Momwe Mungasankhire Zopangira Mapaipi Opangidwa ndi Ulusi pa Ntchito Zamakampani

Chiyambi

Mu makina opangira mapaipi a mafakitale, kusankha pang'ono kolumikizira kumatha kukhudza kupewa kutuluka kwa madzi, kupeza malo osungira, kutsatira chitetezo, komanso kugwira ntchito kwa nthawi yayitali. Ma fitting a mapaipi okhala ndi ulusi amagwiritsidwa ntchito kwambiri chifukwa amapanga maulumikizidwe amphamvu amakina popanda kuwotcherera, zomwe zimapangitsa kuti zikhale zothandiza pakukonza, madera oopsa, ndi machitidwe omwe angafunike kuchotsedwa. Komabe, kusankha koyenera kumadalira zambiri kuposa kukula kwa mapaipi ofanana. Mainjiniya ndi ogula ayenera kuganizira za kuthamanga kwa madzi, kuyanjana kwa zinthu, muyezo wa ulusi, njira yotsekera, kugwedezeka, kutentha, ndi madzi kapena mpweya womwe ukuperekedwa. Nkhaniyi ikufotokoza zinthu zofunika kwambiri zomwe zimatsimikiza magwiridwe antchito a fitting kuti mutha kusankha maulumikizidwe a ulusi omwe akugwirizana ndi momwe zinthu zilili komanso kuchepetsa kulephera komwe kungapeweke.

Chifukwa chiyani zida zolumikizira mapaipi okhala ndi ulusi ndizofunikira pa kudalirika kwa mafakitale

Zipangizo zolumikizira mapaipi okhala ndi ulusi zimagwiritsidwa ntchito ngati zinthu zofunika kwambiri m'mafakitale oyendera madzi ndi gasi, zomwe zimapereka njira yodalirika komanso yopanda kupotoza polumikiza zigawo za mapaipi. Ubwino wawo waukulu uli mu ulusi wamakina, womwe umachotsa kufunikira kwa zilolezo zogwirira ntchito yotentha komanso ntchito zapadera zowotcherera. Khalidweli limawapangitsa kukhala ofunika kwambiri mumalo oopsa, monga mafakitale opangira mankhwala ndi malo oyeretsera mafuta, komwe mlengalenga wophulika umaletsa mwamphamvu moto wotseguka.

Zotsatira pa nthawi yogwira ntchito komanso kukonza

Kukhazikika kwa kapangidwe ka netiweki ya mapaipi kumadalira kwambiri nthawi yonse yogwirira ntchito. Mukapangidwa bwino, kulumikizana kwa ulusi kumapereka chisindikizo cholimba chomwe chimachepetsa njira zotayikira madzi ndikupirira kupsinjika pang'ono kwa makina. Komabe, kusankha kosayenera kapena kusagwira bwino kwa ulusi kungayambitse zofooka, makamaka m'makina omwe amayendetsedwa ndi katundu wolemera kapena nyundo yamadzi. Deta yamakampani ikuwonetsa kuti m'makina amadzimadzi ogwedezeka kwambiri, kulumikizana kwa ulusi wosakwanira kumatha kuwonjezera nthawi yogwira ntchito yokhudzana ndi kukonza ndi 15 mpaka 20 peresenti. Kuti achepetse zoopsazi, mainjiniya a mafakitale ayenera kuwunika mosamala zofunikira za torque inayake ndi kuyanjana kwa ulusi kuti atsimikizire kukhazikika kwa ntchito kwa nthawi yayitali.

Mikhalidwe yogwirira ntchito yoyenera kwambiri

Maulalo okhala ndi ulusi sagwiritsidwa ntchito konsekonse ndipo amagwira ntchito bwino kwambiri m'ma envelopu enaake ogwirira ntchito. Amagwiritsidwa ntchito kwambiri pa mapaipi ang'onoang'ono, omwe nthawi zambiri amatanthauzidwa ngati kukula kwa mapaipi (NPS) a mainchesi awiri kapena kuchepera. Mu miyeso iyi, amagwira bwino ntchito zowunikira kuthamanga kwa mpweya, nthawi zambiri amakhala ndi kupanikizika kwamkati mpaka 4,000 PSI kutengera mtundu wa zinthu ndi kalasi ya kupanikizika. Pamagwiritsidwe opitilira muyeso wa kupanikizika uku, kapena omwe ali ndi zinthu zowononga kwambiri kapena zapoizoni, mainjiniya nthawi zambiri amasinthira ku ma socket weld kapena ma flange. Kumvetsetsa malire awa a geometric ndi kupsinjika ndikofunikira kwambiri pakuyika zolumikizira za ulusi komwe zimapereka kudalirika kwakukulu popanda kuwononga malire achitetezo.

