Ukusebenza kwamapayipi ezindaweni ezibandayo kuletha inselelo ezahlukene zobunjiniyela ezidinga ukuhlela ngokucophelela kanye nokukhethwa kwezingxenye ezikwazi ukumelana nengcindezi enkulu yemvelo. Lapho amazinga okushisa ehla kakhulu ngaphansi kweqhwa, izinto ezisetshenziswayo ezinhlelweni zamapayipi zingashintsha kakhulu ezimfanelweni zazo zomshini, okuholela ekubeni zibe sengozini yokuphuka kalula nokuma okungalindelekile. Lokhu kuyiqiniso ikakhulukazi kuma-couplings, ayizindawo ezibalulekile zokuxhuma lapho ukugcwala kwengcindezi kwenzeka khona ngokwemvelo nalapho izingozi zokuvuza, ukuqhuma, nokonakala kwesakhiwo zivelele kakhulu. Umcimbi wokuqina noma ukuphuka kalula emazingeni okushisa aphansi akuyona nje into yethiyori kodwa usongo olungokoqobo olubangele ukwehluleka kwamapayipi amaningi emhlabeni wonke, okuholela ekulungiseni okubizayo, ukungcoliswa kwemvelo, nezingozi zokuphepha kubasebenzi. Ukuqonda ukuthi izimo ezibandayo zithinta kanjani ukuziphatha kwezinto kubaluleke kakhulu kunoma iyiphi inhlangano ehileleke ekuklameni, ukufaka, noma ukunakekela amanethiwekhi amapayipi ezimbonini ezindaweni ezibandayo, ezingaphansi kwe-arctic, noma ezindaweni eziphakeme. Lesi sihloko esibanzi sihlola ubunkimbinkimbi bokukhethwa kwezinto zama-couplings angaphuki kalula, sinikeza amathiphu asebenzayo nokuqonda okusebenzisekayo okungasiza ukuqinisekisa ukuqina kwamapayipi esikhathi eside ngisho nasezindaweni ezinzima kakhulu.

Ubukhulu bemiphumela yokushisa okubandayo ezingqalazweni zamapayipi akwazi ukweqiwa, njengoba amazinga okushisa ezifundeni ezinjengeNyakatho yeCanada, iSiberia, i-Alaska, neScandinavia engaba ngaphansi kuka-minus amashumi amane degrees Celsius isikhathi eside. Ezimweni ezinjengalezi ezinzima, izinto zokuxhuma ezijwayelekile ezisebenza kahle ezingeni lokushisa legumbi zingaba buthakathaka ngendlela eyingozi, zilahlekelwe ukunwebeka nokumelana nomthelela cishe ngobusuku obunye. Lokhu kuziphatha kuxhumene ngqo nesakhiwo se-crystallographic sezinsimbi nendlela ama-dislocation ahamba ngayo ngaphakathi kwe-lattice yezinto lapho amandla okushisa encipha, okwenza kube nzima ukuthi insimbi imunce amandla omthelela futhi iguquke ngaphambi kokuqhekeka. Ngaphandle kwengozi esheshayo yokwehluleka kwemishini, ama-coupling abuthakathaka abuye abeke engcupheni lonke uhlelo lwamapayipi ngokudala izindlela zokuvuza ezivumela amanzi ukuthi angene futhi abe yiqhwa, abuye andise imifantu ngokwanda kweqhwa nokushintshashintsha kokushisa. Ngakho-ke, ukusebenzisa indlela ehlelekile ekukhetheni ama-coupling amelana nokuphuka akusikho nje ukuthuthuka kwezobuchwepheshe kodwa kuyimfuneko eyisisekelo yokuphepha kokusebenza nokusimama kwezomnotho emaphrojekthini amapayipi ezindaweni ezibandayo. Ezingxenyeni ezilandelayo, sihlola isayensi eyisisekelo yokuphuka kwezinto, izici ezibalulekile eziqondisa ukukhethwa kwezinto, nezixazululo ezinikezwa yiVaricpand International ukubhekana nalezi zimo ezinzima.

