Yuav Ua Li Cas Xaiv Txoj Cai Hlau Flange rau Siab -Pressure Systems

Taw qhia

Hauv cov txheej txheem sib txawv ntawm cov kav dej hauv kev lag luam, kev ncaj ncees ntawm kev sib koom ua ke feem ntau yog qhov kev txiav txim siab ntawm kev ua haujlwm zoo thiab kev puas tsuaj loj. Txawm hais tias kev thauj cov hydrocarbons tsis hloov pauv thoob plaws teb chaws, tswj kev siab - siab zog hauv lub chaw tsim hluav taws xob, lossis tuav cov tshuaj corrosive hauv cov chaw ua haujlwm, cov khoom siv sib txuas hauv cov tes hauj lwm no ntsib kev ntxhov siab heev. Hauv plawv ntawm cov kev sib tshuam tseem ceeb no yog cov hlau flange. Ua raws li tus qauv choj ntawm cov kav dej, li qub, twj, thiab cov hlab ntsha, lub flange yuav tsum tsis yog tsuas yog muaj kev ntxhov siab sab hauv tab sis kuj tiv thaiv lub sijhawm khoov sab nraud, thermal expansions, thiab ib puag ncig degradation.

Thaum muaj kev cuam tshuam nrog siab -lub zog siab- feem ntau txhais tau tias yog kev ua haujlwm siab dua Chav Kawm 300 lossis cov chaw pib tshwj xeeb uas lub zog tawm sai sai ua rau muaj kev nyab xeeb thiab nyiaj txiag txaus ntshai - cov txheej txheem xaiv hloov pauv los ntawm kev ua haujlwm niaj hnub mus rau kev ua haujlwm zoo. Kev xaiv ib qho tsis tsim nyog steel flange tuaj yeem ua rau cov kab mob me me, kev tawg sai sai, lossis tawg tawg. Txhawm rau tiv thaiv cov neeg ua haujlwm, tiv thaiv cov peev txheej, thiab tswj hwm kev ua raws li ib puag ncig, engineers thiab cov kws tshaj lij kev yuav khoom yuav tsum nkag siab txog qhov sib txawv ntawm qhov kev ntsuas siab, cov khoom siv sciences, geometric designs, thiab cov qauv tsim. Kab lus no xa ib qho hauv - qhov kev tsom xam qhov tob ntawm yuav ua li cas ntsuas thiab xaiv qhov zoo tshaj plaws steel flange rau siab - kev siv siab.

Nkag siab txog Kev Ntsuas Siab thiab Cov Qauv

Cov kauj ruam hauv paus hauv kev xaiv cov flange steel yog ua raws nws cov cuab yeej cuab tam nrog rau kev tsim siab thiab kub ntawm lub cev. Cov kav dej muaj cov kav dej yog tswj hwm los ntawm cov qauv nruj thoob ntiaj teb, feem ntau yog tsim los ntawm American Society of Mechanical Engineers (ASME) thiab American National Standards Institute (ANSI). Rau flanges, cov qauv kev lees paub thoob ntiaj teb feem ntau yog ASME B16.5 (them cov yeeb nkab flanges thiab flanged fittings los ntawm nominal yeeb nkab qhov ntau thiab tsawg NPS 1/2 txog NPS 24) thiab ASME B16.47 (nrog cov kab loj dua los ntawm NPS 26 txog NPS 60).

Nyob rau hauv cov qauv no, steel flanges yog categorized rau hauv cov chav kawm tshwj xeeb siab, feem ntau xws li chav kawm 150 mus txog rau Chav Kawm 2500. Nws yog ib qho kev xav tsis zoo uas cov chav kawm ntawv ntsuas tau ncaj qha rau cov kev ua haujlwm zoo li qub hauv phaus ib square inch (psi). Hauv kev muaj tiag, qhov siab tshaj plaws tso cai ua haujlwm siab (MAWP) ntawm lub flange steel yog qhov hloov pauv hloov tau nruj ua ke nrog kev ua haujlwm kub. Raws li qhov kub ntawm cov txheej txheem dej los yog ambient ib puag ncig nce, lub zog tawm los thiab tensile lub zog ntawm steel degrade. Yog li ntawd, Chav Kawm 900 steel flange ua los ntawm cov hlau tsis muaj zog tuaj yeem tiv taus qhov siab ntawm 2250 psi ntawm qhov kub thiab txias, tab sis nws cov kev txwv kev nyab xeeb yuav poob qis yog tias lub kaw lus ua haujlwm ntawm 800 degrees Fahrenheit.

