Dab Tsi Yog Pipe Schedule? Kev Piav Qhia Txog Kev Faib Phaj Ntawm Phab Ntsa Tuab
Pipe Schedule (SCH) yog tus qauv kev faib tawm ntawm phab ntsa tuab rau cov kav dej hlau, uas tau txhais los ntawm ASME B36.10 rau cov kav dej hlau carbon thiab alloy, thiab ASME B36.19 rau cov kav dej hlau stainless. Lub tshuab schedule tau tsim los muab ib txoj kev ua haujlwm zoo los qhia txog phab ntsa tuab ntawm cov kav dej hauv ntau qhov ntau thiab tsawg, kom ntseeg tau tias yuav hloov tau thiab muaj peev xwm tiv taus lub siab tau zoo. Tus lej schedule siab dua, phab ntsa ntawm lub kav dej yuav tuab dua rau ib qhov nominal txoj kab uas hla.
Lub hauv paus keeb kwm ntawm tus lej schedule hais txog cov qauv mis nyob ze rau ntawm qhov ntsuas lub siab: Sch = 1000 x P/S, qhov twg P yog qhov tso cai rau lub siab sab hauv hauv psi thiab S yog qhov tso cai rau fiber nro hauv psi. Piv txwv li, SCH 40 yog tsim thaum thawj zaug rau 400 psi ua haujlwm siab ntawm qib kev nro ntawm 10,000 psi. Txawm hais tias niaj hnub nim no cov nqi kev nro tau hloov pauv, cov lej schedule tseem yog cov cim qhia txog hom. Kev nkag siab txog qhov kev sib raug zoo no yog qhov tseem ceeb rau cov kws tsim qauv thaum xaiv cov kav dej rau qee yam kev kub thiab kev ntsuas siab tshwj xeeb.
Qhov phab ntsa tuab ncaj qha txiav txim siab rau lub peev xwm tiv taus lub siab ntawm lub kav dej. Phab ntsa tuab dua muab qib siab dua tab sis ntxiv qhov hnyav thiab nqi. Lub tshuab schedule tso cai rau cov kws tsim qauv xaiv qhov zoo tshaj plaws ntawm lub peev xwm siab thiab kev lag luam. Rau cov kev suav ntsuas siab ntxaws, thov saib peb Phau Ntawv Qhia Txog Kev Ntsuas Siab Ntawm Cov Kav Dej.
Daim Ntawv Qhia Txog Pipe Schedule Ua Tiav (SCH 5S - SCH XXS)
Kav Dej Me (1/2" - 4")
| NB (inch) | DN | OD (mm) | SCH 40 WT (mm) | SCH 80 WT (mm) | SCH 160 WT (mm) | XXS WT (mm) |
|---|---|---|---|---|---|---|
| 1/2" | 15 | 21.3 | 2.77 | 3.73 | 4.78 | 7.47 |
| 3/4" | 20 | 26.7 | 2.87 | 3.91 | 5.56 | 7.82 |
| 1" | 25 | 33.4 | 3.38 | 4.55 | 6.35 | 9.09 |
| 1-1/2" | 40 | 48.3 | 3.68 | 5.08 | 7.14 | 10.16 |
| 2" | 50 | 60.3 | 3.91 | 5.54 | 8.74 | 11.07 |
| 3" | 80 | 88.9 | 5.49 | 7.62 | 11.13 | 15.24 |
| 4" | 100 | 114.3 | 6.02 | 8.56 | 13.49 | 17.12 |
Kav Dej Nruab Nrab (6" - 24")
| NB (inch) | DN | OD (mm) | SCH 40 WT (mm) | SCH 80 WT (mm) | SCH 120 WT (mm) |
|---|---|---|---|---|---|
| 6" | 150 | 168.3 | 7.11 | 10.97 | 14.27 |
| 8" | 200 | 219.1 | 8.18 | 12.70 | 15.09 |
| 10" | 250 | 273.1 | 9.27 | 12.70 | 15.09 |
| 12" | 300 | 323.9 | 9.53 | 12.70 | 15.09 |
| 16" | 400 | 406.4 | 9.53 | 12.70 | 16.66 |
| 20" | 500 | 508.0 | 9.53 | 12.70 | 19.05 |
| 24" | 600 | 609.6 | 9.53 | 12.70 | 20.62 |
Kav Dej Loj (26" - 48")
Rau cov kav dej loj dua 24", lub tshuab schedule hloov. Phab ntsa tuab tau qhia raws li SCH 20, SCH 30, SCH 40, SCH 60, SCH 80, thiab SCH 100. Cov ntau thiab tsawg loj dua no feem ntau tsim los ua cov kav dej welded (LSAW lossis SSAW) vim hais tias kev tsim seamless ua tsis tau zoo tshaj 24" OD. Cov nqi phab ntsa tuab rau cov kav dej loj txoj kab uas hla tsis tshua muaj qhov txheej txheem, thiab cov neeg yuav yuav tsum saib cov ntaub ntawv qhia tshwj xeeb ntawm txoj haujlwm. ManufacturerPipe muab cov kav dej loj txog 48" OD nrog phab ntsa tuab ntawm 6.35 mm mus rau 25.4 mm.
