Nyob rau hauv lub ntiaj teb no ntawm hnyav infrastructure, lub zog kis tau tus mob, thiab loj -scale kua dynamics,DN800 (32-nti)steel kav yog cov hlab ntsha ntawm niaj hnub engineering. Muab lawv cov nplai loj heev - tuav siab - ntim ntws thiab qhov tseem ceeb sab hauv siab - txhua qhov tsis ua tiav tuaj yeem ua rau muaj kev puas tsuaj loj. Yog li ntawd, cov txheej txheem tshuaj xyuas rau DN800 cov kav dej yog qhov nruj dua li cov kav dej raws li kev lag luam.
Kev ruaj ntseg zoo rau cov kav dej loj - txoj kab uas hla no ua raws ntau qhov - txoj hauv kev, tsom mus rau kev ncaj ncees ntawm cov khoom siv, qhov tseeb, thiab kev ntseeg tau ntawm cov qauv. Hauv qab no yog cov lus qhia ntxaws ntxaws ntawm cov ntsiab lus tshuaj xyuas tseem ceeb uas yuav tsum tau ua kom ntseeg tau tias DN800 steel kav ua tau raws li cov qauv thoob ntiaj teb xws li API 5L, ASTM A53, lossis EN 10219.
Ua kom koj cov infrastructure kev nyab xeeb.Thov ib daim phiaj tshuaj ntsuam xyuas thiab kuaj tag nrho (ITP)thiab qauv Mill Test Certificate (MTC) rau peb cov kav dej DN800 hnub no.
1. Chemical Composition & Heat Analysis
Lub hauv paus ntawm cov yeeb nkab zoo nyob hauv nws cov metallurgy. Rau cov kav dej DN800, uas feem ntau yog siv nyob rau hauv ntev - cov kav dej nyob deb lossis cov txheej txheem piling, weldability yog qhov tseem ceeb.
Kev Ntsuas Kub:Txhua pawg ntawm cov hlau yuav tsum tau soj ntsuam tag nrho cov tshuaj lom neeg los txheeb xyuas cov pa roj carbon, Manganese, Silicon, Phosphorus, thiab Sulfur qib.
Carbon sib npaug (CE):Rau cov kav dej DN800, cov neeg soj ntsuam xyuas ua tib zoo saib xyuas tus nqi CE. Kev tswj hwm CE ua kom ntseeg tau tias thaum cov yeeb nkab mus txog qhov chaw, nws tuaj yeem welded yam tsis muaj kev pheej hmoo ntawm hydrogen -induced cracking.PMI (Positive Material Identification)feem ntau yog siv rau ntawm -site los xyuas cov ntsiab lus alloying.
2. Kev Ntsuas Cov Khoom Siv Hluav Taws Xob
DN800 kav dej yuav tsum sib npaug siab zog nrog txaus toughness los tuav hauv av txav los yog thermal expansion.
Tensile & Yield Test:Cov qauv raug muab rho tawm (feem ntau los ntawm ob lub yeeb nkab lub cev thiab cov vuam seam rau LSAW / SSAW kav) kom paub meej tias cov khoom ua tau raws li qhov tsawg kawg nkaus yield zog (xws li, 250 MPa rau Qib B lossis siab dua rau X- qib).
Impact Testing:Charpy V-Qhov kev ntsuam xyuas no yog ua los ntsuas cov hlau "toughness"- nws lub peev xwm los tiv thaiv cov pob txha tawg, tshwj xeeb tshaj yog nyob rau hauv txias - kev siv huab cua.
Hardness & Ductility:Flattening thiab flaring xeem kom ntseeg tau tias cov yeeb nkab tuaj yeem tiv taus deformation yam tsis muaj cracking.
3. Dimensional Precision & Tolerance Control
Rau cov kav dej nrog txoj kab uas hla ntawm 812.8mm (DN800), txawm tias qhov sib txawv ntawm 1% tuaj yeem ua rau muaj teeb meem loj heev thaum lub sijhawm teeb tsa.
Ovality (Tawm- ntawm-Roundness):Cov kav dej loj yog nquag "sagging" nyob rau hauv lawv tus kheej qhov hnyav. Kev tshuaj xyuas kom ntseeg tau qhov sib txawv ntawm qhov siab tshaj plaws thiab qhov tsawg kawg nkaus OD ntawm ib qho kev hla -section tseem nyob rau hauv nruj kam rau ua (feem ntau ± 1%).
Phab ntsa Thickness (WT) Kev Tshawb Fawb:Ultrasonic thickness gauges yog siv los xyuas kom meej tias tsis muaj "thin me ntsis" nyob. Cov txheej txheem txheem feem ntau xav tau a+20% / -0%los yog kev zam zoo sib xws, raws li cov phab ntsa tsis zoo yog qhov ua txhaum loj ntawm kev nyab xeeb.
