Kev teem sijhawm ntawm cov kav dej, feem ntau hu ua "SCH", yog cov txheej txheem siv los txheeb xyuas cov phab ntsa tuab ntawm cov kav dej, ua kom muaj kev sib luag hauv kev tsim khoom, kev xaiv, thiab kev siv thoob plaws hauv kev lag luam. Nws yog ib qho tseem ceeb rau kev txiav txim siab ntawm cov yeeb nkab siab -cov kabmob muaj peev xwm, kav ntev, thiab tsim nyog rau cov haujlwm tshwj xeeb. Ntawm cov yeeb nkab ntau lub sijhawm, SCH 40 thiab SCH 80 yog cov siv dav tshaj plaws hauv kev lag luam, kev lag luam, thiab txawm tias qee qhov kev siv hauv tsev. Phau ntawv qhia no rhuav tshem lawv cov yam ntxwv tseem ceeb, qhov sib txawv, kev qhia tshwj xeeb, thiab kev siv tswv yim los pab koj nkag siab tias yuav xaiv lub sijhawm zoo li cas rau koj cov kev xav tau.
Pipe Scheduling yog dab tsi?
Lub sijhawm ua yeeb yaj kiab yog cov txheej txheem ntsuas ntsuas uas qhia txog phab ntsa tuab ntawm cov kav dej txheeb ze rau lawv qhov loj me (NPS). Qhov tseem ceeb, lubsab nraud txoj kab uas hla (OD)ntawm ib lub yeeb nkab tseem nyob tas li rau tib NPS, tsis hais tus lej teem sijhawm li cas -tsuas yogsab hauv txoj kab uas hla (ID)thiab phab ntsa thickness hloov nrog cov sijhawm sib txawv.Qhov kev tsim qauv no yog tswj hwm los ntawm cov qauv thoob ntiaj teb xws li ASME B36.10 (rau carbon steel kav) thiab ASME B36.19 (rau cov kav hlau stainless), kom ntseeg tau tias muaj kev sib haum xeeb thiab kev sib raug zoo thoob plaws cov tuam txhab sib txawv thiab kev siv.
Lub sij hawm tus naj npawb nws tus kheej yog muab los ntawm kev sib raug zoo ntawm cov yeeb nkab tsim lub siab thiab qhov tso cai rau kev ntxhov siab ntawm cov khoom, scaled los ntawm 1000. Nyob rau hauv cov ntsiab lus yooj yim, cov sij hawm ntau dua sib raug rau cov yeeb nkab phab ntsa tuab, uas txhais tau tias muaj zog ntau dua thiab lub zog ntawm cov qauv.
Cov yam ntxwv tseem ceeb ntawm SCH 40
SCH 40 raug cais raws li qhov nruab nrab - cov kav dej lub sijhawm thiab yog qhov kev xaiv uas siv ntau tshaj plaws hauv cov ntawv thov feem ntau, ua qhov kev xaiv "default" thaum tsis muaj qhov tshwj xeeb siab - qhov yuav tsum tau muaj siab. Nws cov yam ntxwv tseem ceeb yog sib npaug ntawm lub zog, qhov hnyav, thiab tus nqi, ua rau nws muaj ntau yam rau ntau yam xwm txheej.
Core Specifications
- Phab ntsa Thickness: Rau cov pa roj carbon steel kav, lub nominal phab ntsa thickness ntawm SCH 40 yog kwv yees li 1.016 hli (0.040 nti), tab sis qhov no txawv me ntsis nrog ntau qhov sib txawv NPS. Raws li NPS nce, phab ntsa thickness ntawm SCH 40 kuj nce ntxiv kom muaj kev ncaj ncees ntawm cov qauv.
- Siab Muaj Peev Xwm: Qhov siab tshaj plaws ua haujlwm siab ntawm SCH 40 kav yog nyob ntawm cov khoom thiab qhov kub thiab txias, tab sis rau cov pa roj carbon steel ntawm chav tsev kub, nws feem ntau ncav cuag li 48.3 bar (700 psi). Qhov no txaus rau feem ntau qis rau nruab nrab - cov ntawv thov siab.