Ubungqabavu bezinsimbi ngokuyisisekelo buchazwa ukuthambekela kwento ukuphuka ngaphandle kokuguquka okuncane noma okungenalutho, okusho ukuthi into ihluleka ngokuzumayo nangomonakalo omkhulu kunokuba igobe, yelule, noma ivele ngendlela elawulekayo ngaphambi kokuhluleka. Emazingeni okushisa ajwayelekile okusebenza, izinsimbi eziningi zokwakha zibonisa ukuziphatha okuguquguqukayo, zimunca amandla amaningi ngokuguquka ngaphambi kokuba zigcine ziphuke, okunikeza izimpawu zokuxwayisa futhi kuvumela amaqembu okunakekela ukuthi abone izinkinga ngaphambi kokuba ukuhluleka okuphelele kwenzeke. Nokho, lapho izinga lokushisa lehlela emazingeni abalulekile, ama-alloy amaningi abhekana nalokho izazi zensimbi ezikubiza ngokuthi ukuguquka kusuka ekuguquguqukeni kuye ebugqabavu, lapho indlela yokuphuka ishintsha isuka ekuqhekekeni okuguquguqukayo iye ekuqhekekeni okubulalayo ngemiphumela emibi kakhulu. Leli zinga lokushisa lokuguquka liyimpahla eyisisekelo yento ehluka kakhulu kuye ngokwakheka kwe-alloy, ukwakheka kwezinhlamvu, umlando wokwelashwa ngokushisa, kanye nokuba khona kokungcola noma okufakwe ngaphakathi kwensimbi. Isibonelo, izinsimbi ezijwayelekile zekhabhoni ngokuvamile zibonisa izinga lokushisa lokuguquka kusuka ekuvumelana kuye ebugqabavu elizungeza ukushisa okungaphansi kuka-zero ngamadigri angamashumi amabili kuya kwamashumi amane, kuyilapho izinsimbi ezingenasici ezikhethwe kahle nama-aluminium alloys zingakwazi ukugcina ukuvumelana emazingeni okushisa aphansi kakhulu, kuye ngokwakheka kwazo kwe-metallurgical. Ukuqaphela le mehluko nokuhlola idatha yangempela yokuhlolwa kwento kunokuthembela ezicacisweni ezijwayelekile kuyisisekelo sokukhetha izinto ezifanele zokumelana nobugqabavu ezihlanganisiwe zokusetshenziswa kwamapayipi ezindaweni ezibandayo.

Imiphumela yokuqhekeka okucasulayo (brittle fracture) kuma-coupling amapayipi ibucayi kakhulu ngoba ama-coupling ahlanganisa izingxenye zamapayipi ezindaweni ezingezona ezomugqa (geometric discontinuity), lapho ukugcwala kwengcindezi (stress concentrations) kukhuphula ngokwemvelo izinga lokucindezela kwendawo (local stress intensity factor) ngaphezu kwezinga lokucindezela elijwayelekile lepayipi. Uma i-coupling yehluleka ngendlela ecasulayo, ukusakazeka kokuqhekeka kushesha kakhulu, kuvame ukuhamba ngejubane lomsindo ngaphakathi kwento, futhi akukho ukuguquka okubonakalayo noma ukuncipha komumo okubonakalayo ukuxwayisa abasebenzi ngengozi ezayo. Le ndlela yokwehluleka ephazima isho ngeso lenyoni iyingozi kakhulu emapayipini athwala ama-hydrocarbon, amanzi anengcindezi, noma amakhemikhali ayingozi, ngoba ukukhishwa kokuqukethwe kungadala izimo eziqhumayo noma ukungcoliswa kwemvelo okusabalele ngaphambi kokuba izinhlelo zokuvala okuphuthumayo zisabele. Ngaphezu kwalokho, imifantu ecasulayo ingaqala emikhonzweni emincane (micro-defects), imihuzuko engaphezulu, ukungapheleli kokushisela, noma izindawo eziphakamisa ingcindezi (stress risers) ezifana nezimbobo zamabhawodi nemicu (threads) ebingeke yalimaza ezintweni ezinokunwebeka (ductile materials) kodwa iba yizindawo zokuqala eziyinhlekelele emazingeni okushisa aphansi. Ukufinyela ngenxa yokushisa (thermal contraction) nakho kudlala indima enkulu ngoba izinto ezahlukene ziyafinyela ngezinga elihlukile uma zivezwe emazingeni okushisa abandayo, kukhiqize izingcindezi ezihlukile (differential stresses) ezindaweni zokuxhuma kwama-coupling ezinezelela emithwalweni yemishini evela kwingcindezi yangaphakathi namandla angaphandle. Ngakho-ke, ukuqonda lonke uhla lwezinto ezibangela ukuqina okucasulayo (brittleness phenomena), okuhlanganisa ukuqina kokushaywa (impact toughness), ukuqina kokuqhekeka (fracture toughness), ukuzwela emikhonzweni (notch sensitivity), nemiphumela yokushisa (thermal stress effects), kubalulekile konjiniyela okumele baqinisekise ukusebenza okuthembekile kwamapayipi phakathi nezinyanga zobusika ezinzima.

