Kev faib tawm ntawm Valve Siab Kev Ntsuas hauv Kev Lag Luam Petrochemical
Valve siab ntsuas nyob rau hauv kev lag luam petrochemical feem ntau yog categorized rau hauv peb lub tshuab loj: American Standard (ANSI / ASME Class, los yog "Pound Class"), European Standard / Suav National Standard (PN, los yog "Nominal Pressure"), thiab Japanese Standard (Class K). Ntawm cov no, American Standard yog tus qauv tseem ceeb hauv kev lag luam petrochemical.
I. Kev sib piv ntawm Peb Qhov Kev Ntsuas Siab Loj
Rooj
American Standard (Class)|National/European Standard (PN)|Kwv yees siab (MPa)|Japanese Standard (JIS)|Cov Cai Siv Tau (Petrochemical)
150|NP20|2.0 MPa|10K|Tsis tshua muaj siab: Cov khoom siv roj dav dav, dej, chav dej, thiab cov kav dej cua
300|NP50|5.0 MPa|20K|Tsawg-rau- Nruab Nrab Siab: Hydrotreating, hloov kho, aromatics units, thiab lwm yam.
600|PIB 100|10.0 MPa|40k|Nruab nrab siab: Catalytic cracking, hydrocracking
900|NP150|15.0 MPa|65k|Siab Siab: Siab -siab hydrotreating, ethylene units
1500|NP250|25.0 MPa|110K|Ultra-High Pressure: Ammonia synthesis, urea ntau lawm, sib sib zog nqus- roj hiav txwv extraction
2500|NP420|42.0 MPa|180k|Kev kub siab heev: Tshwj xeeb siab - kub thiab siab - siab
II. Kev piav qhia ntxaws ntawm Core Systems
1. American Standard: ANSI/ASME Chav Kawm (Pound Class)
Cov Qauv: ASME B16.34, B16.5
Yam ntxwv: Siab-Tsuas Kub. Tus lej tus nqi tsis sawv cev rau tus lej ncaj qha; es, nws qhia lub siab tsis kam ntsuas ntawm cov khoom ntawm ib qho kev siv kub.
Chav Kawm 150: Siv ntsuas kub ntawm 260 degree
Chav Kawm 300-2500: Siv ntsuas kub ntawm 454 degree
Feem ntau hauv Petrochemicals: Chav Kawm 150, 300, thiab 600 npog ntau dua 80% ntawm kev ua haujlwm raug cai. 2. Suav National Standard (GB) / European Standard (EN) PN (Nominal Pressure)
Cov Qauv: GB / T 1048, HG / T 20592
Yam ntxwv: Raws li qhov siab tshaj plaws ua haujlwm siab ntawm ** ambient kub (20 degree) **; units yog nyob rau hauv bar (PN16=16 bar=1.6 MPa).
Feem ntau siv hauv petrochemicals: PN16, PN25, PN40, PN63, PN100.
3. Japanese Standard (JIS) - K-Class
Qauv: JIS B2238
Yam ntxwv: Feem ntau yog siv rau kev sib txuam nrog Japanese- cov cuab yeej tsim khoom; 10K ≈ PN20, 20K ≈ PN50.
III. Kev faib tawm thiab xaiv cov kev ntsuas siab hauv kev lag luam Petrochemical
1. Kev faib tawm los ntawm Kev Ua Haujlwm Siab (Petrochemical Industry Convention)
Tsawg Siab
Chav Kawm Tsawg dua lossis sib npaug rau 300 (PN Tsawg dua lossis sib npaug rau 50): Tsawg dua lossis sib npaug rau 5.0 MPa
Daim ntaub ntawv: Atmospheric distillation txhua, tshav kub exchangers, cua txias tshuab, roj roj kab, dej khib nyiab.
Nruab Nrab Siab
Chav Kawm 600–900 (PN 100–150): 6.4–15.0 MPa
Daim ntaub ntawv: Atmospheric thiab nqus distillation, catalytic cracking, hydrorefining, dav compressor qhov hluav taws xob.
Siab Siab
Chav Kawm 1500-2500 (PN Ntau dua lossis sib npaug rau 250): Ntau dua lossis sib npaug rau 25.0 MPa
Daim ntaub ntawv: Hydrocracking, hloov kho, ethylene ntau lawm, synthesis gas, supercritical chav.
2. Kev txiav txim siab xaiv qhov tseem ceeb
Kev kho qhov kub thiab txias: Rau cov chav kawm, nws yog ib qho yuav tsum tau sab laj siab -cov lus ntsuas kub. Raws li qhov kub thiab txias, qhov tso cai ua haujlwm siab txo qis.
Piv txwv li: Carbon steel (WCB) Chav Kawm 300 muaj qhov tso cai siab ntawm 5.0 MPa ntawm qhov kub thiab txias; Txawm li cas los xij, ntawm 425 degree, qhov no poob rau tsuas yog kwv yees li 2.1 MPa.
Cov khoom siv xaiv / sib txuam:
Chav Kawm 150/300: Carbon steel (WCB, LCB), 304 stainless hlau.
Chav kawm 600+: Chrome- molybdenum hlau (WC6, WC9), 316L stainless hlau, duplex stainless hlau. Kev Sib Tw Txwv: Chav Kawm 150 thiab PN16 tsis tuaj yeem ua khub ncaj qha (vim qhov sib txawv ntawm lub ntsej muag sib khi thiab cov qauv ntawm lub qhov taub).
IV. Cov ntsiab lus
Kev xaiv zoo tshaj plaws rau Petrochemical Applications: ANSI Class system (Class 150, 300, thiab 600 yog qhov feem ntau siv).
Feem ntau Siv hauv Cov Haujlwm Hauv Tsev: Lub PN system (PN16, PN25, thiab PN40).
Qhov Tseem Ceeb Distinction: "Class" txhais tau hais tias lub siab- qhov ntsuas kub, qhov "PN" qhia txog lub siab nominal ntawm qhov kub thiab txias; Yog li ntawd, kev xaiv cov khoom siv yuav tsum yog raws li kev ntsuam xyuas dav dav uas siv rau hauv tus account kub, txheej txheem xov xwm, thiab cov khoom siv.
