Rau engineers, designers, thiab procurement teams, nkag siab txog qhovsiab ntsuas ntawmASTM A312 TP304 Teem sijhawm 80 kav dejyog qhov tseem ceeb raukev ruaj ntseg system tsim, ua raws li cov qauv, thiab cov ntawv thov kev lag luam. Phau ntawv qhia no muab ib kauj ruam -los ntawm - kauj ruam mus rau xamMaximum tso cai ua hauj lwm siab (MAWP)raws liyeeb nkab qhov ntev, cov khoom siv zog, thiab kev ua haujlwm.
Txheej txheem cej luam ntawm ASTM A312 TP304 SCH 80 Pipes
ASTM A 312 Cov Lus Qhiatxhaisseamless thiab welded stainless hlau kavhaum rau siab -kub thiab corrosive daim ntaub ntawv.
Khoom sivKhoom siv: TP304 Stainless hlau
Cov Txheej Txheem Yeeb Nkab: SCH 80 (phab ntsa tuab kom muaj peev xwm siab dua)
Daim ntawv thov: Kev siv tshuaj, petrochemical, marine systems, fais fab nroj tsuag, thiab kev kho dej
SCH 80 pipes muaj aphab ntsa tuab dua SCH 40, ua kom muaj kev pabcuam siab dua ntawm qhov kub siab.
Basic Formula rau Kev Ntsuas Siab
CovMaximum tso cai ua hauj lwm siab (MAWP)rau ib tug ncaj yeeb nkab nyob rau hauv lub siab sab hauv yuav xam tau siv lubBarlow formula:
P=2 × S × tD − 2 × y × tP=\\frac{2 \\times S \\times t}{D - 2 \\times y \\times t}P=D-2 × y × t2 × S × t
Qhov twg:
| Cim | Lub ntsiab lus |
|---|---|
| P | Sab hauv siab (MPa lossis psi) |
| S | Tso cai kev ntxhov siab ntawm cov khoom (MPa lossis psi) |
| t | Phab ntsa thickness ntawm cov yeeb nkab (mm los yog nti) |
| D | Sab nraud txoj kab uas hla ntawm cov yeeb nkab (mm lossis nti) |
| y | Weld sib koom ua ke (0.85 rau seamless lossis 0.80 rau welded) |
Nco tseg:
RauASTM A312 TP304 seamless kav, y=1 (tsis muaj vuam derating).
Rau cov kav dej welded, siv y=0.85 kom txo qis zog ntawm welds.
Khoom Siv Tau Kev Nyuaj Siab
RauTP304 stainless hlaunyob rau hauv cov kev khiav hauj lwm kub:
| Kub (degree) | Tso cai Stress S (MPa) |
|---|---|
| 20 degree | 138 MPa rau |
| 100 degree | 138 MPa rau |
| 200 degree | 137 MPa ua |
| 300 degree | 136 MPa rau |
| 400 degree | 132 MPa rau |
| 500 degree | 128 MPa |
Tso cai rau qhov kev ntxhov siab yog nyob ntawmASME B31.3 / ASME Boiler thiab Pressure Vessel Code (BPVC).
Piv txwv suav
Muab:
Tube: 2-nti ASTM A312 TP304 SCH 80
Sab nraud txoj kab uas hla D=60.3 mm
Phab ntsa Thickness t=5.54 mm
Khoom siv: TP304 stainless hlau, tso cai rau kev ntxhov siab S=138 MPa
Seamless yeeb nkab, weld factor y=1
Kauj ruam 1: Siv Barlow formula
P=2 × 138 × 5.5460.3−2 × 1 × 5.54P=\\frac{2 \\times 138 \\times 5.54}{60.3 - 2 \\times 1 \\times 5.54}P=60.3-2 × 1 × 5.542 × 138 P MPaP=\\frac{1528.56}{49.22} \\approx 31.0 \\text{MPa}P=49.221528.56≈31.0 MPa
Kev tshwm sim: Qhov siab tshaj plaws ua haujlwm siab ≈31 MPa (≈ 4500 psi)ntawm 20 degree.