Ukukhetha izinto ezifanele zokuxhuma ezingaphazamiseki kalula emazingeni okushisa aphansi (anti-brittleness coupling materials) kwamapayipi asezindaweni ezibandayo kudinga ukuhlolwa okuhlelekile kwezinto eziningi ezihlangene ezinquma ngokuhlanganyela ukuthi isixhumi sizosebenza kahle yini emazingeni okushisa angaphansi kweqanda (sub-zero temperatures) phakathi nesikhathi sokusebenza saso sonke. Into yokuqala futhi eyisisekelo kakhulu amandla okumelana nomthelela emazingeni okushisa aphansi (low-temperature impact toughness), ngokuvamile elinganiswa ngokuhlolwa kwe-Charpy V-notch noma ezinye izivivinyo ezijwayelekile zomthelela, ezilinganisa amandla amuncwa yisampula yezinto lapho ishaywa yipendulum ezingeni lokushisa elishiwo. Onjiniyela kufanele bafune idatha yokuhlolwa komthelela emazingeni okushisa okusebenza ngempela, hhayi nje ezingeni lokushisa legumbi, ngoba inani lamandla le-Charpy lingehla kakhulu njengoba izinga lokushisa lehla, futhi lokhu kwehla kukhombisa ukuqala kokushintsha kusuka ekunwebekeni kuye ekuphukeni (ductile-to-brittle transition). Into yesibili ebalulekile izinga lokushisa lokushintsha kusuka ekunwebekeni kuye ekuphukeni, okufanele ngokufanelekile libe ngaphansi kakhulu kwezinga lokushisa elincane elilindelekile lokusebenza ukuze kunikeze isikhala sokuphepha ekushiseni okungazelelwe nasezindaweni ezibandayo ezithile epayipini. Okwesithathu, izinto kufanele zinikeze amandla okumelana nokugqwala (corrosion resistance) ngokuhlanganyela namandla okumelana nokushisa okuphansi, ngoba amapayipi asezindaweni ezibandayo avame ukuthwala izinto ezinamandla ezifana namanzi anosawoti (brine), amakhemikhali okuncibilikisa iqhwa, namagesi anomswakama angasheshisa ukugqwala futhi adale ukukhubazeka ebusweni okuba yizindawo zokuqala ukuphuka. Okwesine, ukuhambisana phakathi kwezinto zesixhumi nezinto zepayipi kufanele kuhlolwe ukuze kuvinjelwe ukugqwala kwe-galvanic, ukunwebeka okuhlukile ngenxa yokushisa, nezinkinga zokushisela ezingabeka engcupheni ubuqotho bokuhlangana emazingeni okushisa aphansi. Okokugcina, inqubo yokukhiqiza nezinyathelo zokulawula ikhwalithi ezisetshenziswa umhlinzeki wezixhumi zibalulekile, ngoba izinto ezakhiwe ngokuthela (castings), ezishaywayo (forgings), nezingxenye ezicutshunguliwe zingaba nezikhala zangaphakathi, ukungcola, noma izingcindezi ezisele ezinciphisa kakhulu amandla okumelana nokuphuka kungakhathaliseki ukwakheka kwengxube yensimbi eyisisekelo.

