Dab Tsi Yog Cov Raj Kub Thiab Hluav Taws Kub?

Cov raj kub thiab hluav taws kub yog cov raj hlau tshwj xeeb uas siv rau hauv cov cuab yeej hloov hluav taws kub xws li shell-and-tube heat exchangers, condensers, evaporators, boilers, thiab lwm yam cuab yeej hloov hluav taws kub. Tsis zoo li cov raj standard uas siv rau kev thauj kua, cov raj kub thiab hluav taws kub yuav tsum ua tau raws li cov kev xav tau nruj heev rau qhov ntsuas qhov loj, qhov zoo ntawm qhov chaw, thiab cov khoom hloov hluav taws kub. Lub phab ntsa ntawm cov raj yuav tsum nyias txaus kom tso cai hloov hluav taws kub zoo ntawm cov kua sab hauv thiab sab nraum, tab sis tseem muaj zog txaus kom tiv taus qhov sib txawv ntawm qhov siab ntawm sab raj thiab sab plhaub. Cov chaw sab hauv thiab sab nraum yuav tsum huv thiab du kom txo qis fouling thiab tswj tau qhov zoo hloov hluav taws kub mus ntev.

Cov raj kub thiab hluav taws kub yog siv rau ntau yam kev lag luam: petrochemical refineries (process heat exchangers, condensers, reboilers), power plants (condenser tubes, feedwater heaters, boiler tubes), HVAC systems (chillers, cooling coils), food processing (pasteurizers, sterilizers), thiab desalination plants (brine heaters, condensers). Kev xaiv cov khoom siv raj, qhov loj, thiab lub phab ntsa thickness yog nyob ntawm qhov kub thiab txias ua haujlwm, qhov siab, qhov ua xeb ntawm cov kua, thiab kev xav tau hloov hluav taws kub ntawm qhov kev siv tshwj xeeb.

ASTM A179 - Seamless Cold-Drawn Heat Exchanger Tube

ASTM A179 npog cov raj hlau low-carbon seamless cold-drawn rau heat exchangers, condensers, thiab lwm yam cuab yeej hloov hluav taws kub. Tus standard npog cov raj uas muaj qhov siab tshaj plaws phab ntsa thickness ntawm 4.2 mm (0.165 inch) thiab qhov tsawg tshaj plaws phab ntsa thickness ntawm 0.5 mm (0.020 inch). Cov tshuaj lom neeg yuav tsum muaj carbon 0.06-0.18%, manganese 0.27-0.63%, thiab residual elements tswj kom qis. Cov carbon tsawg muab kev zoo weldability thiab formability, thaum tus txheej txheem cold-drawn tsim cov dimensional tolerances raug thiab du surface finish uas xav tau rau heat exchanger service.

Tus txheej txheem tsim cold-drawn muab ntau yam zoo rau cov raj kub thiab hluav taws kub. Drawing los ntawm ib lub die ntawm chav tsev kub tsim qhov tseeb dimensional: OD tolerance ntawm ±0.05 mm thiab phab ntsa thickness tolerance ntawm ±5% yog standard. Cov hauj lwm txias kuj txhim kho surface finish, nrog rau cov typical surface roughness Ra ≤ 0.8 μm. Tom qab cold drawing, cov raj yog annealed kom txo qis internal stresses thiab rov qab ductility. Cov raj yuav muab rau hauv cov ntev ncaj (feem ntau 6-12 meters) lossis ua U-bent tubes rau U-tube heat exchanger configurations. Kev siv rau A179 suav nrog shell-and-tube heat exchangers hauv refineries, condensers hauv power plants, oil coolers, thiab intercoolers hauv compressor systems.

ASTM A213 - Alloy & Stainless Steel Heat Exchanger Tube

ASTM A213 npog cov raj hlau seamless ferritic thiab austenitic alloy steel boiler, superheater, thiab heat exchanger tubes. Qhov no yog tus standard dav tshaj plaws rau cov raj kub thiab hluav taws kub kub siab, npog cov grades los ntawm low-alloy T11 (1.25Cr-0.5Mo) mus txog high-alloy T91 (9Cr-1Mo-V) thiab austenitic stainless grades TP304, TP316, TP321, thiab TP347. Tus "T" prefix hauv tus grade designation qhia txog raj daim ntawv (tsis yog "P" rau pipe hauv A335). Rau austenitic stainless steel, cov grades thooj muaj xws li TP304 (kev tiv thaiv xeb dav dav), TP304L (low carbon rau welded applications), TP316 (txhim kho kev tiv thaiv xeb nrog molybdenum), TP316L (low carbon version), TP321 (stabilized nrog titanium rau kev pab kub siab), thiab TP347 (stabilized nrog niobium).

A213 T11, T22, thiab T91 yog ferritic alloy steel tubes siv hauv cov ntawv thov heat exchanger kub siab xws li superheaters, reheaters, thiab feedwater heaters hauv power plants. Cov grades no tuav lawv lub zog ntawm qhov kub siab los ntawm chromium-molybdenum alloy ntsiab lus. T91 yog qhov kev xaiv muaj zog tshaj plaws, muab kwv yees li peb npaug ntawm qhov creep rupture strength ntawm T22 ntawm 600°C, tso cai nyias phab ntsa raj thiab txhim kho kev hloov hluav taws kub. Qhov siab tshaj plaws kev pab kub yog ntawm 593°C (T11, T22) rau 649°C (T91, TP304, TP316). Rau kev nthuav dav alloy steel khoom sib piv, saib peb Alloy Steel Pipe Guide.