SCH 40 piv rau SCH 80 Kev Sib Piv Txog Ntxaws
SCH 40 yog qhov feem ntau tshaj plaws uas tau teev tseg hauv cov kev siv khoom vaj tse. Nws yog sib npaug rau qhov kev qhia qub "Standard" (STD) phab ntsa tuab rau qhov ntau thiab tsawg txog 10", txawm hais tias saum toj 10" STD muaj phab ntsa tuab txawv ntawm SCH 40. SCH 40 muab lub peev xwm tiv taus lub siab txaus rau feem ntau cov kev pabcuam dav dav thiab muab qhov zoo tshaj plaws hauv kev sib piv ntawm lub zog thiab qhov hnyav. Nws yog teev tseg rau cov tshuab dej, huab cua compressed, chav (tsawg mus rau nruab nrab lub siab), thiab cov kev siv qauv dav dav.
SCH 80, keeb kwm hu ua "Extra Strong" (XS) rau cov ntau thiab tsawg me, muab phab ntsa tuab txog li 30-80% tuab dua SCH 40 nyob ntawm qhov ntau thiab tsawg. Qhov phab ntsa tuab ntxiv no txhais ncaj qha mus rau qhov ua haujlwm siab dua. Piv txwv li, 2-inch SCH 80 carbon steel kav dej muaj lub zog ua haujlwm kwv yees li 1.5 npaug ntawm SCH 40. SCH 80 yog xaiv rau cov tshuab hydraulic siab, cov kab chav saum toj 300 psi, cov xwm txheej ua haujlwm hnyav, thiab qhov twg xav tau kev tso dag ntxiv. Qhov hnyav ntxiv yog qhov tseem ceeb: SCH 80 feem ntau raug nqi 40-80% ntau dua SCH 40 rau tib qhov nominal ntau thiab tsawg vim cov khoom siv ntxiv.
| Parameter | SCH 40 | SCH 80 |
|---|---|---|
| Phab Ntsa Tuab (4" NB) | 6.02 mm | 8.56 mm |
| Qhov Hnyav (4" NB) | 16.08 kg/m | 22.32 kg/m |
| Lub Siab Ua Haujlwm (4" A106 Gr.B) | ~15.5 MPa | ~23.0 MPa |
| Kev Siv Thawj Ntsib | Kev siv khoom vaj tse dav dav | Cov tshuab siab siab |
Kev Nrhiav Ceev Rau Cov Schedule Ib Txwm Muaj
SCH 5S / 10S yog cov phab ntsa tuab nyias tshaj plaws, siv feem ntau rau cov kav dej hlau stainless hauv cov kev siv tsis muaj siab thiab kev ua zaub mov. Lub cim "S" qhia tau tias cov schedules no yog tshwj xeeb rau ASME B36.19 stainless steel qauv. SCH 5S yog siv ntau hauv cov kab mis nyuj thiab dej haus uas qhov dej tshav kub yog nruab nrab thiab lub siab qis. SCH 10S muab lub zog me ntsis ntxiv thaum tseem nyias thiab yooj yim rau kev vuam. Cov phab ntsa nyias no feem ntau tsis siv rau cov kav dej carbon steel hauv kev siv siab.