Izinto ezisetshenziswayo ezinconwa kakhulu ekuhlanganiseni amakhophi angavimbeli ukushisa okubandayo zihlanganisa izinsimbi ezingenasici ezifana ne-304 ne-316, ezibonisa ukuqina okuhle emazingeni okushisa aphansi ngenxa yesakhiwo sazo se-face-centered cubic crystal esihlala sithambile ngisho nasemazingeni okushisa aphansi kakhulu, okwenza zibe yizinga eliphakeme embonini yokusebenza emazingeni okushisa abandayo kakhulu. Ama-aluminium alloys, ikakhulukazi lawo asesigabeni sama-6000, nawo anikeza ukusebenza kahle emazingeni okushisa aphansi futhi enza kube lula ukuthwala, okwenza kube lula ukuphatha nokufaka ezindaweni ezibandayo ezikude lapho imishini yokuphakamisa enzima ingase ingatholakali. Kodwa-ke, kumele kuqashelwe ukuthi amanye ama-aluminium alloys ane-magnesium noma i-copper ephezulu angathola ukuzwela noma ukuqina okunciphile emazingeni okushisa aphansi, ngakho-ke ukukhetha kwe-alloy emndenini we-aluminium kumele kusekelwe emiphumeleni eqinisekisiwe yokuhlolwa komthelela. Ama-brass nama-bronze alloys anikeza ukuqina okumaphakathi emazingeni okushisa aphansi nokumelana nokugqwala okuhle kakhulu, okwenza afanelekele ukusetshenziswa kwemigudu yamanzi namakhemikhali, nakuba amandla awo emishini ephansi kune-ensimbi. Ngokuphambene, izinsimbi ezingenasici ze-ferritic ne-martensitic, i-ductile iron, nezinsimbi eziningi ze-carbon ezinamandla aphezulu ngokuvamile azifaneleki ezimweni ezibandayo kakhulu ngenxa yamazinga azo aphezulu okushintsha kusuka ekuqineni kuye ekuphukeni, ngaphandle uma zelashwa ngokukhethekile noma zihlanganiswe ne-nickel ukuze kuthuthukiswe ukusebenza emazingeni okushisa aphansi. Kukho konke lokhu, umkhiqizi we-coupling kumele akwazi ukunikeza imibiko eqinisekisiwe yokuhlolwa kwezimboni kanye nemibiko yokuhlolwa komthelela yomuntu wesithathu eqinisekisa ukufaneleka kwento yokusebenza ezingeni lokushisa eliphansi elihlosiwe, futhiImikhiqizo ezinikezwa abathengisi abathembekile kufanele zibonise ngokucacile ububanzi bezinga lokushisa ezilinganiswe ngalo.

I-Varicpand International isungule ukuthi ingumhlinzeki womhlaba wonke othembekile wezixazululo zokuxhuma kwezimboni, ngohlu oluphelele lwemikhiqizo ebhekelela izidingo eziqinile zabaqhubi bamapayipi ezindaweni ezibandayo emhlabeni wonke. Ithimba lobunjiniyela benkampani liyaqonda ukuthi akukho mklamo owodwa wokuxhuma ofanelana nayo yonke into, yingakho benikela ngezinhlobonhlobo zezinhlobo zokuxhuma ezenziwe ngezinto ezikhethwe ngokukhethekile ngenxa yokusebenza kwazo emazingeni okushisa aphansi kanye nezici zokungaphuki. Phakathi kwemikhiqizo ebaluleke kakhulu yezimo ezibandayo yilezi:Ama-Coupling E-Camlock, ezitholakala ngensimbi engagqwali, i-aluminium, kanye ne-brass ukuze zihlangabezane nezinga lokucindezela elihlukile, ukuhambisana nemidiya, kanye nezidingo zokushisa, kanye ne-I-Storz Couplings, ezisetshenziswa kabanzi ezinhlelweni zamapayipi ezokucima umlilo, ezemboni, nezolimo lapho kudingeka khona ukuxhuma nokuhlukanisa ngokushesha ngisho nasezimweni ezinamakhaza. Wonke umkhiqizo we-coupling okhiqizwa yi-Varicpand udlula izinhlolovo eziqinile zokulawula ikhwalithi, okuhlanganisa ukuqinisekiswa kobukhulu, ukuhlolwa kwengcindezi, kanye nalapho kudingeka khona, ukuhlolwa komthelela wokushisa okuphansi ukuze kuqinisekiswe ukuthi impahla igcina ukuqina okwanele ezingeni lokushisa eliphansi elishiwo. Ukuzibophezela kwenkampani ebuqinisweni bezinto kukhonjiswa ngokusebenzisa izinto eziqinisekisiwe ezivela ezimbonini zensimbi nezindawo zokuncibilikisa ezihloniphekile, kanye nekhono labo lokuhlinzeka ngemibhalo ephelele yokulandeleka kumakhasimende adinga ukuqinisekisa ukuthobela izinto ngezinjongo zokulawula noma zomshwalense. Lokhu kunaka imininingwane kubeka i-Varicpand njengozakwethu othembekile ezinkampanini zobunjiniyela, osonkontileka be-EPC, nabaqhubi bezikhungo abangakwazi ukubekezelela ukwehluleka kwama-coupling ezindaweni ezikude ezinamakhaza.