- Qhov ntev: SCH 40 npog ntau qhov ntau ntawm NPS qhov ntau thiab tsawg, los ntawm 1/8 nti mus rau 30 nti, nrog rau OD ruaj khov rau txhua NPS. Piv txwv li, ib qho NPS 2 (2-nti) SCH 40 yeeb nkab muaj OD ntawm 60.3 hli, nrog tus ID loj dua li SCH 80 yeeb nkab sib txuas (vim nws cov phab ntsa nyias).
- Khoom Compatibility: SCH 40 muaj nyob rau hauv ntau yam ntaub ntawv, xws li carbon steel, stainless hlau (cim raws li SCH 40S), PVC, thiab CPVC, txhua tus haum rau ib puag ncig thiab daim ntawv thov kev xav tau.
Tej kev siv
SCH 40 tau siv dav hauv cov xwm txheej uas qhov kev xav tau siab yog nruab nrab, thiab tus nqi -kev ua tau zoo yog qhov tseem ceeb. Cov ntawv thov uas muaj xws li:
- Cov dej hauv vaj tse thiab kev lag luam thiab cov kav dej
- Tsawg-siab HVAC (cua sov, qhov cua, thiab cua txias) kav
- Tsis yog - corrosive fluid hloov nyob rau hauv lub teeb industrial chaw
- Hluav taws kub sprinkler systems (qhov chaw siab tsis muaj kev txhawj xeeb)
- Cov kav dej hauv cov tsev thiab cov phiaj xwm infrastructure
Cov yam ntxwv tseem ceeb ntawm SCH 80
SCH 80 yog ib qho hnyav-phab ntsa yeeb nkab teem caij, tsim los rau siab -siab, siab- kub, lossis siab- cov ntawv thov kev ntxhov siab qhov kev ua haujlwm ntev thiab kev nyab xeeb yog qhov tseem ceeb. Nws cov phab ntsa tuab muab kev txhim kho lub zog thiab ua haujlwm rau sab hauv siab, cuam tshuam sab nraud, thiab corrosion, ua rau nws tsim nyog rau ntau qhov chaw xav tau.
Core Specifications
- Phab ntsa Thickness: Rau cov pa roj carbon steel kav, lub nominal phab ntsa thickness ntawm SCH 80 yog kwv yees li 2.032 hli (0.080 nti) -ob zaug ntawm SCH 40 nyob rau hauv nws lub hauv paus specification. Raws li NPS nce, qhov sib txawv thickness ntawm SCH 80 thiab SCH 40 widens; Piv txwv li, ib qho NPS 12 SCH 80 yeeb nkab muaj phab ntsa thickness 58% ntau dua li nws cov SCH 40 counterpart.
- Siab Muaj Peev Xwm: SCH 80 cov kav dej muaj qhov ua haujlwm siab dua li SCH 40. Rau cov pa roj carbon steel ntawm chav tsev kub, qhov siab tshaj plaws ua haujlwm siab tuaj yeem ncav cuag 207 bar (3000 psi), ua rau lawv zoo tagnrho rau siab -siab tshuab.
- Qhov ntev: Zoo li SCH 40, SCH 80 qhia tib OD rau tib NPS, kom ntseeg tau tias muaj kev sib raug zoo nrog fittings, flanges, thiab li qub tsim rau qhov loj. Txawm li cas los xij, nws cov phab ntsa tuab ua rau tus ID me dua, uas txo cov peev xwm txaus tab sis ua kom muaj zog ntawm cov qauv.
- Khoom Compatibility: Zoo ib yam li SCH 40, SCH 80 muaj nyob rau hauv carbon steel, stainless hlau (SCH 80S), PVC, CPVC, thiab txawm titanium alloy rau corrosive ib puag ncig (xws li, marine lossis tshuaj ua haujlwm). Nco ntsoov tias PVC SCH 80 yog txwv tsis pub nyob rau hauv compressed cua tshuab vim brittleness thiab kev pheej hmoo ntawm tawg nyob rau hauv siab.