SCH 40 / STD yog qhov qauv kev lag luam phab ntsa tuab rau cov kav dej khoom vaj tse dav dav. Nws sawv cev rau qhov zoo tshaj plaws ntawm lub peev xwm siab, qhov hnyav, thiab nqi rau feem ntau cov kev siv. SCH 40 yog qhov qhia tshwj xeeb rau kev faib dej, cov tshuab cua compressed, chav nruab nrab, thiab cov kev siv qauv. Nws yog qhov feem ntau khaws cia tshaj plaws hauv cov khw muag kav dej thoob ntiaj teb.
SCH 80 / XS muab phab ntsa tuab ntxiv rau cov kev siv siab dua. Nws yog teev tseg thaum qhov kev ua haujlwm siab tshaj qhov SCH 40 muaj peev xwm, qhov twg xav tau kev tso dag ntxiv, lossis qhov twg cov kev xav tau ntawm lub zog txhua yam xav tau phab ntsa tuab dua. XS (Extra Strong) yog qhov kev cai qub uas kwv yees sib npaug rau SCH 80 rau qhov ntau thiab tsawg 8" thiab qis dua, txawm hais tias qhov kev sib raug zoo tiag tiag txawv ntawm qhov ntau thiab tsawg.
SCH 160 / XXS sawv cev rau tej phab ntsa tuab tshaj plaws hauv cov qauv system. XXS (Double Extra Strong) muab qhov phab ntsa tuab siab tshaj plaws uas muaj raws li cov khoom lag luam. Cov schedules no siv rau hauv cov kev siv siab heev, xws li cov tshuab hydraulic, cov kab txhaj tshuaj lom neeg siab, thiab kev pabcuam tseem ceeb uas xav tau qhov chaw nyab xeeb siab tshaj plaws. Qhov hnyav ib 'meter' tuaj yeem ntau dua ob npaug ntawm SCH 40 rau tib qhov nominal ntau thiab tsawg.
Kev Sib Txawv Ntawm Schedule Los Ntawm Cov Khoom Siv
Carbon steel kav dej schedules yog txhais los ntawm ASME B36.10, thaum stainless steel kav dej schedules ua raws li ASME B36.19. Qhov kev sib txawv tseem ceeb yog cov stainless steel schedules uas muaj "S" suffix (SCH 5S, 10S, 40S, 80S) muaj tib lub outside diameters raws li lawv cov carbon steel tab sis tej zaum muaj phab ntsa tuab txawv. Rau SCH 40S thiab SCH 80S, cov phab ntsa tuab yog tib yam li carbon steel SCH 40 thiab SCH 80 rau qhov ntau thiab tsawg 12" thiab qis dua. Txawm li cas los xij, rau SCH 5S thiab SCH 10S, stainless steel phab ntsa tuab yog nyias dua li txhua yam carbon steel schedule, qhia txog qhov kev siv ib txwm muaj ntawm stainless steel hauv cov kev siv lub luag haujlwm sib zog qis dua.
Lub cim "S" meej meem qhia tias lub schedule yog los ntawm ASME B36.19 qauv. Thaum xaj cov kav dej stainless steel, nws yog ib qho tseem ceeb kom teev "S" schedule kom ntseeg tau tias phab ntsa tuab raug muab xa tuaj. Piv txwv li, xaj "4-inch SCH 10S 304L stainless steel kav dej" ntseeg tau tias lub kav dej ua raws li phab ntsa nyias ntawm stainless steel qauv tsis yog qhov hnyav dua ntawm carbon steel qauv.
Yuav Xaiv Pipe Schedule Li Cas Raws Li Lub Siab
Kev xaiv ntawm pipe schedule raws li lub siab ua raws li qhov kev sib raug zoo tseem ceeb ntawm Barlow tus qauv mis: t = (P x D) / (2S), qhov twg t yog qhov tsawg kawg nkaus phab ntsa tuab, P yog tus qauv siab, D yog kab sab nraud, thiab S yog qhov tso cai nro ntawm qhov kub thiab txias tsim. Tom qab suav qhov tsawg kawg nkaus phab ntsa tuab, tus kws tsim qauv ntxiv corrosion allowance (feem ntau 1.5-3.0 mm rau carbon steel) thiab xaiv qhov siab dua ntxiv schedule uas muab tsawg kawg tag nrho qhov tuab uas xav tau.
