Butt Weld Fittings
Akụrụngwa: Carbon Steel, Alloy Steel, igwe anaghị agba nchara, Duplex / Super Duplex
Oke oke: ½″ - 48″
Ọkpụrụkpụ mgbidi: SCH 5 - SCH XXS
Ụdị: elbows (45 degrees, 90 degrees, 180 degrees), Tees, Reducers, Caps, Crosses, Stub Ends
Akwụsị: Nkwụcha agbagoro (ọkọlọtọ), ngwụcha dị larịị dị
Ọgwụgwọ Okpomọkụ: Haziri ahazi, Annealed, Akwụsị & Iwe, Akwụsịla Ngwọta
Nnwale & QA: Nyocha akụkụ, NDT (UT, MT, PT, RT), Hydrostatic
Ngwa: Mmanụ & gas, kemịkalụ, ike, ọgwụgwọ mmiri, ọkpọkọ ụlọ ọrụ
Ngwa ngwa weldbụ weld - ihe ndị na-eme ngwụcha (elbows, tees, reducers, caps, stub ends) eji wuo zuru ezu-njikọ penetration welded na nhazi na ahịrị nnyefe. Isi uru ịzụrụbutt weld oyiyi akwabụ dimensional repeatability-etiti{1}ga -njedebe, bevel geometry, na nhazi nhazi oge{3} ya mere welding ubi, NDT, na inye ọrụ nwere ike soro ITP na-enweghị mma{4}} rụkwaa ọrụ. Octal Pipe na-enye ASME / ASTM / EN dabara adaba na ọgwụgwọ okpomọkụ edepụtara, nhọrọ NDT, yana MTC traceable maka mwepụta oru ngo.
Ọkpụkpọ Octalna-arụpụtabutt weld ọkpọkọ oyiyi akwamaka mmanụ & gas, petrochemical, ike, na ọrụ mmiri. Anyị na-emepụta DN15-DN1200 incarbon ígwè (ASTM A234 WPB/WPC, P235GH), alloy ígwè (ASTM A234 WP11/WP22, P91/P92), na igwe anaghị agba nchara (ASTM A403 WP304/304L/316/316L), nke nwere ikike nke 10,000 tọn kwa ọnwa.
Mmepụta & njikwa ogo:
- Emebere na ikpo ọkụ{0} ka a na-emeso ya maka ike na ịdịte aka na-agbanwe agbanwe
- Nyochaa akụkụ na-eji calipers, micrometers, na gauges iji hụ na ọ dabara nke ọma
- Nyocha UT (ultrasonic) maka ịdị mma weld, yana100% nke welds enwetara ntụpọ{1} n'efu
- Nnwale ihe na igwe spectrometers na igwe nyocha igwe iji chọpụta ihe mejupụtara kemịkalụ na ihe eji arụ ọrụ
Nkwado nka na ụzụ gụnyere:
- Ịhọrọ ihe ziri ezi na nhazi oge maka nnukwu nrụgide ma ọ bụ gburugburu gburugburu
- Ndụmọdụ na ịgbado ọkụ na nwụnye omume maka ire ụtọ eruba na ogologo ndụ ọrụ
Ejila akwa akwa anyị rụọ ọrụ EPC n'ofe Middle East, Africa, na America, na-ezute ụkpụrụ ASME, ASTM na ISO, ma nyefee ya na nhazi nhazi.