Nco tseg: Lub siab txo qis me ntsis ntawm qhov kub siab dua raws li cov khoom tso cai rau kev ntxhov siab.
SCH 80 Pipe Teem caij Phab Ntsa Thickness Reference
| Nominal Pipe Loj (inch) | Sab nraud txoj kab uas hla (mm) | SCH 80 Phab ntsa Thickness (mm) |
|---|---|---|
| 1/2" | 21.3 | 3.91 |
| 3/4" | 26.7 | 4.55 |
| 1" | 33.4 | 5.54 |
| 1 1/4" | 42.2 | 6.02 |
| 1 1/2" | 48.3 | 6.35 |
| 2" | 60.3 | 7.11 |
| 2 1/2" | 73.0 | 7.62 |
| 3" | 88.9 | 8.56 |
| 4" | 114.3 | 9.53 |
| 6" | 168.3 | 11.13 |
Siv daim ntawv qhia no rau kev ntsuas siab rauSCH 80 cev.
Kev txiav txim siab tseem ceeb
Kub Derating: Kev ua haujlwm siab dua kom txo tau kev ntxhov siab. Ib txwm siv qhov kub thiab txias- kho qhov ntsuas kev ntxhov siab.
Welded Yeeb Nkab: Siv covWeld sib koom ua ke (y <1).
Corrosion Allowance: Rau corrosive kua, txo phab ntsa thickness los yog MAWP raws li.
Codes thiab Standards: Xyuas kom ua raws liASME B31.3, ASME B31.1, lossis API 570nyob ntawm daim ntawv thov.
Safety Factor: Siv cov npoo kev nyab xeeb raws li qhov yuav tsum tau ua.
FAQ
1. ASTM A312 TP304 SCH 80 yeeb nkab yog dab tsi?
ASTM A312 TP304 SCH 80yeeb nkab yog stainless hlau yeeb nkab nrog aTeem sijhawm 80 phab ntsa thickness, tsim raukev siv siab duanyob rau hauv corrosive los yog siab -kub ib puag ncig.
2. Qhov txawv ntawm SCH 40 thiab SCH 80 kav dej yog dab tsi?
SCH 80 cov kav dej muajphab ntsa tuab dua SCH 40, ua raumuaj peev xwm siab dua. Qhov nce ntawm phab ntsa thickness txhim khoCov qauv muaj zog thiab kev nyab xeebrau kev siv tshuab.
3. Kev ntsuas siab ntawm SCH 80 TP304 kav dej li cas?
CovMaximum tso cai ua hauj lwm siab (MAWP)yog xam siv covBarlow formula:
P=2 × S × tD − 2 × y × tP=\\frac{2 \\times S \\times t}{D - 2 \\times y \\times t}P=D-2 × y × t2 × S × t
Qhov twgSyog pub kev nyuaj siab,tyog phab ntsa thickness,Dyog sab nraud txoj kab uas hla, thiabyyog qhov weld factor.
4. Dab tsi yog qhov kev cia siab rau TP304 stainless hlau?
Rau TP304 stainless hlau ntawm20 degree, covtso cai stress (S)yog kwv yees138 MPa (20,000 psi). Ntawm qhov kub siab dua, qhov tso cai rau kev ntxhov siab txo qis me ntsis.
5. Puas yog hom vuam cuam tshuam rau qhov ntsuas siab?
Yog lawm.Seamless kavsiv lub weld factory = 1, thaumwelded kavfeem ntau sivy = 0.85txhawm rau txhawm rau txo lub zog ntawm weld seam.
6. Cov kav dej TP304 SCH 80 puas tuaj yeem tswj tau qhov kub thiab txias?
Yog lawm. TP304 stainless hlau tuaj yeem kovnruab nrab kub, thiab SCH 80 phab ntsa tuab tso cai rau lub zog ntxiv ntawm qhov kub siab. Rau qhov kub thiab txias, xyuastso cai rau kev ntxhov siab derating rooj.