ASTM A249 - Welded Stainless Steel Heat Exchanger Tube

ASTM A249 npog cov raj hlau austenitic stainless steel welded rau heat exchangers, condensers, thiab boilers. Cov raj yog tsim los ntawm flat-rolled stainless steel strip lossis plate uas yog tsim ua ib tug raj du thiab welded siv ib tug automatic welding txheej txheem (feem ntau TIG lossis plasma arc welding nrog filler metal ntxiv, lossis high-frequency induction welding). Tom qab welding, cov raj yog cold drawn lossis cold worked kom refine lub weld zone microstructure thiab txhim kho dimensional accuracy, ces solution annealed kom rov qab corrosion resistance thiab mechanical properties.

A249 welded tubes muab ib txoj kev xaiv tus nqi zoo dua li A213 seamless tubes, feem ntau 10-20% qis dua tus nqi rau tib cov khoom siv thiab qhov ntev. Lub welded tube muaj mechanical properties piv rau seamless tom qab ua tau zoo, nrog rau weld joint efficiency factor feem ntau 0.85-0.95 nyob ntawm qhov NDT ua tiav. Tus standard xav tau lub weld seam yuav tsum 100% inspected los ntawm eddy current testing (ECT) lossis hydrostatic testing. A249 yog muaj nyob rau hauv tib austenitic grades li A213 (TP304, TP304L, TP316, TP316L, TP321, TP347) nrog tib cov chemical composition requirements.

Piv Peb Txog Peb Tus Standards

Heat Exchanger Tube Dimensions

Qhov standard OD range rau cov raj kub thiab hluav taws kub yog 6 mm (1/4") txog 50.8 mm (2"), txawm hais tias cov diameters loj dua yog muaj rau cov ntawv thov tshwj xeeb. Wall thickness yog feem ntau qhia los ntawm BWG (Birmingham Wire Gauge) tus lej, qhov twg tus lej BWG siab dua qhia txog phab ntsa nyias dua. Cov loj thooj muaj xws li 10 BWG (3.40 mm), 12 BWG (2.77 mm), 14 BWG (2.11 mm), 16 BWG (1.65 mm), thiab 18 BWG (1.24 mm). Piv txwv, lub raj 3/4" OD x 16 BWG muaj OD ntawm 19.05 mm thiab phab ntsa thickness ntawm 1.65 mm. Qhov ntev yog feem ntau 6 m lossis 12 m rau cov raj ncaj, nrog rau U-bend tubes muaj cov bend radii tshwj xeeb nyob ntawm tus tsim heat exchanger (feem ntau 2-3 npaug ntawm lub raj OD qhov tsawg kawg nkaus bend radius).

Kev Ntsuam Xyuas Heat Exchanger Tube

Kev ntsuam xyuas cov raj kub thiab hluav taws kub suav nrog kev txheeb xyuas qhov ntev (OD, ID, phab ntsa thickness, straightness, thiab ntev), eddy current testing (ECT) rau nrhiav cov defects saum npoo thiab hauv qab, hydrostatic testing raws li tus standard siv tau, thiab mechanical tests suav nrog flaring (txuas lub raj kawg kom txheeb xyuas ductility) thiab flattening (tswv lub raj kom txheeb xyuas weld integrity rau cov raj welded). Surface cleanliness yog txheeb xyuas los ntawm kev saib xyuas qhov muag thiab, rau cov ntawv thov tseem ceeb, los ntawm kev sim oil-and-grease swab.

Phau Ntawv Qhia Kev Xaiv Raj

Kev xaiv cov raj kub thiab hluav taws kub kom raug suav nrog kev ntsuam xyuas qhov kub thiab txias ua haujlwm (qhov kub qis < 200°C siv carbon steel A179; qhov kub nruab nrab 200-500°C siv low-alloy A213 T11/T22; qhov kub siab > 500°C siv stainless steel lossis T91), medium corrosivity (tsis corrosive siv carbon steel; corrosive siv 304/316 stainless; corrosive heev lossis chloride-laden siv 316L lossis duplex), thiab kev xav tau hloov hluav taws kub (phab ntsa nyias dua muab kev hloov hluav taws kub zoo dua tab sis tsawg corrosion allowance). Kev tshuaj xyuas tus nqi lifecycle yuav tsum xav txog tus nqi pib ntawm cov khoom siv ntxiv rau kev cia siab tu, zaus tu, thiab lub sijhawm hloov nyob rau hauv qhov kev pab tshwj xeeb.

Xav Tau Cov Raj Kub Thiab Hluav Taws Kub?

Tiv tauj peb pab neeg engineering rau kev xaiv raj txawj ntse thiab tus nqi sib tw ntawm A179, A213, thiab A249 tubes.

Cov Khoom Siv Qeb

• Stainless Steel Pipe
• Carbon Steel Pipe
• Alloy Steel Pipe
• Galvanized Pipe