj xeeb, AGA Daim Ntawv Qhia Tsis Muaj . 3 (API 14.3) yog cov kev cai siv. Tus neeg tsim khoom sizing datasheets thiab koj qhov project txheej txheem cov ntaub ntawv ua tiav daim duab. Yog hais tias ib daim ntawv thov ntog sab nraum cov qauv, xws li ib tug me me bore, ib tug tsawg heev Reynolds naj npawb, los yog ib tug kab txawv geometry, kho nws raws li ib tug calibrated tshwj xeeb es tsis yog ib tug standard uncalibrated ntaus ntawv.
Kev txhim kho thiab tu: Cov teeb meem hauv cheeb tsam
Ntev - lub sij hawm cia siab rau feem ntau yog hais txog cov txheej txheem thib ob thiab lub phaj ntug, tsis yog cov duab kos. Cov teeb meem tshwm sim hauv cheeb tsam yog:
- Impulse kab ntsaws thiab kais fouling.Qhov feem ntau ua rau lub siab sib txawv tsis zoo. Khaws tappings meej thiab impulse kab nws tus kheej - tso dej tawm.
- Nthuav- ntug hnav thiab yaig.Ib puag ncig los yog nicked ntug tsa cov paug coefficient thiab kev tsis ncaj ncees rau kev nyeem ntawv, yog li tshawb xyuas ntug hauv cov dej tsis huv lossis qias neeg.
- Condensate tswj ntawm chav.Siv condensate pots thiab kho kais taw qhia kom lub transmitter pom cov kua dej ruaj khov.
- Ob -theem suab nrov.Gas daig nyob rau hauv ib tug kua kab, los yog kua nyob rau hauv ib tug roj kab, unsettles kev nyeem ntawv; tsim nyog qhov cua thiab ntws ob txhais ceg tiv thaiv nws.
- Transmitter drift thiab ntau yam.Periodic xoom checks thiab calibration kom raug nyob rau hauv spec. Kev saib xyuas tib yam siv rauniaj hnub tswj lub siab transmitter.
Teem lub sijhawm tshuaj xyuas los ntawm cov kua dej. Cov phiaj siv hluav taws xob huv huv tuaj yeem ua haujlwm ntev, thaum cov kev pabcuam abrasive lossis fouling xav tau kev saib xyuas zoo dua.
Thaum Orifice Phaj yuav tsis yog qhov kev xaiv zoo tshaj plaws
Lub orifice phaj tsis yog ib txwm yog cov khoom tseem ceeb. Xav txog lwm txoj hauv kev thaum lub siab poob yuav tsum tsawg, cov kua dej yog fouling hnyav los yog abrasive, qhov dej ntau yog qhov dav, qhov xav tau raug siab, cov dej ntws tau zoo heev, lossis kev txhim kho thiab kev saib xyuas tsis zoo. Cov kev xaiv sib txawv thiab qhov twg lawv haum:
- Venturi raj thiab ntws nozzlesmuab qhov kev poob qis qis mus tas li rau cov kab loj thiab lub zog- qhov kev pabcuam rhiab heev, thaum tseem yog DP-raws li thiab them los ntawm tib tsev neeg cov qauv.
- Cov metersmuaj zog rau siab -viscosity, qias neeg, thiab slurry ntws uas rau txim rau ib tug ntse ntug.
- Electromagnetic (magnetic) flowmetermuab ze rau - xoom siab poob thiab ua tau zoo ntawm cov khoom siv hluav taws xob, qias neeg, lossis cov kua dej corrosive, txawm hais tias tsis yog rau cov pa roj lossis tsis yog - cov kua dej conductive.
- Ultrasonic flowmeter, txawm tias clamp- rau lossis hauv kab, ntxiv qhov poob qis thiab ua kom huv si rau cov kua dej qias neeg thiab cov kav dej loj.
- Coriolis huab cua ntws ntsuasxa ncaj qha huab cua ntws ntawm qhov raug siab qhov twg tus nqi raug tsim nyog.