Tej kev siv
SCH 80 yog siv rau hauv cov ntawv thov uas muaj qhov kub siab, qhov kub thiab txias, lossis kev ntxhov siab hauv tshuab. Common siv muaj xws li:
- Siab - cov kua hloov pauv hauv cov roj thiab roj ua cov nroj tsuag
- Cov txheej txheem tshuaj siv tshuaj tua kab mob los yog siab - cov kua dej kub
- Cov kab hluav taws xob muaj zog thiab siab -siab HVAC systems
- Marine thiab offshore piping (resistant rau dej ntsev corrosion)
- Cov kav dej pov tseg hauv hnyav - lub luag haujlwm tsim, qhov kev cuam tshuam tsis zoo yog qhov tseem ceeb
SCH 40 vs SCH 80: Qhov tseem ceeb sib txawv
Thaum SCH 40 thiab SCH 80 qhia tib OD rau tib NPS, lawv qhov sib txawv ntawm phab ntsa tuab, lub peev xwm siab, thiab tus nqi ua rau lawv haum rau cov ntawv sib txawv. Cov lus hauv qab no qhia txog lawv qhov sib txawv tseem ceeb:
|
Yam ntxwv |
SCH 40 |
SCH 80 |
|---|---|---|
|
Phab ntsa Thickness |
Nruab nrab (piv txwv li, 1.016 hli nominal rau carbon steel) |
Hnyav (piv txwv li, 2.032 mm nominal rau carbon steel, ob zaug SCH 40) |
|
Sab hauv Diameter (ID) |
Loj (vim phab ntsa nyias) |
Me me (vim phab ntsa tuab) |
|
Siab Muaj Peev Xwm |
Nruab nrab (txog 48.3 bar rau carbon steel) |
Siab (txog 207 bar rau carbon steel) |
|
Qhov hnyav |
Lub teeb, yooj yim rau kev lis thiab nruab |
Hnyav dua, yuav tsum muaj kev txhim kho zoo dua |
|
Nqi |
Tus nqi ntau dua - siv tau, cov khoom siv qis dua thiab cov nqi teeb tsa |
Tus nqi siab dua, vim yog phab ntsa tuab thiab cov khoom siv ntau dua |
|
Flow Capacity |
Siab dua (ID loj dua tso cai rau cov kua dej ntau dua) |
qis dua (ID me dua txwv tsis pub khiav) |
|
Daim ntawv thov Focus |
Tsawg mus rau nruab nrab siab, dav -lub hom phiaj |
Kev kub siab, kev nyuaj siab, xav tau ib puag ncig |
Yuav xaiv li cas ntawm SCH 40 thiab SCH 80
Kev xaiv cov yeeb nkab raws sijhawm yog nyob ntawm ntau yam tseem ceeb, raws li tau teev tseg hauv qab no. Ua raws li cov kauj ruam no yuav ua kom koj xaiv cov yeeb nkab uas ua tau raws li koj daim ntawv thov kev xav tau thaum ua kom zoo dua tus nqi thiab kev ua haujlwm:
Kauj Ruam 1: Txiav txim siab txog kev ua haujlwm
Ua ntej, txheeb xyuas qhov siab tshaj plaws thiab qhov kub thiab txias ntawm cov yeeb nkab yuav ua rau nws xav siv. Yog tias lub kaw lus ua haujlwm ntawm kev kub siab (ntau tshaj 48.3 bar rau carbon steel) lossis kub siab, SCH 80 yuav yog qhov kev xaiv zoo dua. Rau nruab nrab siab thiab kub, SCH 40 txaus.