Straightness & Bevel xaus:Qhov ncaj yog ntsuas tshaj qhov ntev (piv txwv li, <0.2% ntawm qhov ntev). Tsis tas li ntawd, lubBevel Lub kaum sab xis(feem ntau yog 30℃lossis 37.5 degree) raug tshuaj xyuas kom ntseeg tau tias cov yeeb nkab yog "weld-npaj."
4. Surface Integrity & Visual Inspection
Qhov no macro-theem check txheeb xyuas qhov chaw-theem discontinuities uas yuav dhau los ua kev ntxhov siab-cov ntsiab lus tseem ceeb.
Defect Detection:Cov kws tshuaj ntsuam xyuas pitting, tawg, slivers, los yog "scabs."
Oxide Scale Tshem Tawm:Rau cov kav dej uas npaj rau txheej txheej (xws li 3LPE lossis Epoxy), qhov saum npoo yuav tsum raug tshuaj xyuas rau cov nplai zeb. Ib qho chaw huv huv yog qhov tseem ceeb rau kev ua kom cov nplaum tiv thaiv -corrosion txheej.
5. Advanced Non-Kev Ntsuam Xyuas Kev Puas Tsuaj (NDT)
NDT yog "siab-tech" lub plawv ntawm cov txheej txheem tshuaj xyuas, tsim los kom pom qhov tsis zoo sab hauv yam tsis muaj kev puas tsuaj rau cov yeeb nkab.
Kev Ntsuas Ultrasonic (UT):Thawj txoj hauv kev rau DN800 kav. Tag nrho -ntev UT scan pom cov laminations sab hauv lossis cov voids hauv cov phaj hlau thiab cov hlua khi.
Radiographic Testing (RT/X-Ray):Feem ntau siv los hla - xyuas cov vuam seams ntawm cov yeeb nkab kawg. Nws muab qhov muag pom "zaj duab xis" ntawm cov qauv vuam sab hauv, kom ntseeg tau tias tsis muaj slag suav nrog lossis roj porosity.
Magnetic Particle Test (MT):Tshwj xeeb yog siv rau ntawm qhov kawg beveled kom pom cov kab nrib pleb me me uas UT yuav nco.
6. Kev Ntsuas Siab Hydrostatic
Qhov kawg thiab qhov teeb meem tseem ceeb tshaj plaws yog qhovHydrostatic Test. Txhua DN800 yeeb nkab yog capped thiab ntim nrog dej ntawm lub siab feem ntau 1.5 npaug ntawm kev tsim ua haujlwm siab (los yog raws li tau teev tseg los ntawm API / ASTM formula).
Lub sij hawm tuav:Lub siab yuav tsum tuav rau lub sijhawm tshwj xeeb (feem ntau 5 mus rau 10 vib nas this).
Kev txheeb xyuas:Cov yeeb nkab raug tshuaj xyuas rau cov dej xau, "hws" lossis deformation mus tas li. Kev ua tiav hydrotest yog qhov kev lees paub qhov kawg uas cov yeeb nkab tuaj yeem tuav nws lub peev xwm ntsuas.
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FAQ
DN 800 yog dab tsi?
DN 800 Nwsyog tus qauv metric siv los piav txog qhov loj ntawm cov yeeb nkab, valve, lossis haum.
DNsawv rauNominal Dia(los ntawm Fabkis lo lus Diamètre Nominal).
800sawv cev rau lub approximate internal txoj kab uas hla nyob rau hauvmillimeter (hli).
DN800 hauv nti yog dab tsi?
Hauv kev lag luam piping,DN 800 Nwsyog tus metric sib npaug ntawm32 ntiv.
Thaum kev hloov pauv lej ncaj qha (800 mm ÷ 25.4) sib npaug kwv yees li 31.5 ntiv tes, tus qauv thoob ntiaj teb rau qhov ntau thiab tsawg siv cov kav dej.NPE 32(Nominal Pipe Size 32) raws li qhov sib tw ncaj qha rau DN 800.
Qhov ntsuas DN ntawm cov yeeb nkab yog dab tsi?
CovKev ntsuas DN(Nominal Diameter) yog ib qho kev faib tawm metric siv los txheeb xyuas qhov loj ntawm cov yeeb nkab, valve, lossis haum.
Lub ntsiab lus:DN sawv cev rau Diamètre Nominal (Fabkis rau Nominal Diameter).
Metric Standard:Nws yog qhov metric sib npaug ntawm North AmericanNPS (Nominal Pipe Size)system, uas siv ntiv tes.
Tus nab npawb:Tus lej tom qab "DN" (piv txwv li, DN 100) sawv cev raukwv yees li ntawm sab hauvhauv millimeters.
Vim li cas nws thiaj siv:Nws ua haujlwm raws li kev siv thoob ntiaj teb kom cov kav dej, flanges, thiab li qub ntawm tib qhov kev ntsuam xyuas DN yuav haum ua ke, tsis hais cov chaw tsim khoom lossis cov khoom tuab.