7. Cov kev lag luam twg siv TP304 SCH 80 kav?
Common industries muaj xws li:
Kev ua tshuaj lom neeg
Petrochemical nroj tsuag
Kev tsim hluav taws xob
Kev kho dej
Marine thiab offshore structures
8. Koj yuav txiav txim siab li cas phab ntsa thickness rau SCH 80 kav?
Phab ntsa thickness yog txhais los ntawm covcev teemthiabnominal yeeb nkab loj. Piv txwv li, a2-inch SCH 80 tubmuaj phab ntsa thickness ntawm7.11mm 7.
9. Qhov kub thiab txias cuam tshuam li cas rau MAWP?
Raws likub nce, covtso cai kev nyuaj siab ntawm TP304 txo, txo MAWP. Ib txwm sivqhov kub thiab txias- kho qhov kev ntxhov siabthaum xam cov kev ntsuas siab.
10. Cov kav dej SCH 80 puas tuaj yeem siv rau hauv qhov chaw corrosive?
Yog lawm. TP304 stainless hlau muajzoo heev corrosion kuj, haum raume me corrosive tshuaj thiab dej systems. Rau kev txhim kho corrosion (chlorides, acids), xav txogTP316 los yog TP316L.
11. Cov kav dej SCH 80 puas kim dua SCH 40?
Yog lawm. SCH 80 cov kav dej muajkhoom siv ntau duavim cov phab ntsa tuab, uas ncetus nqi thiab qhov hnyavpiv nrog SCH 40 kav.
12. Kuv puas tuaj yeem siv TP304 SCH 80 cov kav dej rau cov kav dej?
Yog, muab covsiab thiab qhov kub thiab txias yog nyob rau hauv kev txwv. Siv MAWP suav nrog kom muaj kev nyab xeeb.
13. Cov yeeb nkab txoj kab uas hla yuav cuam tshuam li cas rau kev ntsuas siab?
Rau qhovtib phab ntsa thickness, a me txoj kab uas hlamuaj ibsiab dua qhov ntsuasvim hais tias kev nyuaj siab yog inversely proportional rau txoj kab uas hla nyob rau hauv lub Barlow formula.
14. Cov kav dej SCH 80 puas xav tau cov khoom siv tshwj xeeb?
Yog lawm. Fittings yuav tsumphim cov yeeb nkab lub sijhawm thiab cov khoom siv qiblos xyuas kom meej lub zog thiab corrosion kuj.
15. Puas muaj kev siv ceev ceev rau TP304 SCH 80 kev ntsuas siab?
Yog lawm. Engineers feem ntau sivua ntej- xam MAWP cov lusrau cov yeeb nkab txheem qhov loj me thiab qhov kub thiab txias, uas yooj yim rau kev tsim thiab kev yuav khoom.
16. SCH 80 cov kav dej puas tuaj yeem welded hauv thaj teb?
Yog lawm. TP304 tuaj yeem ua tauteb welded, tab sis xyuas kom raugqis-cov pa roj carbon lossis stabilized vuam xyaumkom tsis txhob muaj corrosion ntawm qhov sib koom ua ke.
17. Dab tsi yog qhov ceev ntawm TP304 stainless hlau?
Qhov ceev yog kwv yees li8.0 g / cm³, uas yog siv los xamyeeb nkab nyhav ib 'meter'rau shipping thiab kev txhawb nqa.
18. Kuv puas tuaj yeem siv SCH 80 cov kav dej rau siab - tshuaj lom neeg siab?
Yog, muab covsiab tsis tshaj MAWPthiab covchemical yog sib xwsnrog TP304 stainless hlau.
19. Puas yog SCH 80 cov kav dej muaj nyob rau hauv seamless thiab welded hom?
Yog lawm. ASTM A312 TP304 SCH 80 kav yuav ua tauseamless, welded, lossis txias - ua haujlwm welded, nyob ntawm qhov loj me thiab kev tsim khoom.
20. Kuv yuav xaiv li cas ntawm SCH 40 thiab SCH 80 rau ib qhov project?
Xaiv SCH 80 thaum:
Yuav tsum muaj kev ntsuas siab dua
Kev nyab xeeb yam tseem ceeb heev
Lub kaw lus yuav fimkub hloov pauv lossis kev ntxhov siab sab nraud
SCH 40 yog haum raulow-siab lossis nqi-sensitive applications.