Okuhlukanisa i-Varicpand International kubaphakeli bokuxhuma abajwayelekile ubuchwepheshe obujulile bokufanisa izinto zokuxhuma kanye nemiklamo nezimo zokusebenza ezithile, kuhlanganiswe nokuzimisela kwabo ukukhiqiza izixazululo ezenziwe ngokwezifiso lapho imikhiqizo ejwayelekile inganele. Inkampani igcina enkuluIsixhumanisi Se-Camlock Sensimbi Engagqwali umugqa okhethekile ofanele amapayipi okucubungula amakhemikhali, imithi, nokudla endaweni ebanda kakhulu, njengoba insimbi engagqwali inikeza ukumelana nokugqwala okuhle kakhulu futhi igcina ukuqina kwayo emazingeni okushisa aphansi kakhulu ngaphandle kwengozi yokuphuka. Kwezinhlelo lapho ukunciphisa isisindo kubalulekile, njengamasistimu amapayipi aphathwayo nemishini yokuphendula ephuthumayo okufanele ithuthwe ngendiza noma izimoto zangaphandle komgwaqo, i-Varicpand inikeza Ukuxhuma kwe-Aluminum CamlockIzinketho ezihlanganisa ukwakhiwa okulula nokusebenza okuqinisekisiwe ekushiseni okuphansi. Ngaphandle komkhiqizo ngokwawo, ithimba losizo lobuchwepheshe le-Varicpand lingasiza amakhasimende ngokukhetha izinto zokusetshenziswa, ukuqinisekisa izinga lokucindezela nokushisa, ukukhetha izinto zokuvula (gasket) zokuvala ekushiseni okuphansi, kanye nokuhola ekufakweni okubonisa izinqubo ezinhle kakhulu zezimo zase-Arctic. Inkampani futhi ishicilela izincwadi zobuchwepheshe namanothi okusebenza asiza onjiniyela ukuqonda imikhawulo yokusebenza kwezinto ezihlukene zokuxhuma, okubonisa ukuzibophezela emfundweni nasekuphepheni okudlula nje ukuthengisa izingxenye. Emabuthaneni omklamo adinga usizo lobuchwepheshe olugxile endaweni ethile noma amaphakethe emibhalo yokugunyazwa ngokomthethonqubo, onjiniyela be-Varicpand bangalungisa izitifiketi zezinto eziningiliziwe, imibiko yokuhlola, nezimemezelo zokuthobela imithetho ezisheshisa inqubo yokuthenga nokugunyazwa, njengoba kuchazwe ngokwengeziwe ngezansi.Mayelana Nathi ikhasi.