Mafotokozedwe a kiyi yolumikizira chitoliro kuti muwunikire

Kusankha zolumikizira mapaipi okhala ndi ulusi kumafuna kusanthula kwamitundu yambiri kwa malo ogwirira ntchito ndi malo olumikizirana madzi. Kusankha kosagwirizana kungayambitse dzimbiri mwachangu, kuphulika kwa mphamvu, kapena kuipitsidwa kwa dongosolo lonse. Mainjiniya ayenera kuwunika zipangizo, mawonekedwe a ulusi, ndi kupanikizika mogwirizana kuti atsimikizire kuti dongosololi ndi lolondola.

Kugwirizana kwa zinthu, kuthamanga, kutentha, ndi zofalitsa

Kusankha zinthu kumatengera kapangidwe ka mankhwala a zinthu zolumikizirana ndi kutentha komwe zimagwiritsa ntchito. Zitsulo zosapanga dzimbiri za Austenitic, makamaka 304 ndi 316 grades, ndi miyezo yamakampani yolimbana ndi dzimbiri komanso kupirira kutentha kwakukulu, ndi 316 steel yosapanga dzimbiri yomwe imatha kugwira ntchito modalirika kutentha mpaka 1,000°F (537°C). Mosiyana ndi zimenezi, zolumikizira zitsulo za kaboni (monga ASTM A105) ndizotsika mtengo kwambiri pa ntchito zosawononga mafakitale monga nthunzi ndi mpweya wopanikizika koma zimafuna zokutira zoteteza kuti zisawonongeke. Zolumikizira zamkuwa ndizofala m'madzi oyenda pansi pa mpweya komanso omwe ali ndi poizoni wochepa koma zimakhala ndi zoletsa kutentha kwambiri, zomwe nthawi zambiri zimawonongeka kuposa 400°F (204°C). Zofunikira pa kuthamanga kwa mpweya ziyenera kugwirizana ndi zinthuzi kudzera m'magulu okhazikika, makamaka Class 2000, 3000, ndi 6000, zomwe zimalamulira makulidwe a khoma ndi kuthamanga kwamphamvu kwa cholumikiziracho.

Miyezo ya ulusi, mitundu yolumikizirana, ndi kulekerera

Mawonekedwe a makina a cholumikiziracho amadalira kwathunthu muyezo wa ulusi womwe umagwiritsidwa ntchito. National Pipe Thread Taper (NPT) ndiye muyezo waukulu ku North America, wolamulidwa ndi ASME B1.20.1. Ulusi wa NPT uli ndi ngodya yocheperako ya 1° 47′ (1.7899°), yomwe imalola ulusi wamwamuna ndi wamkazi kulumikiza pamodzi, ndikupanga chisindikizo chamakina chomwe pambuyo pake chimapangidwa kukhala cholimba ndi tepi ya PTFE kapena zotsekera zamadzimadzi. Mosiyana ndi zimenezi, ulusi wa British Standard Pipe (BSP) umapezeka ku Europe ndi Asia, womwe umapezeka mu geometries zocheperako (BSPT) ndi zofanana (BSPP). Ndikofunikira kwambiri kuti ulusi wa NPT ndi BSP usasakanizidwe mkati mwa dongosolo, chifukwa ma angles awo osiyana a pitch ndi flank amabweretsa galling, ulusi wodulidwa, ndi njira zotsimikizika zotulutsira madzi. Kuphatikiza apo, kulekerera kolondola kopangira ndikofunikira kuti zitsimikizire kuti mtunda wa pitch ndi crests za ulusi zikugwirizana bwino, kupewa kutuluka kwa spiral pansi pa kuthamanga kwambiri.

Kugwiritsa ntchito matebulo oyerekeza poyesa

Kuphatikiza zinthuzi kukhala ma matrices ofanana kumathandiza magulu ogula ndi opanga mainjiniya kupanga zisankho mwachangu komanso molondola. Poganizira magulu opanikizika motsutsana ndi nthawi ya mapaipi, mainjiniya amatha kuwonetsetsa kuti kuyika sikofoka kwambiri mu dongosolo la mapaipi.