Ọkọlọtọ na akara ngosi ihe
| Ihe | Nbunye a na-ahụkarị (ọkụ Octal) |
|---|---|
| Ụkpụrụ | ASME B16.9, ASTM A234/A403, EN 10253 (gbakwunyere MSS SP-43 ebe ọdabara) (Octal Pipe Co., Ltd.) |
| Akụrụngwa | Carbon / alloy / igwe anaghị agba nchara; duplex na arịrịọ (Octal Pipe Co., Ltd.) |
| Oke oke | 1/2"-48" (DN15-DN1200) (Octal Pipe Co., Ltd.) |
| Mgbidi (nhazi oge) | SCH 5 ruo XXS (Octal Pipe Co., Ltd.) |
| Ụdị | 45/90/180 elbows, tees, reducers, caps, cross, stub end (Octal Pipe Co., Ltd.) |
| Akwụsị | Beveled kwụsịrị ọkọlọtọ; njedebe dị larịị (Octal Pipe Co., Ltd.) |
| Nhọrọ QA | Nyocha akụkụ + UT/MT/PT/RT kwa ITP; hydro/pneumatic na-arịọ (Octal Pipe Co., Ltd.) |
Nha: ½″ - 48″
Ọkpụrụkpụ mgbidi: SCH 5 ruo SCH XXS
Akwụsị: Beveled (ọkọlọtọ), Plain Ends (pụrụiche)
Dakọtara na flanges, valvụ, na ọkpọkọ na sistemu agbakwunyere
Ụdị Ngwado Weld Butt
| Ụdị dabara adaba | Ụdị dị iche iche (ihe ị ga-akpọ) | Ihe a na-eji eme ya na saịtị (ọnọdụ ihu igwe) | Nkọwa nkọwa igodo iji zere ịrụgharị ọrụ |
|---|---|---|---|
| Nkịtị | 45 degrees / 90 degrees / 180 degrees; LR (1.5D)vsSR (1.0D) | Ụzọ n'akụkụ racks, ndị na-ehi ụra, skids; debe mkpọda/mmiri n'usoro na ahịrị ịba uru | KwenyeLR vs SR, NPS/SCH (ma ọ bụ OD × WT), na bevel kwa ọkọlọtọ dabara adaba{0}} elu anaghị achọ egweri |
| Tees | Nhata tee / Na-ebelata tee | Wepụ ndị nkụnye eji isi mee gaa na tie ngwa / akụrụngwa{0}}; kpụrụ spool alaka | Ezipụta nha alaka nke ọma; gosioge alaka alakana ndidi ka ndakọrịta alaka alaka anaghị emeghe oghere mgbọrọgwụ |
| Ndị na-ebelata | Concentric / Eccentric (flat{0}}na-elu / flat{2}}na-ala) | Concentric maka ahịrị kwụ ọtọ; eccentric maka mgbapụta mmiri na mmiri na-agba ọsọ | Steetinghazi(FOT/FOB) + usoro mgbanwe iji gbochie akpa ikuku ma ọ bụ mkpọda mkpọda |
| Okpu | Okpu ọkọlọtọ; mgbidi dị arọ / okpu nrụgide | Mechie ọkpọkọ maka ihe mkpuchi hydrotest, ndị nwụrụ anwụ{0}}ngwụcha, tie n'ọdịnihu{1}}ins | Dakọtara okpu nausoro ọkpọkọ; kwadoro nkwado ngwụcha ka okpu ghara ịghọ ihe dị mkpa - na{1}} nsogbu weld siri ike |
| Ofe | Ofe nha nhata / mbenata obe (nke na-adịkarịghị) | Ngwakọta kọmpat na ngwá ọrụ na-ewepụ{0} mgbe oghere siri ike | Kwenye ike na ọ ga-ekwe omume: obe na-enwe mmetụta maka nnabata akụkụ- na-akakarị mma iji tees abụọ belụsọ ma spec chọrọ obe. |
| Njikọ stub agwụ / n'apata ụkwụ | Ụdị mkpụmkpụ/ogologostub nsọtụ; eji na apata ụkwụ- nkwonkwo flange | Ndozi mmezi ugboro ugboro, njikọ ọkpọkọ nwere ahịrị, atụmatụ nnabata corrosion | Kpọpụta okuụkpụrụ, ogologo ihu, na mating flange ọkọlọtọ mere bolt{0}} elu na gasket oche bụ amụma |

Usoro nrụpụta Butt Weld Fittings (usoro ụlọ ọrụ)
- Na-akpụ (ịkụda / ịpị ọkụ):A na-emepụta oghere dabara adaba n'ime ikpere / tee / mbelata udi. Nzọụkwụ a na-ekpebikarị ịdị n'otu mgbidi na geometry bụ isi, ya mere ọ na-emetụta ozugbo{1}butt weld ọkpọkọ oyiyi akwa.
- Ịcha na ịkpụzi:A na-akpụcha oghere ahụ a kpụrụ akpụ wee kọwapụta ya na akụkụ ebumnuche (dịka ọmụmaatụ, etiti-ruo{3}}ngwụcha na ogologo n'ozuzu ya). Nhazi na-agbanwe agbanwe na-eme ka nrụpụta spool nwee ike ikwugharị{5} karịsịa na ọrụ skid nwere ọtụtụ nkwonkwo ugboro ugboro.