Ngisho noma izinto zokuxhuma ezihlangabezana nokuqhekeka (anti-brittleness coupling materials) zingahluleka ngaphambi kwesikhathi uma zingaphathwa kahle, zingafakwa kahle, noma zinganakekelwa kahle ezimweni ezibandayo, ngakho-ke impilo yonke yokuxhuma kufanele iphathwe ngokucophelela ukuze kugcinwe amandla ayo okusebenza emazingeni okushisa aphansi. Ngaphambi kokufakwa, izinto zokuxhuma kufanele zigcinwe endaweni efudumele noma elawulwa isimo sezulu ukuze kuvinjelwe ukuthi zibe bande kakhulu futhi zibe buthakathaka ngesikhathi ziphathwa, ngoba ngisho nezinto ezithambile zingalahlekelwa amandla okumelana nomthelela uma zishaywa noma ziwela emazingeni okushisa aphansi kakhulu. Ngesikhathi sokufaka, kubalulekile ukugwema ukusebenzisa amandla amaningi, ukushaya ngesando, noma ukugoba okubandayo kwezingxenye zokuxhuma, ngoba lezi zinto zingadala imifantu emincane, ukulimala kwengaphezulu, noma izingcindezi ezisele (residual stresses) ezingaba izindawo zokuqala komfantu kamuva ngesikhathi sokusebenza. Izixhumi ezinamabhawodi kufanele ziqiniswe nge-torque ecacisiwe yomenzi kusetshenziswa izikali ze-torque ezilinganisiwe, futhi amanani e-torque angadinga ukulungiswa ukuze kubhekwe ukuncipha kwe-coefficient yokungqubuzana nokufinyela okushisayo kwezinto zokuqinisa emazingeni okushisa aphansi. Izixhumi ezinemicu (threaded connections) kufanele zigcotshwe ngezinto zokugcoba eziklelwe emazingeni okushisa aphansi (low-temperature-rated anti-seize compounds) ezihlala zisebenza emazingeni okushisa angaphansi kweqanda, ngoba izinto zokugcoba ezijwayelekile zingajiya, zibe yiqhwa, noma zome, okuholela ekugqweleni, ekubambeni, noma ekungacindezeli kahle kwesivalo. Ukuqondana kwamapayipi kubaluleke kakhulu ezindaweni ezibandayo, ngoba ukungaqondani kudala izingcindezi zokugoba ezihlangana nezingcindezi zokufinyela okushisayo futhi kungadlula amandla e-yield yezinto, okubangela ukuguquka kwesimo noma ukuphuka lapho kuxhunywa khona. Wonke umsebenzi wokufaka kufanele wenziwe ngamachwephesha aqeqeshiwe alandela imiyalelo yomenzi futhi asebenzise imishini yokuzivikela efanele, futhi kufanele kugcinwe irekhodi elinemininingwane lokufaka kusixhumi ngasinye ukuze kusekelwe ukuhlolwa nokuhlela kokunakekela esikhathini esizayo.

Uma se ifakiwe, amapayipi asebenza endaweni ebandayo adinga uhlelo lokunakekela olusebenzayo oluhlanganisa ukuhlolwa okuvamile ngamehlo, ukuhlola ama-torque, ukuhlola ukuvuza, kanye nokuhlolwa okungonakalisi okuvamile ukuze kutholakale izimpawu zokuqala zokuqhekeka, ukugqwala, noma ukuwohloka kwezinto ngaphambi kokuba kube yizinkinga ezinkulu. Ukushintshashintsha kwezinga lokushisa kungenye yezinsongo ezinkulu zesikhathi eside ekuqineni kokuxhumana, ngoba ukushintshashintsha kwezinga lokushisa phakathi kwehlobo nobusika kubangela ukunwebeka nokufinyela okuphindaphindwayo okungaholela ekuqhekekeni ngenxa yokukhathala, ikakhulukazi emakhoneni abukhali, ezimpandeni zezintambo, nakwezinye izindawo ezigcizelela kakhulu. Abasebenzi kufanele banake kakhulu izixhumanisi ezithola izinguquko ezisheshayo zokushisa, njengalezo eziseduze namapayipi angaphezulu komhlaba angavaliwe, iziteshi zamavalvu, noma imishini ecubungulwayo evame ukushiswa nepholwa. Ukugcoba nokunakekela ukuvala nakho kubalulekile, ngoba ama-gasket nama-O-ring angaqina futhi alahlekelwe ukunwebeka kwawo emazingeni okushisa aphansi, okungaholela ekuvuzeni, futhi okokugcoba kungonakala noma kugezwe, kukhuphule ukungqubuzana nokugqoka kwezingxenye ezinyakazayo. Uma isixhumanisi kufanele sishintshwe endaweni ebandayo, isixhumanisi esisha kufanele sifudunyezwe sibe seduze nezinga lokushisa legumbi ngaphambi kokufakwa, izindawo ezihlangana kufanele zihlanzwe futhi zihlolwe ukuthi azonakalanga, futhi izisekelo zamapayipi ezizungezile kufanele zihlolwe ukuze kuqinisekiswe ukuthi zihlinzeka ngokuqondana okufanele nokukhulula ingcindezi. Ngokulandela lezi zinqubo ezinhle zokufaka nokunakekela, abaqhubi bamapayipi bangakwazi ukwelula kakhulu isikhathi sokusebenza kwezixhumanisi zabo futhi banciphise imvamisa yokulungiswa okuphuthumayo okubizayo phakathi nezinyanga ezinzima zasebusika.