Kugwiritsa ntchito matebulo otere kumaonetsetsa kuti cholumikizira cha Class 3000 chikugwirizana bwino ndi chitoliro cha Schedule 160, kusunga makulidwe ofanana a khoma ndi kutsekeka kwa mphamvu mkati mwa cholumikiziracho.

Momwe mungayesere khalidwe, kutsatira malamulo, ndi ogulitsa

Kutsimikizira kukhazikika kwa kapangidwe kake ndi zitsulo za zida zolumikizira mapaipi ndi gawo losakambirana la nthawi yogula. Ogula mafakitale ayenera kukhazikitsa malamulo okhwima.ndondomeko zotsimikizira khalidwekusefa zinthu zosafunikira zomwe zingasokoneze chitetezo cha malo ndi kutsatira malamulo.

Makhodi, ziphaso, mayeso, ndi kutsata

Kutsatira malamulo apadziko lonse lapansi okhudza zitsulo ndi miyeso yake ndiye maziko a kuwunika kwa ogulitsa. Zolumikizira ziyenera kutsatira miyezo yokhwima monga ASME B16.11 ya zolumikizira zopangidwa ndi chitsulo ndi zofunikira za ASTM (monga ASTM A105 yachitsulo cha kaboni, ASTM A182 yachitsulo chosapanga dzimbiri). Ogulitsa apamwamba amapereka Malipoti Oyesera Zinthu a EN 10204 Type 3.1 Material Test Reports (MTRs), kuonetsetsa kuti 100% ikutsatira kuchokera pamalo otentha osaphika kupita ku chinthu chomalizidwa. Pa ntchito zofunika kwambiri, ogula ayenera kulamula mayeso a Positive Material Identification (PMI) kuti atsimikizire zopangidwa ndi alloy asanatumizidwe. Ogulitsa mafakitale otsogola amasunga njira zowongolera zabwino zomwe cholinga chake ndi kusunga kuchuluka kwa zolakwika pansi pa 0.1% (zigawo 1,000 pa miliyoni), kuonetsetsa kuti zida zosalolera sizifika pamalo oyika.

Ubwino wopanga ndi njira zowunikira

Ubwino wopanga wa cholumikizira cha ulusi umakhudza mwachindunji kuthekera kwake kotseka komanso moyo wake wautali. Njira zapamwamba zowunikira zimayang'ana kwambiri pakuyesa ulusi, pogwiritsa ntchito mphete za L1 ndi L2 ndi ma plug gauges kuti zitsimikizire kuti kukula kwa pitch, kuya kwa ulusi, ndi ngodya yopapatiza zikugwirizana ndendende ndi miyezo ya ASME B1.20.1. Kupitilira kulondola kwa mawonekedwe, kutsiriza kwa pamwamba ndi gawo lofunikira kwambiri lowunikira. Ulusi uyenera kuwonetsa malo osalala, opanda burr kuti apewe kuphulika panthawi yomanga. Njira zabwino kwambiri zamakampani zimayang'ana kumapeto kwa pamwamba (Ra) pakati pa mainchesi 63 ndi 125; mtundu uwu wa kapangidwe ndi wabwino kwambiri posunga zomatira za ulusi kapena tepi ya PTFE, kuonetsetsa kuti chisindikizo chodalirika komanso chokhalitsa popanda kuwononga ntchito yolumikizira zitsulo ndi zitsulo yomwe imafunika kuti pakhale kupanikizika kwakukulu.

Zinthu zogulira zamalonda ndi ntchito

Kupatula pa zofunikira zaukadaulo, kugula zida zolumikizira mapaipi olumikizidwa kumakhudzidwa kwambiri ndi kayendetsedwe ka zinthu ndi ndalama zomwe zimagwiritsidwa ntchito nthawi zonse. Njira yopezera zinthu yabwino imagwirizanitsa ndalama zoyambira zomwe zimagwiritsidwa ntchito ndi kupezeka kwa zinthu zomwe zili m'sitolo komanso zofunikira pakukonza kwa nthawi yayitali.