Kauj Ruam 2: Txheeb xyuas hom kua dej
Xav txog cov kua uas raug thauj. Corrosive fluids (piv txwv li, tshuaj, dej ntsev) yuav xav tau SCH 80 kav dej ua los ntawm corrosion-cov ntaub ntawv resistant (xws li, stainless hlau, titanium alloy). Tsis yog- cov kua dej corrosive (piv txwv li, dej haus) feem ntau tuaj yeem siv SCH 40 hauv carbon steel lossis PVC.
Kauj Ruam 3: Ntsuas kev teeb tsa thiab tus nqi
SCH 40 yog sib dua thiab yooj yim rau nruab, txo nqi zog. SCH 80 hnyav dua thiab tej zaum yuav xav tau kev txhawb zog ntau dua, nce lub sijhawm thiab tus nqi. Yog tias pob nyiaj siv yog qhov tseem ceeb thiab cov kev xav tau siab yog nruab nrab, SCH 40 yog qhov kev xaiv zoo dua. Rau cov ntawv thov tseem ceeb uas kev nyab xeeb thiab kav ntev tsis yog - sib tham tau, tus nqi siab dua ntawm SCH 80 yog qhov ncaj ncees.
Kauj Ruam 4: Tshawb xyuas Cov Qauv Kev Lag Luam
Ib txwm xa mus rau cov qauv tsim nyog (xws li, ASME B36.10, ASME B36.19) txhawm rau txheeb xyuas qhov ntsuas siab, phab ntsa tuab, thiab cov khoom siv sib raug rau koj cov NPS tshwj xeeb thiab daim ntawv thov. Qhov no ua kom muaj kev ua raws li cov cai hauv kev lag luam thiab cov txheej txheem kev nyab xeeb.
Common Misconceptions
Kev ntseeg yuam kev 1: SCH cov lej sawv cev cov phab ntsa ruaj khov.Qhov tseeb: SCH cov lej txheeb ze rau NPS- phab ntsa thickness nce nrog NPS rau tib lub sijhawm. Piv txwv li, NPS 4 SCH 40 yeeb nkab muaj phab ntsa tuab dua li NPS 1 SCH 40 yeeb nkab.
Kev ntseeg yuam kev 2: SCH 80 yeej ib txwm zoo dua SCH 40.Qhov tseeb: SCH 80 tsuas yog tsim nyog rau siab - siab lossis siab - kev siv kev ntxhov siab. Kev siv SCH 80 nyob rau hauv qis - cov xwm txheej muaj kev ntxhov siab ua rau tsis muaj nyiaj thiab txo cov peev txheej ntws.
Kev ntseeg yuam kev 3: SCH 40 thiab SCH 80 cov kav dej tsis sib xws.Qhov tseeb: Txij li thaum lawv sib koom tib OD rau tib NPS, lawv tuaj yeem siv tib lub fittings, flanges, thiab li qub - hloov pauv yooj yim thiab kev hloov kho.
Xaus
SCH 40 thiab SCH 80 yog cov kav dej siv ntau tshaj plaws, txhua qhov tsim nyog rau kev thov tshwj xeeb. SCH 40 muaj tus nqi- siv tau zoo, muaj ntau yam kev daws teeb meem rau qis rau nruab nrab- cov ntawv siv siab, thaum SCH 80 muab kev txhawb zog thiab siab ua haujlwm rau siab - kev ntxhov siab, ib puag ncig tseem ceeb. Los ntawm kev nkag siab txog lawv cov yam ntxwv tseem ceeb, qhov sib txawv, thiab cov txheej txheem xaiv, koj tuaj yeem xaiv lub sijhawm zoo ntawm cov yeeb nkab kom ntseeg tau tias koj lub kaw lus ua haujlwm zoo, ua tau zoo, thiab tus nqi- zoo.
Nco ntsoov: Qhov kev xaiv ntawm SCH 40 thiab SCH 80 tsis yog qhov tuab xwb - nws yog hais txog kev sib piv cov yeeb nkab lub peev xwm rau qhov xav tau ntawm koj daim ntawv thov, thaum ua raws li cov qauv kev lag luam thiab kev txwv nyiaj txiag.