Okuhlangenwe nakho kwangempela okuvela kubaqhubi bamapayipi ezindaweni eziphakeme ngezinga lokushisa kunikeza ubufakazi obuqinile bokubaluleka kokukhetha izinto zokuxhuma ezimelana nokuphuka kanye nokuqalisa izinqubo ezifanele zokufaka nokunakekela ezindaweni ezinomoya obandayo. Isibonelo esiphawulekayo sihlanganisa umsebenzi wezimayini enyakatho yeCanada owabhekana nokwehluleka okuphindaphindiwe kokuxhuma epayipini layo lokuthutha udaka olugxilile, nokuphuka okwenzeka emazingeni okushisa angaphansi kuka-minus thirty-five degrees Celsius ngezinyanga zobusika. Uphenyo lwembula ukuthi izixhumanisi zokuqala zazakhiwe ngensimbi evamile yekhabhoni enezinga lokushisa lokuguquka lisuka ekuvumelaneni liye ekuphukeni eliphezulu kakhulu kunezinga lokushisa lokusebenza, futhi ukwehluleka kwakwengezwa ukusetshenziswa okungafanele kwe-torque okwethula umfutho owedlulele ezixhumanisweni ezinemicu. Ngemva kokubonisana neVaricpand International, imayini yathatha indawo yazo zonke izixhumanisi ezibalulekile ngama-camlock couplings ensimbi engagqwali ayeqinisekiswe ngokukhethekile ukusebenza emazingeni okushisa aphansi, futhi baphinde bashintsha izinqubo zabo zokufaka ukuze bahlanganise ukuqinisekiswa kwe-torque kanye nezinqubo zokuthambisa emazingeni okushisa aphansi. Umphumela waba ukuqedwa ngokuphelele kokwehluleka kokuxhuma ngenxa yokuphuka ezinkathini ezimbili ezilandelanayo zobusika, naphezu kweqiniso lokuthi amazinga okushisa ahlala engaphansi kuka-minus thirty degrees Celsius amasonto amaningi ngokulandelana, okumelela ukuthuthuka okukhulu ekuthembekeni kokusebenza kanye nokuncishiswa okukhulu kwezindleko zokunakekela.

Enye indaba eyisibonelo ivela kunethiwekhi yokusabalalisa amanzi kamasipala eScandinavia, lapho izixhumanisi zensimbi ezindala emapayipini angaphansi komhlaba bezihlangabezana nokuvuza nokuqhekeka ngenxa yemiphumela ehlangene yamazinga okushisa abandayo nokunyakaza komhlaba okubangelwa ukuphakama komhlaba ngenxa yeqhwa. Inkampani yezinsiza yakhetha izixhumanisi ze-aluminum camlock zikaVaricpand ngohlelo lokushintsha oluhlolwayo engxenyeni eyinkinga kakhulu yenethiwekhi, ihehwe ukuqina kwe-aluminum alloy emazingeni okushisa aphansi okuqinisekisiwe, ukumelana nokugqwala ezimweni ezinamandla zomhlaba namanzi angaphansi komhlaba, kanye nesisindo sayo esilula, okwenza kube lula ukufakwa ngabasebenzi abasebenza emisele emincane. Uhlelo lokuhlola lwaba yimpumelelo kangangokuba inkampani yezinsiza yandisa ukusetshenziswa kwalezi zixhumanisi kwezinye izingxenye zenethiwekhi, futhi ukuhlolwa okwalandela kanye nokuhlolwa kwengcindezi okwenziwa ngemva kobusika bokuqala akuzange kubonise zimpawu zokuqhekeka, ukuvuza, noma ukuwohloka kwezinto. Lezi zifundo ziyabonisa ukuthi ukukhetha kwezinto zokuxhumanisa ezingaqhekeki akusiyona into yezemfundo kodwa isinqumo esisebenzayo esinemiphumela elinganisekayo yezezimali nokuphepha, futhi zigqamisa ukubaluleka kokusebenzisana nomhlinzeki onjengoVaricpand International onobuchwepheshe obujulile bokuncoma izixazululo ezifanele. Ulwazi olwengeziwe ngalawa nangezinye izinhlelo zokusebenza eziyimpumelelo lungatholakala ku-Izindaba ikhasi lewebhusayithi yenkampani, elishicilela njalo izifinyezo zamaphrojekthi kanye nezibuyekezo zobuchwepheshe.