Temperature derating cuam tshuam loj heev rau cov nqi kev nro tso cai. ASME Section II Part D muab cov ntxhuav ntawm kev nro tso cai rau txhua yam khoom siv kav dej ntawm ntau qhov kub. Piv txwv li, A106 Gr.B muaj qhov tso cai nro ntawm 137.9 MPa ntawm 38°C tab sis tsuas yog 68.9 MPa ntawm 450°C. Qhov txo 50% no txhais tau tias lub kav dej uas txaus ntawm qhov kub ib puag ncig tej zaum yuav xav tau ib lub sijhawm tuab ntawm qhov kub siab. Nco ntsoov xyuas qhov tso cai nro ntawm qhov kub siab tshaj plaws ua haujlwm ua ntej ua tiav kev xaiv schedule.
Cov yam ntxwv kev nyab xeeb tau tsim rau hauv cov nqi kev nro tso cai. ASME B31.3 siv qhov kev nyab xeeb ntawm kwv yees li 3.5 ntawm qhov kawg tensile lub zog los txiav txim qhov kev nro tso cai. Cov yam ntxwv ntxiv suav nrog cov yam ntxwv zoo rau cov kav dej welded (feem ntau 0.85-1.0 nyob ntawm hom vuam thiab qib kev tshuaj xyuas) thiab casting quality factors rau cast fittings. Cov yam ntxwv no ntseeg tau tias tus kav dej selected muab qhov chaw nyab xeeb txaus tiv thaiv kev ua tsis tiav nyob rau hauv txhua qhov xwm txheej ua haujlwm uas tau cia siab.
Daim Ntawv Xyuas Kev Xaiv Pipe Schedule
Kauj Ruam 1: Txiav txim lub siab tsim thiab kub ntawm lub tshuab. Cov no feem ntau teev nyob rau hauv piping thiab instrumentation daim duab (P&ID) lossis cov ntaub ntawv txheej txheem. Kauj Ruam 2: Txheeb xyuas cov khoom siv kav dej raws li kev sib haum xeeb nrog cov kua, kev txwv kub, thiab kev xav tau ntawm lub zog. Kauj Ruam 3: Saib qhov tso cai nro rau cov khoom siv xaiv ntawm qhov kub tsim los ntawm ASME Section II Part D. Kauj Ruam 4: Xam qhov tsawg kawg nkaus phab ntsa tuab uas xav tau siv Barlow tus qauv mis, ntxiv corrosion allowance, thiab xaiv lub schedule uas nws qhov tsawg kawg nkaus phab ntsa tuab (xam rau manufacturing tolerance) sib npaug lossis tshaj tus nqi suav.
Peb Lub Peev Xwm Muab Khoom
ManufacturerPipe muab tag nrho cov pipe schedules ntawm SCH 5S mus txog XXS. Peb lub peev xwm seamless kav dej nthuav tawm SCH 40 txog SCH 160 hauv qhov ntau thiab tsawg ntawm 1/2" mus rau 36". Peb cov kav dej welded tsim tau SCH 5 txog SCH 80 hauv qhov ntau thiab tsawg ntawm 1/2" mus rau 48". Peb kuj muab kev tsim phab ntsa tuab tsis yog qauv rau cov haujlwm tshwj xeeb uas xav tau qhov nruab nrab phab ntsa qhov ntev. Tag nrho cov kav dej muab nrog Mill Test Certificates tag nrho thiab tuaj yeem kuaj xyuas los ntawm tus neeg thib peb.
Xav Tau Kev Pab Txog Pipe Schedule?
Tiv tauj peb pab pawg tsim qauv rau kev taw qhia kws tshaj lij thiab tus nqi sib tw ntawm txhua qhov pipe schedules los ntawm SCH 5S mus rau XXS.