Nthawi yotsogolera, MOQ, ndi kukonzekera zinthu

Kuyang'anira unyolo woperekera zinthuzolumikizira zamafakitalekumafuna kulosera molondola nthawi yotsogolera ndi Kuchuluka Kwang'ono kwa Oda (MOQs). Zigawo zokhazikika, monga zolumikizira 316 zachitsulo chosapanga dzimbiri cha NPT mu kukula kofanana (monga, 1/2-inch kapena 1-inch), nthawi zambiri zimapindula ndi zinthu zamphamvu padziko lonse lapansi, zomwe zimapangitsa kuti nthawi yotsogolera ikhale yochepa kwa sabata imodzi mpaka itatu. Komabe, malo ogulitsira amasintha kwambiri pazinthu zapadera. Zolumikizira zopangidwa kuchokera ku zitsulo zakunja monga Monel, Hastelloy, kapena Duplex zosapanga dzimbiri nthawi zambiri zimafuna kupanga mwamakonda. Maoda apaderawa amatha kupititsa nthawi yotsogolera mpaka masabata 10 mpaka 14 ndipo nthawi zambiri amakhala ndi ma MOQ a mayunitsi 100 kapena kuposerapo. Ogula ayenera kuphatikiza nthawi yayitaliyi mu ndondomeko zawo za polojekiti ndikuganizira zokhazikitsa mapangano oyendetsera zinthu (VMI) kuti ateteze ku kugwedezeka kwa unyolo wopereka.

Mtengo wonse wa umwini

Kuwunika Mtengo Wonse wa Umwini (TCO) ndikofunikira kwambiri posankha njira zolumikizirana ndi ulusi m'malo mwa njira zina zolumikizidwa. Ngakhale mtengo woyamba wa unit wa ulusi ungafanane ndi unit wa socket weld, ndalama zoyikira zimasiyana kwambiri.

Popeza zolumikizira zokhala ndi ulusi zimachotsa kufunikira kwa ntchito yapadera yowotcherera ndi kuyesa kosawononga (NDT), ndalama zoyikira pasadakhale zimachepetsedwa kwambiri. Kuphatikiza apo, chikhalidwe chawo cha modular chimachepetsa kwambiri maola ogwira ntchito ofunikira pakusintha kwa makina mtsogolo kapena kukonza nthawi zonse.

Njira yogulira yogwirizana ndi ntchito zosiyanasiyana

Kukonza bwino kugula zinthuzi kumafuna njira yogulira yogwirizana komanso yogwirizana. Magulu a mainjiniya ayenera kufotokoza magawo enieni aukadaulo, ogwira ntchito yokonza zinthu amapereka zambiri zakale zokhudza kuchuluka kwa kulephera ndi kugwiritsa ntchito mosavuta, ndipo akatswiri ogula zinthu amakambirana mitengo ndi zinthu. Mwa kukhazikitsa mfundo zogulira zogwirizana, mabungwe amatha kupewa malo osungira zinthu omwe nthawi zambiri amabweretsa kugula zinthu zotsika mtengo komanso zosatsatira malamulo. Kafukufuku wamakampani akuwonetsa kuti kulumikizana kwamphamvu pakati pa ntchito zosiyanasiyana panthawi yosankha ogulitsa kungachepetse nthawi yonse yogulira ndi 25%, pomwe nthawi yomweyo kuchepetsa chiopsezo cha kulephera pambuyo pokhazikitsa.

Kusankha komaliza ndi kuvomereza

Chimaliziro cha njira yogulira ndi gawo lomaliza losankha ndi kuvomereza. Gawoli limagwira ntchito ngati chipata chabwino kwambiri, kuonetsetsa kuti zida zolumikizira mapaipi zomwe zasankhidwa zikukwaniritsa zofunikira zonse za polojekiti, zoletsa bajeti, ndi nthawi yotumizira isanaperekedwe mwalamulo.

Mndandanda wazinthu zomwe zikuyenera kuvomerezedwa komaliza

Pofuna kupewa zolakwika zogulira zinthu zodula, ogula ayenera kugwiritsa ntchito mndandanda wokwanira wazinthu zomwe zafotokozedwa panthawi yowunikira komaliza. Mndandandawu uyenera kulamula kuti utsatire miyezo ya ASME kapena ISO yofunikira 100%, kutsimikizira mtundu weniweni wa ulusi, mtundu wa zinthu, ndi kalasi yokakamiza. Owunikira ayenera kutsimikizira kuti wogulitsa wapereka zikalata zokwanira, kuphatikiza ma MTR ndi satifiketi yoyesera madzi ngati kuli kofunikira. Kuphatikiza apo, mndandandawu uyenera kutsimikizira kuti miyeso yeniyeni ndi zololera zikugwirizana ndi ndondomeko ya mapaipi a dongosolo lonse. Kudumpha kutsimikizira kokhwima kumeneku kungayambitse kulandira zinthu zosagwirizana, zomwe zimapangitsa kuti polojekiti ichedwe kwambiri komanso kuopsa kwa chitetezo panthawi yoyambitsa.