- Nkwadebe beveling na ngwụcha:A na-arụkwa ngwụcha weld na profaịlụ bevel achọrọ yana njedebe squareness. Stable ọgwụgwụ prep na-enyere ndị welders aka ijide ọnọdụ mgbọrọgwụ na-agbanwe agbanwe; ọ na-aghọ ọbụna ihe mmetụta mgbebutt weld tube oyiyi akwabụ OD×WT nyere iwu ya, a na-atụkwa anya na ọ dabara nke ọma- elu.
- Ọgwụgwọ okpomọkụ (site n'ọkwa ihe):A na-etinye normalizing / annealing / annealing annealing dị ka ihe na ọkọlọtọ chọrọ. Makaigwe anaghị agba nchara butt weld ọkpọkọ oyiyi akwa, ọgwụgwọ okpomọkụ ziri ezi bụ akụkụ nke ntọala ntọhapụ maka weldability na nnabata ihe onwunwe.
- Emecha elu elu + mwepụta ikpeazụ:A na-ekpocha ihe ndị na-adịghị ahụkebe / na-ehicha ya, mgbe ahụ, a na-enyocha nza ahụ, kaa ya akara, ma wepụta ya na akwụkwọ nwere ike ịchọta (MTC / lot mapping) ka enwere ike ịnakwere mbupu ahụ ka a na-achịkwa ya.butt weld oyiyi akwa, ọ bụghị agwakọta rụrụ iberibe.
Nyocha & Nkwenye Ogo
Octal Pipe na-akwado mmemme njikwa ogo ọkwa ọtụtụ{0} site na akụrụngwa ruo na dabara adaba:
| QC ihe | Ihe anyị na-enyocha | Ọnụ ọgụgụ njikwa / nnabata ndị ahịa na-eji | Ihe ị na-enweta na ngwugwu ntọhapụ |
|---|---|---|---|
| Nyocha nke kemistri (PMI/OES) | Nkwanye ọkwa iji gbochie ngwakọta{0}} (esp{1}}L/316L) | 100% okpomọkụ -ọkwankwenye; n'ihi na agwakọtara -ọkwa ọkwa ọtụtụ ndị na-azụ ahịa chọrọ100% nke PMI | Akuko PMI/OES + ikpo ọkụ/nza nke eserese |
| Nnwale igwe | Tensile / mkpụrụ / elongation (kwa okpomọkụ / otutu) | 1 set kwa okpomọkụ(ma ọ bụ kwa nza) dị ka ntọala; ule ndị ọzọ kwa ITP maka ọrụ dị oke mkpa | MTC + akụkọ nyocha ụlọ nyocha |
| Billet/body UT (laminations) | Ịdị mma nke ime tupu/mgbe emechara | Ọtụtụ mgbe akọwapụtara dị ka100% UT nyochamaka akwa akwa ma ọ bụ mgbidi dị arọ | Akuko UT nwere oke + nsonaazụ nnabata |
| njikwa akụkụ | OD/ID, WT, ovality, etiti-ruo{1}} ngwucha | Njikwa ụlọ ahịa a na-ahụkarị:ovality Ihe na-erughị 1.0% nke OD; WT abụghị n'okpuru aha site> 12.5%(iwu kacha nta nkịtị); etiti -ruo{1}} ngwụcha enyocha kwa B16.9/EN 10253 | Mpempe akwụkwọ nyocha akụkụ (ọtụtụ{0} dabere) |
| Bevel & ngwụcha nkwadebe | Bevel akụkụ / mgbọrọgwụ ihu / squareness | Ndabere bevel nkịtị (ụdị ASME B16.25):37.5 ogo ± 2.5 ogo; mgbọrọgwụ ihu a~ 1.6 mm (1/16")(ọrụ nwere ike imechi); njedebe squareness na-achịkwakarị kaIhe na-erughị ma ọ bụ hà nhata 1.0 mm | Kwụsị- ndekọ nyocha nkwadebe + foto achọrọ |