Cov kws kho tsheb yuav tsum sab laj txog qhov tshwj xeeb siab- cov rooj ntsuas kub tau muab nyob rau hauv ASME B16.5 rau pawg neeg siv khoom siv. Tsis tas li ntawd, nws yog ib qho tseem ceeb kom paub qhov txawv ntawm nominal system siab thiab peak surge pressures. Siab- cov tshuab siab siab feem ntau muaj kev hloov pauv siab vim yog lub valve kaw lossis lub twj tso kua mis pib- tshwm sim hu ua dej rauj. Cov flange uas xaiv steel yuav tsum muaj qhov kev nyab xeeb txaus kom nqus tau cov khoom thauj mus los yam tsis pub dhau nws txoj kev txwv elastic.

Kev xaiv cov khoom siv: Matching Steel Chemistry rau System Demands

Lub flange steel tsuas yog txhim khu kev qha raws li cov metallurgy los ntawm nws yog crafted. Siab - cov ntawv thov kev siab ua rau cov khoom flange ua rau muaj kev ntxhov siab hnyav, kev ntxhov siab ntev, thiab muaj peev xwm ua rau qaug zog. Yog li, cov tshuaj lom neeg muaj pes tsawg leeg thiab cov khoom siv kho tshuab ntawm cov hlau yuav tsum tau ua kom zoo sib xws rau ob qho tib si cov yam ntxwv ntawm cov kua dej sab hauv thiab ib puag ncig sab nraud.

Cov pa roj carbon steel tseem yog cov neeg ua haujlwm siab ntawm - siab muaj cov kav dej, nrog ASTM A105 yog qhov tshwj xeeb tshaj plaws rau forged carbon steel piping Cheebtsam. A105 flanges muab kev ua haujlwm zoo heev, muaj zog weldability, thiab qib siab ntawm cov qauv kev ncaj ncees ntawm tus nqi -tus nqi zoo. Lawv yog qhov tsim nyog rau siab - cov kab hluav taws xob siv hluav taws xob, cov roj thiab roj sib sau ua ke, thiab tsis yog - cov dej xa mus rau qhov twg qhov kub thiab txias nyob hauv thaj tsam nruab nrab, feem ntau los ntawm sub- xoom tej yam kev mob mus txog 800 degrees Fahrenheit. Txawm li cas los xij, rau qhov kub thiab txias los yog cov tshuaj lom neeg muaj zog heev, carbon steel poob luv.

Thaum muaj kev kub siab ua ke nrog qhov kub siab siab -xws li hauv cov kab hluav taws xob superheated lossis refinery cracking units-yuav tsum tau alloy steels. Specifications zoo li ASTM A182 Qib F11 lossis F22 qhia chromium thiab molybdenum rau hauv cov hlau matrix. Chromium txhim kho cov hlau oxidation tsis kam thiab siab - kub lub zog, thaum molybdenum ho txhim kho creep resistance- cov khoom muaj peev xwm los tiv thaiv qeeb, mus tas li deformation nyob rau hauv ntev siab - kev nyuaj siab raug.

Rau ib puag ncig uas muaj tshuaj lom neeg corrosion, pitting, los yog roj qaub (hydrogen sulfide) raug hem kom degrade lub cev, stainless hlau los yog siab alloy flanges yuav tsum tau. ASTM A182 Qib F304L thiab F316L yog tsawg- carbon stainless hlau uas txo qhov kev pheej hmoo ntawm carbide nag lossis daus thaum vuam, khaws cia cov khoom siv tiv thaiv corrosion raws cov cua sov- thaj tsam cuam tshuam. Rau qhov xav tau tshaj plaws siab tshaj - ib puag ncig siab, xws li offshore deepwater extraction lossis aggressive chemical synthesis, Duplex (F51) thiab Super Duplex (F53 / F55) stainless hlau yog ua haujlwm. Cov ntaub ntawv no muaj qhov sib npaug ntawm ob-theem microstructure ntawm austenite thiab ferrite, yielding ob zaug ntawm cov khoom siv zog ntawm cov qauv austenitic stainless hlau nrog rau qhov tshwj xeeb tiv thaiv kev ntxhov siab corrosion thiab hauv zos pitting.

Xaiv qhov tsim nyog Flange Facing thiab Hom

Tshaj li ntawm cov khoom siv chemistry thiab cov chav kawm siab, lub cev geometry ntawm steel flange dictates yuav ua li cas zoo nws faib cov neeg kho tshuab loads thiab tswj cov kua dej - nruj seal nyob rau hauv siab - siab. Kev xaiv muaj ob qho kev txiav txim siab geometrical tseem ceeb: lub cev hom flange thiab tsim ntawm nws lub ntsej muag sealing.

