Aluminium Brass C68700 yog dab tsi
C68700 yog txhuas tooj dag, tooj liab-zinc alloy nyob rau hauv uas tswj kev sib ntxiv ntawm txhuas, txhawb los ntawm ib tug me me ntawm arsenic raws li ib tug inhibitor, ua ib lub raj cov ntaub ntawv uas muaj txiaj ntsig zoo ua ke ntawm lub zog, thermal conductivity thiab tsis kam mus rau dej txav. Nws belongs rau tib lub raj seamless tsev neeg raws li admiralty tooj dag thiab tooj liab - qib npib tsib xee, tab sis nws yog xaiv rau ib tug txawv lub luag hauj lwm: C68700 yog cov alloy ntawm kev xaiv qhov twg cov dej txias ntws sai heev los yog nqa ib lub teeb load ntawm suspended solids uas yuav erode ib softer khoom.
Aluminium tooj dag feem ntau tsis meej pem nrog admiralty tooj dag hauv cov lus piav qhia. Ob lub alloys tsis zoo ib yam. Admiralty tooj dag yog C44300, nrog tin thiab arsenic ntxiv, thiab txhuas tooj dag yog C68700, nrog txhuas thiab arsenic. Vim tias tus qauv tsim txwv tsis pub tshaj tawm ntawm cov dej nrawm, ntawm cov ntsiab lus ntawm cov khoom khib nyiab thiab cov kev tiv thaiv corrosion sib txawv ntawm lawv, qhov kev tsim cov hlau alloy ntawm cov duab kos yuav tsum tau kuaj xyuas txhua lub sij hawm tiv thaiv cov ntawv pov thawj ntawm lub raj.
Chemistry thiab Standard Requirements
C68700 seamless raj yog teev nyob rau hauv ASTM B111 thiab nws ASME counterpart ASME SB111, cov specifications uas npog tooj liab thiab tooj liab alloy seamless condenser raj thiab ferrule Tshuag. Cov muaj pes tsawg leeg hauv qab no yog cov siv rau qhov no alloy.
| Element | Qhov siab ntawm C68700 | Muaj nuj nqi |
|---|---|---|
| Tooj | 76.0 - 79.0 % | Base hlau, thermal conductivity |
| Aluminium | 1.8 - 2.5 % | Txhim kho thiab tiv thaiv zaj duab xis nto |
| Arsenic | 0.02 - 0.06 % | Inhibitor tiv thaiv dezincification |
| Coj | 0.07% siab tshaj | Cov khoom seem |
| Hlau | 0.06% siab tshaj | Cov khoom seem |
| Zinc | Tseem tshuav | Cov ntsiab lus tseem ceeb alloying |
Qhov sib ntxiv ntawm txhuas ua rau nyias nyias, nws tus kheej - kho cov yeeb yaj kiab tiv thaiv ntawm qhov chaw ntub dej, thiab cov yeeb yaj kiab ntawd yog vim li cas cov hlau tsis kam tiv taus cov dej nrawm dua li cov tooj dag dawb. Arsenic ua tau zoo ib yam li nws ua nyob rau hauv admiralty tooj dag, suppressing qhov poob ntawm zinc uas yuav txwv tsis pub tawm hauv lub qhov ntxeem tau, tsis muaj zog raj. Cov cuab yeej cuab tam, nrog rau qhov tsawg kawg nkaus tensile lub zog, qhov tsawg kawg nkaus yield zog thiab yam tsawg kawg nkaus elongation, yog teem rau txhua alloy thiab temper nyob rau hauv ASTM B111 thiab ASME SB111, thiab lub raj raug txiav txim rau cov rooj.
Corrosion Performance nyob rau hauv Seawater thiab txheej txheem dej
Sulphide- dej hiav txwv dawb: txhuas tooj dag tiv thaiv kev tawm tsam zoo thiab yog dav siv rau cov chaw nres tsheb fais fab ntawm ntug dej hiav txwv condensers thiab marine cooling systems.
Kev tshaj tawm dej siab: cov khoom siv tiv thaiv aluminium- nplua nuj zaj duab xis ua rau cov hlau tsis muaj zog tiv thaiv kev cuam tshuam thiab yaig, yog li nws haum rau cov kav dej uas cov dej txias tau nqus ntawm qhov nrawm.
Suspended solids: aluminium brass yog siab dua ntawm cov xuab zeb thiab silt tshaj admiralty tooj dag, uas yog vim li cas nws yog nyiam nyob rau hauv estuarine thiab dej txias dej.
Sulphides thiab ammonia: cov no yog cov yeeb ncuab ntawm tag nrho cov tooj liab -zinc alloys. Hydrogen sulphide nyob rau hauv dej qias neeg los yog ammonia nqa nyob rau ntawm lub chav sab tawm tsam lub raj, yog li dej chemistry yuav tsum paub ua ntej lub alloy yog tsau.
Stagnation: deposits thiab sawv dej tuaj yeem tsav pitting thiab nyob rau hauv - tso nyiaj tawm tsam, yog li cov txheej txheem dej ntws tawm thiab ntxuav ua ib feem ntawm kev khiav haujlwm.
Daim ntawv thov
Cov raj hauv C68700 raug pom zoo rau marine thiab av-raws li cov chaw nres tsheb fais fab uas cov dej txias tshaj tawm yog siab, thiab feem ntau yog rau cov dej kub hloov hluav taws xob uas yuav tsum tau siv lub raj tooj liab hlau thiab cov dej kub hnyiab.