Kugwirizanitsa uinjiniya, kukonza, ndi kugula

Kugwira ntchito komaliza kovomereza kumafuna mgwirizano wosasunthika pakati pa madipatimenti a uinjiniya, kukonza, ndi kugula. Uinjiniya umapereka chitsimikizo chotsimikizika chaukadaulo, kutsimikizira kuti zolumikizirazo zithana ndi kupsinjika ndi kutentha kwa ntchito. Kukonza kumatsimikizira kukhazikika kwa zigawo kuti zitsimikizire kuti zikugwirizana ndi zomwe zilipo kale m'fakitale, kuchepetsa kufunika kosunga zinthu zina zosafunikira. Kugula kumamaliza mawu amalonda, kutsimikizira kuti nthawi yotsogolera ikugwirizana ndi nthawi yomanga kapena yosinthira. Pa mapulojekiti akuluakulu, njira yovomerezeka iyi ya masitepe atatu (yaukadaulo, yamalonda, ya QA) nthawi zambiri imafuna masiku 5 mpaka 7 abizinesi kuti ichitike bwino. Pokhazikitsa kulinganiza kokonzedwa kumeneku, mafakitale amaonetsetsa kuti akupezazolumikizira mapaipi zodalirika kwambirizomwe zimathandiza kuti ntchito ikhale yabwino kwa nthawi yayitali.

Mfundo Zofunika Kwambiri

• Zomaliza zofunika kwambiri ndi chifukwa chake zida zolumikizira mapaipi zolumikizidwa
• Mafotokozedwe, kutsata malamulo, ndi macheke owopsa oyenera kutsimikiziridwa musanachite izi
• Njira zotsatila zogwira mtima komanso machenjezo omwe owerenga angagwiritse ntchito nthawi yomweyo

Mafunso Ofunsidwa Kawirikawiri

Kodi ndi liti pamene zipangizo zolumikizira mapaipi okhala ndi ulusi zimakhala chisankho chabwino kwambiri pamakina a mafakitale?

Ndi abwino kwambiri pa mapaipi ang'onoang'ono, nthawi zambiri NPS mainchesi awiri ndi pansi, komwe mukufuna kulumikizana kodalirika kopanda weld komanso njira yosavuta yosamalira.

Kodi ndingasankhe bwanji zinthu zoyenera zolumikizira mapaipi opangidwa ndi ulusi?

Lumikizani zinthuzo ndi zinthu zolumikizira ndi kutentha: 316 zosapanga dzimbiri zogwiritsidwa ntchito powononga, chitsulo cha kaboni chogwiritsa ntchito nthunzi kapena mpweya wosawononga, ndi mkuwa wogwiritsa ntchito makina omwe ali ndi poizoni wochepa komanso kutentha kochepa.

Kodi ndingathe kusakaniza zolumikizira mapaipi a NPT ndi BSP?

Ayi. NPT ndi BSP zili ndi mitundu yosiyanasiyana ya ulusi ndipo siziyenera kusakanikirana, chifukwa zimatha kuchotsa, kupangitsa ndulu, ndikupanga njira zotulutsira madzi.

Ndi kalasi iti ya kupanikizika yomwe ndiyenera kusankha pa zolumikizira mapaipi okhala ndi ulusi?

Sankhani kalasi yomwe imakwaniritsa kapena kupitirira mphamvu ya makina ndipo imagwirizana ndi nthawi ya chitoliro. Zosankha zodziwika bwino ndi kalasi 2000, 3000, ndi 6000 kutengera ntchito.

N’chifukwa chiyani tikufuna kupeza zipangizo zolumikizira mapaipi kuchokera kwa opanga apadera monga nbfh-metal.com?

Wogulitsa wapadera angapereke njira zolerera ulusi zolimba, kutsata zinthu, ndi chithandizo choyang'ana kwambiri pa ntchito, zomwe zimathandiza kuchepetsa kutayikira ndi mavuto okonza ntchito zamafakitale.