| Njikwa ọgwụgwọ okpomọkụ | Normalizing / annealing / solution annealing (dị ka ọ dị) | Ọkụ traceability na-achịkwa okirikiri; ọtụtụ ndị nwe na-arịọ makaeserese okpomọkụ kwa ogbena nlele ike siri ike ebe achọrọ | Okpomọkụ - chaatị ọgwụgwọ / ndekọ + akụkọ ike (ọ bụrụ na akọwapụtara ya) |
| Nyocha elu | Mpịakọta, laps, cracks, inclusions | 100% anya; maka igwe anaghị agba nchara "elu ala dị ọcha" na-edekarị n'ime PO (enweghị ọnụ ọgụgụ agbakwunyere, enweghị akụkụ dị nkọ / burrs) | Ndepụta nlele anya |
| NDT (kwa ihe & ITP) | MT/PT/UT/RT dị ka achọrọ | Ụdị ITP ahụkarị:MT/PT 100%n'elu ihe dị egwu;RT 10-100%naanị mgbe etinyere akwa akwa / mgbe ITP kpọrọ ya | Akụkọ NDT nwere oke mkpuchi + nsonaazụ |
| Nnwale nrụgide / ntapu (mgbe achọrọ) | Hydro/pneumatic | Ọ bụrụ na akọwapụtara ya: hydro common1.5 × nrụgide imewe; jide oge mgbe mgbeKarịrị ma ọ bụ hà nhata 30-120 s(ITP{0}}kọwara) | Akuko nnwale (nrụgide/njide/oge/ọtụtụ) |
Uru nka
- Mbupute olu dị elu kwụsiri ike:Octal Pipe na-agba ọtụtụ ahịrị ahịrị afọ- gburugburu iji mee ka ọkọnọ kwụ ọtọ maka ngwungwu EPC buru ibu{1}} elbows, tees, reducers, and caps{2} na-emepụtaghị nrụgide oge na saịtị.
- Ọdịmma dabara adaba ọzọ{0}:Njikwa usoro na-elekwasị anya na akụkụ ndị welders na-enwe n'ezie n'ọhịa-Ịdị nha nha mgbidi, njikwa ovality, yana geometry bevel na-agbanwe agbanwe-Ya mere, ihe nrụnye ọkpọkọ butt weld dabara nke ọma na nsọtụ ọkpọkọ wee belata egweri/arụ ọrụ n'oge ịgbado ọkụ.
- Nkwụsị inline-Mmekọrịta nkwado (bevel dị ka ihe a na-achịkwa):Kama ewere beveling dị ka nzọụkwụ ikpeazụ-nkeji", Octal Pipe na-eji njedebe raara onwe ya nye - chere ihu/beveling ọdụ nwere nlele angle/land, na-edobe profaịlụ bevel na-agbanwe agbanwe n'ofe nza{2}}ka ọnọdụ mgbọrọgwụ wee kwụsie ike n'oge RT/UT{3}} nnabata weld.
- Ịmepụta + okpomọkụ{1}}ọzụzụ ọgwụgwọ na ọkwa ahịrị:A na-emepụta elbows/tees/ reducers site n'ụzọ a na-achịkwa nke ọma na okpomọkụ dakọtara{0} usoro ọgwụgwọ (normalizing/annealing/solution annealing by grade), na-echekwa ogbe traceability site n'ọdụ ụgbọ mmiri ọ bụla{1} ya mere akụrụngwa na weldability na-emegharị ugboro ugboro, ọ bụghị dabere na omume onye ọrụ.
- Nkwado injinia na-egbochi ịtụ mmejọ:Tupu mbupu, Octal Pipe nwere ike nyochaa isometrics/MTO iji gosi LR/SR, concentric vs eccentric nghazi, nhazi oge mgbanwe, na kwụsị{0}ọchịchọ nkwadebe{1}} na-ezere igbu oge "ụdị dabara adaba" nke na-apụta naanị na dabara- elu.
- Mbupụ - nchebe dị njikere:Akara ahaziri ahazi, nchebe njedebe, na ngwugwu ngwugwu/crate na-echekwa bevels na ihu mkpuchi mgbe a na-ejikwa ya, ya mere akwa akwa na-abịarute njikere maka ịnata nyocha na ịgbado ọkụ kama imetụ aka- ọrụ.