- Vortex meters yog ib qho kev xaiv muaj zog rau chav dej thiab huv si los yog kua nrog kev poob qis; nws pab kom nkag siabYuav ua li cas vortex flowmeter ua haujlwmua ntej muab piv.
Sib piv cov thev naus laus zis rau qhov tseem ceeb txwv, txawm tias qhov kev poob siab, qhov tseeb, fouling, lossis theem, es tsis yog tus cwj pwm.
Feem ntau yuam kev thaum xaiv ib lub phaj Orifice
Ob peb yuam kev account rau feem ntau poob siab orifice installations:
- Kho txhua lub phaj raws li kev hloov pauv tau.Lub phaj txheem uas ua haujlwm hauv kev ua haujlwm huv tuaj yeem ua haujlwm tsis zoo hauv qhov chaw qias neeg, khov, lossis txhuam. Hom phaj yuav tsum ua raws li cov txheej txheem.
- Tsis meej pem qhov kev txwv qhov ncauj nrog lub ntsuas dej ntws.Ib qho kev txwv lub qhov ncauj tswj lub siab los yog ntws; nws tsis yog calibrated ntsuas.
- Tsis quav ntsej kev poob siab mus tas li.Orifice daim hlau yog kev lag luam tab sis tsis qis - poob. Txheeb xyuas qhov poob siab mus tas li thaum qhov loj me.
- Tau bore orientation yuam kev.Rau eccentric thiab segmental daim hlau qhov bore txoj hauj lwm yog ib feem ntawm tus tsim, thiab txhim kho nws tsis raug defeats hom xaiv.
- Tsis nco qab qhov system thib ob.Cov ntug, cov tappings, cov kab impulse, thiab lub transmitter tag nrho tswj kev ntseeg tau, yog li kev saib xyuas tsis tuaj yeem xav txog tom qab.
Cov lus nug nquag
Dab tsi yog hom loj ntawm orifice daim hlau?
Cov hom tseem ceeb yog concentric, eccentric, segmental, quadrant edge, conical nkag, txwv, annular, thiab hnav-cov qauv tsim. Lawv txawv los ntawm bore geometry, inlet ntug tsim, muaj nuj nqi, los yog cov khoom siv tswv yim, uas yog vim li cas lawv tsis yog tag nrho cov tib yam kev xaiv.
Dab tsi yog qhov txawv ntawm eccentric thiab segmental orifice daim hlau?
Lub phaj eccentric muaj ib puag ncig bore offset rau ib sab, feem ntau yog rau cov kua nrog lub teeb khib nyiab los yog rau condensate ntws. Lub phaj segmental muaj ntu - zoo li qhib qhov rooj zaum qis hauv lub bore rau cov khoom hnyav dua thiab slurry. Segmental designs feem ntau zam cov khib nyiab ntau dua li cov eccentric.
Lub orifice phaj twg yog siv rau slurry?
Segmental orifice phaj yog qhov kev xaiv ib txwm rau slurry, vim qhov qis qhib cia cov khib nyiab dhau thiab txo qis hauv qab. Rau hnyav heev los yog abrasive slurry, ib lub ntsuas ntsuas los yog lwm yam thev naus laus zis tuaj yeem txhim khu kev ntseeg ntau dua li cov phaj phaj.
Puas yog ib lub phaj orifice haum rau chav dej?
Yog, orifice daim hlau feem ntau yog siv rau chav. Kev pabcuam chav ua haujlwm yuav tsum tau them nyiaj siab thiab kub zoo, txhim kho kom raug, thiab tuav cov condensate, feem ntau nrog lub lauj kaub condensate thiab txoj cai kais taw qhia.
Dab tsi yog qhov txawv ntawm ib lub phaj orifice thiab ib qho kev txwv orifice?
Ib lub ntsuas qhov ncauj ua rau lub teeb liab sib txawv siv los ntsuas qhov ntws. Ib qho kev txwv qhov ncauj yog tsim los txo qhov siab los yog txwv tsis pub khiav. Lawv tuaj yeem zoo sib xws, tab sis lawv lub hom phiaj tsim thiab qhov loj me txawv.