Steam deg condensers nyob rau hauv ntug dej hiav txwv thiab dej fais fab chaw nres tsheb thiab hauv cov txheej txheem cov nroj tsuag.
Plhaub-thiab-tube heat exchangers, nrog rau cov roj txias thiab dej txias exchangers hauv roj, roj thiab petrochemical cog.
Desalination thiab dej kho cog cog condensers thiab evaporator bundles.
Marine cav thiab auxiliary heat exchangers, thiab shipboard cooling systems.
Cov tub yees thiab cua- cua txias condensers siv dej ua qhov nruab nrab cua txias.
Kev Xaiv, Fabrication thiab Inspection Guide
Lub raj yog ib txwm muab nkag rau hauv qhov mob annealed kom nws tuaj yeem ua rau cov menyuam nthuav dav rau hauv daim ntawv raj, thiab qhov nthuav dav yuav tsum tau tswj kom txo qis ntawm phab ntsa hauv kev sib koom ua ke nyob rau hauv cov kev txwv uas tau teev tseg los ntawm tus neeg tsim khoom exchanger. Cov raj tau txais kev txhawb nqa los ntawm baffles ntawm qhov sib nrug ntawm qhov tsim tshwj xeeb, vim tias qhov tsis muaj kev txhawb nqa span vibrates hauv kev pabcuam thiab frets los ntawm qhov chaw nws kov lub baffle. Qhov twg lub raj yog khoov rau hauv U, lub vojvoog khoov yuav tsum haum rau lub siab, thiab khoov yuav tsum tau kuaj xyuas qhov ovality. Thaum xa khoom, daim ntawv pov thawj tube yuav tsum tau sib phim rau qhov kev txiav txim rau alloy, temper, qhov ntev thiab cov txiaj ntsig kev xeem, thiab cov pob khoom yuav tsum tau kuaj xyuas kev puas tsuaj ua ntej nws raug teeb tsa, vim tias lub raj dented lossis ovalised yuav tsis yob rau hauv daim ntawv raj kom raug.
Common Pitfalls thiab Inspection Points
Kev lees txais lub raj tau piav qhia xoob li tooj dag yam tsis tau lees paub tias daim ntawv pov thawj nyeem C68700.
Siv cov txhuas tooj dag nyob qhov twg cov dej nqa sulfides, uas tawm tsam tooj liab -zinc alloys tsis hais txog cov ntsiab lus inhibitor.
Xaiv lub siab muaj zog rau U- khoov pob thiab tom qab ntawd pom tias lub raj tsis tuaj yeem tsim lossis nthuav dav yam tsis muaj kev tawg.
Kev tsis saib xyuas qhov nkag nkag -kev tiv thaiv kawg, qhov twg lub dav hlau dej ua ntej ntaus cov ntawv raj thiab impingement yog qhov hnyav tshaj plaws.
Tawm hauv lub pob ntub thiab fouled thaum lub sijhawm kaw, uas tso cai rau cov khoom tso tawm thiab pitting pib ntawm lub raj nto.
FAQ
Q: Puas yog C68700 zoo ib yam li qhuas qhuas tooj dag?
No. C68700 yog txhuas tooj dag, alloyed nrog txhuas thiab arsenic, thaum admiralty tooj dag yog C44300, alloyed nrog tin thiab arsenic. Ob leeg tau teev tseg nyias thiab raug xaiv rau cov dej sib txawv.
Q: Vim li cas C68700 siv rau condensers?
Nws ua ke nrog cov thermal conductivity siab nrog kev tiv thaiv aluminium-nplua nuj nto zaj duab xis, yog li nws zam tau sai - dej txias thiab lub teeb tshem tawm cov khib nyiab thaum hloov hluav taws xob zoo.
Q: Tus qauv twg npog C68700 seamless raj?
ASTM B111 thiab ASME sib npaug ASME SB111 npog tooj liab thiab tooj liab alloy seamless condenser raj thiab ferrule Tshuag, suav nrog C68700.
Q: Dab tsi txwv lub neej ntawm aluminium brass raj?
Dej chemistry thiab kev khiav hauj lwm xyaum txiav txim siab tube lub neej: sulphides, ammonia, deposits, stagnation dej thiab tshaj tshaj tawm yog ib txwm ua rau thaum ntxov tsis ua hauj lwm, tsis yog lub alloy nws tus kheej.
Q: Puas tuaj yeem aluminium tooj dag raj tuaj yeem welded lossis brazed?
Cov hlau tuaj yeem koom nrog cov txheej txheem sib txuas thiab vuam, tab sis nyob rau hauv condensers cov raj feem ntau nthuav dav rau hauv cov ntawv raj, thiab ib qho kev sib koom ua ke yuav tsum tau ntxuav ntawm flux tom qab.
Q: Yuav ua li cas yuav tsum tau txhuas tooj dag raj yuav khaws cia ua ntej installation?
Khaws lub nras kom qhuav thiab hauv qab npog, txhawb nqa nws raws nws qhov ntev, thiab tiv thaiv lub raj kawg; cov ntaub ntub dej, cov khoom sib dhos yog qhov pib ntawm qhov chaw staining thiab nyob rau hauv - deposit corrosion.