Butt Weld Fittings "Dabara -Map Risk Risk" (Pipe vs Tube vs Stainless)
Ngwunye ọkpọkọ butt (ngwugwu ọkpọkọ):
- N'imebutt weld ọkpọkọ oyiyi akwa, isi ihe nchịkwa bụnhazi oge{{0}Ihe dabara adaba ga-adakọrịrị na ezinaụlọ OD/WT nke ọkpọkọ ka a ghara ịmanye welder ka ọ "mee ka ọ dabara" site n'igwe ala mgbọrọgwụ ma ọ bụ imepe oghere ahụ. Na ngwugwu Octal Pipe, anyị na-akwadokarịNPS + usoro (ma ọ bụ OD × WT)ma kpọchie ọkọlọtọ dabara adaba (dịka ọmụmaatụ, B16.9) ka etiti-na-ngwụcha na bevel geometry na-anọgide na-agbanwe agbanwe n'ofe ọsọ spool.
Ihe nrụnye butt weld tube (ihe egwu na-adabara tube OD):
- Butt weld tube dabara adababụ ebe ọrụ na-efunahụ oge n'ihi na "okwu nha" nwere ike zoo usoro OD dị iche iche. Tube - dabere na BOM na-ekwukarịOD × WT ozugbo, mgbe ọkpọkọ {{0} BOM dabere na-ejiNPS/SCH- na obere ndakọrịta na-aghọ nnukwu ihe dabara{1} nsogbu mgbe ọtụtụ nkwonkwo na-agbado ma ọ bụ na-arụ ọrụ na skids. Ndozi bara uru dị mfe: na-emeso eriri tube dị kaOD- ihe ndị a na-achịkwama kọwaa ọkọlọtọ OD mating tube (yana kpọmkwem OD × WT) na PO, ọ bụghị naanị nha aha.
Igwe anaghị agba nchara butt weld ọkpọkọ (ihe egwu mwepụta abụghị naanị ọkwa):
- Makaigwe anaghị agba nchara butt weld ọkpọkọ oyiyi akwa, ọdịda a na-ahụkarị abụghị "316L ezighi ezi"-ọ bụ ntọhapụ na imepụta ihe na-eju anya: ọnọdụ elu nke na-ada n'oge nchekwa, okpomọkụ{2} na-emetụta okwu ndị na-eme ka ịgbado ọkụ, na ngwakọta {{3} ọtụtụ traceability na-ebelata nleba anya. Octal Pipe na-edobe nyocha ntọhapụ igwe anaghị agba nchara - enyi na enyi site na mezie PO naọkwa doro anya (304L/316L)gbakwunyereimecha / ihicha atụmanya, na mbupu naotutu maapụ (akara → MTC)yabụ enwere ike ịhazi akwa akwa site na okpomoku na nha na-enweghị nhazigharị{0} n'ala ụlọ ahịa.
Ngwa / Ihe ngosi n'ihu ọrụ (Ebe a na-eji ihe ndozi butt weld n'ezie)
- Mechie tie{0}}ins na ahịrị rack (brownfield revamps):
Ndị ọrụ ụgbọ mmiri na-ebikarị90 ogo LR ikpere + na-ebelata teesiji tụgharịa n'akụkụ nkwado, gbakwunye mgbakwunye ngwa{0}, ma ọ bụ kechie skid ọhụrụ n'ime nkụnye eji isi mee dị n'oge windo mpụpụ. Ihe ịma aka "ezigbo" dabara adaba{2}ọsọ ọsọ{3}} ma ọ bụrụetiti - ruo - ngwuchama ọ bụ bevel na-ekwekọghị ekwekọ, welders ejedebe na-egweri ala / mgbọrọgwụ oghere, na nkwonkwo na-esiwanye ike gafere RT/UT. Na ngwugwu Octal Pipe, anyị na-edobe ihe dabara adaba site naNdepụta ahịrị ISO(nha / nhazi oge / ihe onwunwe), ya mere ndị na-agbado ọkụ nwere ike ịhọrọ ikiaka / tee kwesịrị ekwesị maka spool na-enweghị ịgwakọta mgbidi.