Siab -Pressure Flange Lub Cev Hom

Rau siab -lub tshuab siab, Vuam Neck (WN) flange yog dav suav hais tias yog tus qauv kub. Characterized los ntawm ib tug ntev, tapered hub uas hloov maj mam los ntawm lub flange thickness mus rau cov yeeb nkab phab ntsa thickness, lub vuam caj dab tsim muab cov txheej txheem tseem ceeb. Qhov no tapered hub faib tawm sab nraud dabtsi yog khoov lub sij hawm thiab sab hauv siab stresses smoothly hla kev sib koom tes, txo cov kev ntxhov siab nyob rau hauv lub weld point. Tsis tas li ntawd, lub pob tw-weld kev sib txuas ntawm WN flange thiab cov yeeb nkab tso cai rau kev kuaj xyuas tsis zoo -kev puas tsuaj, ua rau nws muaj kev ntseeg siab rau kev thauj khoom hnyav hnyav lossis siab - kev siv siab.

Hloov pauv, hom xws li Slip-On lossis Socket Weld flanges feem ntau txwv rau cov chav kawm qis lossis cov yeeb nkab me me. Slip-Ntawm flanges tsis muaj cov qauv kev txhim kho ntawm lub hub tapered thiab cia siab rau sab hauv thiab sab nraud fillet welds, uas muaj kev cuam tshuam rau qaug zog nyob rau hauv siab. Qhov muag tsis pom flanges, uas yog cov khoom siv hlau siv los kaw qhov kawg ntawm cov kav dej khiav lossis lub siab lub nkoj, muaj kev ntxhov siab ntau tshaj plaws ntawm lawv cov chaw. Nyob rau hauv siab - ib puag ncig siab, qhov muag tsis pom flanges yuav tsum tau tsim nrog cov tuab tuab heev los tiv thaiv deflection nyob rau hauv tag nrho hydrostatic load.

Flange Facing Options rau Critical Sealing

Cov txheej txheem siv los kaw qhov kev sib txuas yog qhov tseem ceeb sib npaug. Hauv qis-rau- daim ntawv thov siab nruab nrab, Raised Face (RF) flange siv lub semi-hlau lossis compressed fiber ntau gasket feem ntau txaus. Txawm li cas los xij, raws li kev ntxhov siab nce mus rau hauv Chav Kawm 900, 1500, thiab 2500, cov rog sim thawb lub gasket tawm ntawm qhov sib koom ua ke nce exponentially.

Txhawm rau tiv thaiv qhov no, siab - cov tshuab ua haujlwm siab nquag siv lub nplhaib hom Joint (RTJ) ntsib kev teeb tsa. RTJ tsim muaj qhov sib sib zog nqus, ua tiav cov tshuab oval lossis octagonal zawj txiav ncaj qha rau hauv lub ntsej muag ntawm cov hlau flange. Hloov cov roj hmab muag muag, lub nplhaib hlau ua tau zoo- feem ntau yog ua los ntawm cov hlau softer lossis alloy dua li lub flange nws tus kheej- yog muab tso rau hauv qhov zawj. Thaum lub flange bolts yog torqued, lub siab compressive quab yuam plastically deforms lub nplhaib hlau rau hauv qhov zawj, tsim kom muaj cov hlau ruaj khov heev - rau - hlau foob. Qhov kev zoo nkauj ntawm RTJ tsim nyob rau hauv nws tus cwj pwm nyob rau hauv lub siab: raws li lub zog siab nce, lub zog hauv lub cev muaj zog nias lub nplhaib hlau nruj dua rau sab nrauv phab ntsa ntawm qhov zawj, ua rau lub foob nyob rau hauv nws tus kheej- zog thiab tshwj xeeb resistant rau siab - siab blowouts.

Kev tsim cov txheej txheem thiab kev ruaj ntseg zoo

Cov txheej txheem kev ua tau zoo ntawm cov hlau flange nyob rau hauv qhov siab siab yog qhov tseem ceeb khi rau qhov nws tau tsim. Cov qauv kev lag luam nruj me ntsis hais tias flanges rau siab - cov kev pabcuam siab lossis cov kev pabcuam tseem ceeb yuav tsum tau tsim los ntawm cov txheej txheem forging es tsis yog casting lossis txiav los ntawm cov phaj hlau.