Qhov twg orifice phaj yog qhov zoo tshaj plaws rau cov kua dej khov?
Quadrant ntug daim hlau haum cov kua dej huv ntawm cov lej Reynolds qis, thiab cov phaj nkag conical txuas ntxiv mus rau qhov ntau dua los yog qis dua - kev pabcuam nrawm. Rau qhov viscosity heev, qhov zoo- cov ntsuas qhov chaw hloov chaw feem ntau ua tau zoo dua ib qho phaj phaj.
Dab tsi yog qhov tsis zoo ntawm orifice phaj flow meter?
Qhov tsis zoo tseem ceeb yog kev ruaj khov, tsis yog - rov qab poob siab. Orifice daim hlau kuj muaj qhov txwv tsis pub dhau thiab muaj kev cuam tshuam rau kev teeb tsa zoo, ntug hnav, thiab dej txias.
Cov yeeb nkab ncaj ntau npaum li cas xav tau lub phaj orifice?
Nws nyob ntawm qhov sib piv beta thiab cov khoom siv ze tshaj plaws xws li khoov, li qub, thiab reducers. ISO 5167 muab qhov ntev ncaj nraim rau txhua rooj plaub, yog li daim duab tseeb yuav tsum yog los ntawm tus qauv thiab koj qhov piping layout es tsis yog ib txoj cai ntawm tus ntiv tes xoo.
Dab tsi cov ntaub ntawv kuv yuav tsum muab rau orifice phaj sizing?
Muab cov kua dej hom thiab theem, ntom, viscosity, kev khiav hauj lwm thiab tsim siab thiab kub, qhov tsawg kawg nkaus, ib txwm, thiab siab tshaj ntws, cov khoom siv yeeb nkab thiab sab hauv txoj kab uas hla, cov ntsiab lus khib nyiab, tso cai poob siab, xav tau qhov tseeb, thiab kev taw qhia kev teeb tsa. Qhov no cia tus neeg muag khoom kho qhov bore, beta piv, cov khoom siv, thiab cov khoom xa tawm.
Kuv yuav xaiv hom phaj orifice li cas?
Pib nrog cov kua dej thiab kev ua haujlwm. Siv lub phaj concentric rau cov kua dej huv, eccentric lossis ntu rau cov khoom qias neeg lossis cov khoom khib nyiab -cov kua dej, quadrant ntug los yog conical nkag rau cov viscous lossis qis Reynolds tus lej kev pabcuam, thiab kev txwv qhov chaw thaum lub hom phiaj yog txo qis lossis ntws txwv tsis yog ntsuas.
Ntsiab Cai
Txoj cai orifice phaj hom ua raws li cov kua dej thiab kev ua haujlwm, tsis yog los ntawm cov yeeb nkab loj ib leeg. Concentric daim hlau tuav cov kua dej huv, gases, thiab chav. Eccentric thiab segmental daim hlau tuav cov kua dej qias neeg, condensate, thiab slurry. Quadrant ntug thiab conical nkag daim hlau tuav viscous thiab qis Reynolds tus lej kev pabcuam. Kev txwv orifices yog nyob rau hauv siab thiab ntws tswj, tsis ntsuas.
Ua ntej cog lus, paub meej tias tus qauv tsim tawm tsam ISO 5167 thiab ASME MFC-3M, tshawb xyuas qhov kev tso cai tsis tu ncua, thiab txheeb xyuas qhov kev teeb tsa thiab tapping. Tom qab ntawd xa tag nrho cov txheej txheem cov ntaub ntawv teev kom lub phaj tuaj yeem ua qhov loj me kom raug. Yog hais tias cov kua dej yog fouling, abrasive, viscous, los yog cov dej ntws yog dav heev, piv cov phaj orifice tiv thaiv qis-tsawg lossis lwm yam thev naus laus zis ua ntej defaulting rau tus qauv pheej yig tshaj plaws.