- Prefabrication Pipe spool maka skid modular (welds ugboro ugboro, nnabata siri ike):
Ụlọ ahịa skid na-eme ọtụtụ narị nkwonkwo ugboro ugboro-ndị na-ebelata concentric, okpu, tees na mkpirisi - radius elbows- ebe otu usoro ihe omume na-ezighi ezi nwere ike ịbanye n'imegharị n'ogbe dum. Na omume, ihe ize ndụ dị "mgbanwe{2} na{3} dị oke arọ" nke na-amanye mgbanwe mgbanwe etiti- ọsọ na ngwa ngwa mmepụta. Octal Pipe na-akwado imepụta skid site na itinye PO naNPS/SCH (ma ọ bụ OD × WT)ma na-ebuga akwa akwa nwere akara doro anya yana ọtụtụ mkpọ mwepụta nke mapụtara, yabụ spools na-adịgide adịgide site na weld nke mbụ ruo hydrotest ikpeazụ.
- Usoro mmịpụta/mmiri mgbapụta na-aga (nhazi{0}}ihe ndị nwere mmetụta):
N'ọdụ ụgbọ mmiri na usoro nhazi,eccentric reducersa na-eji ya kpọmkwem iji zere akpa ikuku ma nọgide na-aṅụ mmiri siri ike- na-emekarịlarịị{0}}n'elu{1}} (FOT)n'ahịrị ahịrị mmiri kwụ ọtọ, na ihe mgbakwasa / tees na-adaba na mkpọda mmiri. Ihe mgbu n'ihu ọrụ abụghị "onye na-ebelata ihe dị," ọ bụ na onye na-ebelata ahụ na-abịarute na-enweghị nhazi akọwapụta, ya mere ndị otu egwuregwu na-atụgharị ya na-ezighị ezi ma mesịa chụpụ vibration / cavitation ma ọ bụ nsogbu drainage. Ọkpụkpọ Octal na-akwadokarị nghazi nghazi nke mbelata (FOT/FOB) n'oge a na-ehota okwu iji gbochie mgbazi saịtị ahụ a na-ezere.
- nkụnye eji isi mee ihe dị elu{{0}okpomọkụ (steam, okpomọkụ{1}}nfefe, njikọ kpo oku):
Ngwungwu ndị a na-adabere kpamkpam na ndị na-ebelata, tees, na elbows nke ga-adakọrịrịrịrị n'usoro nhazi ọkpọkọ na ikpo ọkụ{0}} steeti ọgwụgwọ. A na-elekwasịkarị anya nyochatraceability ihe + okpomọkụ{1}}ihe akaebe ọgwụgwọ + NDT obosaran'ihi na ndị nwe ha achọghị ka etinyere akwa akwa na-enweghị akwụkwọ na nkụnye eji isi mee nke ga-agbagharị n'ọkụ ruo ọtụtụ afọ. Ọkpụkpọ Octal na-ebufekarị alloy dabara adaba yana ihe akaebe ntọhapụ etinyere na akara ka onye nwe ya wee nwee ike ikpochapụ batch ahụ na-enweghị isi ihe.
FAQ

Ajụjụ: Akpụkpọ ụkwụ butt weld fittings vs butt weld tube fittings butt weld tube fittings - kedu ihe dị iche?
Ajụjụ: Kedu ihe nrụnye ọkpọkọ butt weld na-abịakarị (na gịnị ka a ga-enyocha tupu ọ dabara-elu)?
Ajụjụ: Kedu ka ihe dabara adaba B16.9 ga-esi dị gịrịgịrị na usoro ọkpọkọ (mgbidi{1}} njikwa oke)?
Ajụjụ: Maka igwe anaghị agba nchara butt weld ọkpọkọ, kedu ihe a ga-akọwapụta iji zere ezighi ezi{0} mwepụta ọkwa ọkwa (304L vs 316L)?
Asambodo

Asambodo CE

Asambodo ISO 9001

Asambodo API Q1

Asambodo ABS

Asambodo AP-5L

Asambodo API-5CT
Ụkpụrụ:ASME B16.9, ASTM A234, ASTM A403
Akụrụngwa:Carbon, Alloy, igwe anaghị agba nchara, Duplex Steel
Nha: ½″ – 48″
Usoro mgbidi:SCH 5 – XXS
Ụdị:Nkịtị, Tee, Mbelata, Okpu, Obe, Ọgwụgwụ Stub
Njikọ:Butt weld (ọkọlọtọ), Socket/Threaded (obere nha)
Ihe nchịkọta dị ọkụ: Ngwakọta ọkpọkọ butt , China Butt Weld Fittings ndị na-emepụta ihe, ndị na-ebu, ụlọ ọrụ
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