Forging suav nrog cua sov steel billet thiab siv cov cuab yeej siv tshuab loj lossis hammers los tswj cov hlau rau hauv nws cov duab kawg. Cov txheej txheem hnyav no hloov cov txheej txheem sab hauv ntawm cov hlau, aligning cov nplej raws cov contours ntawm flange geometry. Qhov no nruam nplej ntws ua rau forged steel flanges ho muaj kev cuam tshuam ntau dua toughness, superior tensile zog, thiab muaj zog tiv taus rau qaug zog thiab tawg piv rau cam khwb cia Cheebtsam, uas yuav harbor internal voids, porosity, los yog inclusions.

Vim tias qhov tshwm sim ntawm flange tsis ua haujlwm nyob rau hauv lub siab - lub zog siab yog qhov hnyav, cov txheej txheem kev lees paub zoo yuav tsum ua nrog cov txheej txheem kev yuav khoom. Cov neeg yuav khoom yuav tsum xav tau cov ntaub ntawv ntxaws ntxaws los ntawm cov chaw tsim khoom, tshwj xeeb yog Mill Test Report (MTR) lossis Material Test Certificate (MTC) ua raws li EN 10204 3.1 lossis 3.2. Cov ntaub ntawv no txheeb xyuas qhov tseeb ntawm cov hlau, txheeb xyuas nws cov tshuaj muaj pes tsawg leeg, lub zog tensile, lub zog tawm los, elongation, thiab hardness qhov tseem ceeb tiv thaiv ASTM lossis ASME specifications.

Tsis tas li ntawd, tsis yog -kev kuaj kev puas tsuaj (NDT) muab ib txheej ntxiv ntawm kev siv tau. Rau siab -siab vuam caj dab flanges, Ultrasonic Testing (UT) los yog Radiographic Testing (RT) yuav tsum tau ua nyob rau hauv raw forging los yog ua tiav weld sib koom ua ke los xyuas kom meej qhov tsis tiav ntawm sab hauv sub- deg defects. Rau cov tshuab ua haujlwm, tshwj xeeb tshaj yog cov kev tiv thaiv nruj uas yuav tsum tau muaj nyob rau hauv RTJ grooves, Liquid Penetrant Testing (PT) lossis Magnetic Particle Testing (MT) yog siv los xyuas kom meej tias tsis muaj cov kab nrib pleb ntawm qhov chaw uas tuaj yeem ua raws li qhov chaw nucleation rau lub siab - vim tsis ua hauj lwm.

Xaus

Xaiv txoj cai steel flange rau lub siab -siab system yog ntau-sib nqus engineering kev sib tw uas yuav tsum tau ua tib zoo saib xyuas kom meej. Ib qho kev khiav hauj lwm ntawm kev kub ntxhov siab tsis muaj chaw rau kev kwv yees lossis kev cuam tshuam. Los ntawm kev ua raws li cov txheej txheem ntawm lub zog dynamic siab- lub hnab ntawv kub nrog cov qauv tsim ASME / ANSI, cov kws ua haujlwm tuaj yeem tsim cov hauv paus kev nyab xeeb rau kev xaiv cov khoom.

Los ntawm cov hauv paus ntsiab lus, xaiv cov khoom siv yuav tsum sib npaug ntawm cov khoom siv dag zog tiv thaiv ib puag ncig thiab tshuaj lom neeg, xaiv cov pa roj carbon steel rau kev siv hluav taws xob, hlau alloy rau thermal kuj, lossis stainless thiab duplex alloys rau corrosive ib puag ncig. Geometrically, opting rau lub zog thauj khoom faib ntawm forged vuam caj dab tsim ua ke nrog lub siab -kev ncaj ncees sealing mechanics ntawm lub nplhaib hom Joint xyuas kom meej tias cov neeg kho tshuab interface tuaj yeem tiv taus ob qho tib si sab hauv thiab sab nraud kev ntxhov siab. Thaum kawg, tswj hwm kev ruaj ntseg zoo los ntawm kev tsim cov txheej txheem forged thiab nruj NDT kev sim tshem tawm qhov sib txawv ntawm cov khoom tsis xws luag.

Thaum kawg, kev nqis peev lub sij hawm thiab kev txawj ntse los xaiv qhov raug steel flange txo qis tag nrho cov nqi ntawm cov tswv cuab los ntawm kev tshem tawm lub sijhawm poob qis, tiv thaiv cov pa phem, thiab ua kom lub sijhawm ntev -, kev nyab xeeb kev ua haujlwm txuas ntxiv ntawm tag nrho cov siab -siab network. Kev koom tes nrog lub koob npe nrov, muaj ntawv pov thawj tag nrho cov tuam txhab uas muab cov ntaub ntawv ua tiav cov ntaub ntawv pov thawj tseem yog qhov kev tiv thaiv zoo tshaj plaws hauv kev coj cov tshuab ua haujlwm siab rau qhov tseeb.