Ukuqinisekisa ubuqotho bamapayipi ezindaweni ezibandayo kudinga indlela ebanzi nengqondo lapho kukhethwa izinto zokuxhuma, ukufakwa, nokunakekelwa, kanti izinto zokuxhuma ezingaphuki kalula zisebenza njengomgoqo wokuqala wokuvikela ukuphuka okuyinhlekelele emazingeni okushisa angaphansi kweqanda. Lesi sihloko sihlole isayensi eyisisekelo yokuphuka kwezinto, izici ezibalulekile ezinomthelela ekukhetheni izinto, izixazululo ezikhethekileyo ezinikezwa yi-Varicpand International, kanye nezinqubo ezinhle ezilawula ukufakwa okufanele nokunakekelwa okuqhubekayo ezindaweni ezibandayo kakhulu. Umlayezo oyinhloko ukuthi onjiniyela nabaphathi bamaphrojekthi abakwazi ukuthembela ekuqageleni noma ekucacisweni okujwayelekile kwemikhiqizo lapho becacisa izinto zokuxhuma zamapayipi ezindaweni ezibandayo; kunalokho, kumele bafune idatha yokuhlolwa komthelela wokushisa okuphansi eqinisekisiwe, baqonde izici zokushintsha kusuka ekuqinileni kuye ekuphukeni kwezinto ezikhethiwe, futhi basebenzisane nabahlinzeki abanolwazi nobubanzi bemikhiqizo ukuze banikeze izixazululo ezifanele inhloso. I-Varicpand International ikhombisile ikhono layo lokuhlangabezana nalezi zidingo eziyinselele ngohlu lwayo olubanzi lwemikhiqizo, ukulawulwa kwekhwalithi okuqinile, nokusekelwa kwezobuchwepheshe okuphendulayo, okwenza kube uzakwethu obalulekile wamaphrojekthi amapayipi ezindaweni ezineqhwa, ngaphansi kweqhwa, nasezindaweni eziphakeme. Ngokutshala imali ezintweni zokuxhuma ezingaphuki kalulu nokulandela izinqubo zokufaka nokunakekela ezichazwe kulesi sihloko, abaqhubi bamapayipi banganciphisa kakhulu ubungozi bokuphuka okubizayo nokuyingozi, bandise isikhathi sokusebenza kwempahla yabo, futhi baqinisekise ukusebenza okuqhubekayo nokuphephile kuzo zonke izimo zasebusika ezinzima. Ukuze uthole eminye imininingwane ngemikhiqizo namakhono e-Varicpand International, noma uxoxe ngohlelo oluthile lokusebenza ezindaweni ezibandayo nethimba labo lobunjiniyela, sicela uvakashele i-Xhumana ikhasi ukuthumela umbuzo futhi uthole usizo olusheshayo, nolwazi olunolwazi.

Inhlangano yezomnotho yokubeka phambili ukukhethwa kwezinto zokuxhuma (coupling materials) kumaphrojekthi amapayipi ezindaweni ezibandayo iyakhanga, ngoba izindleko zokwehluleka okukodwa kwe-coupling ephukayo (brittle coupling) zingaba phezulu kakhulu kunezindleko ezengeziwe zokucacisa into yekhwalithi ephezulu evikela ukuphuka (anti-brittleness coupling material). Ukwehluleka kungaholela ekumisweni komsebenzi, ukulahlekelwa komkhiqizo, izindleko zokuhlanza imvelo, izinhlawulo zokulawula, kanye nomonakalo esithunzini senhlangano, kungasaphathwa nokuthi kungenzeka ukulimala kwabasebenzi noma ukufa kwabo. Ngakho-ke, isinqumo sokukhetha izinto zokuxhuma eziqinisekisiwe, ezikwazi ukusebenza emazingeni okushisa aphansi, kufanele sibhekwe njengomshwalense wokuvikela ingozi enkulu kunokuba kube nje into yezindleko kwisabelomali sokuthenga. Ngaphezu kwalokho, ngokusebenzisana nomkhiqizi onjenge-Varicpand International ogcina uhlu oluhlukahlukene lwezinhlobo ze-coupling nezinto zokwakha, abaqhubi bamapayipi bangakwazi ukwenza ukukhethwa kwe-coupling kube okufanayo kumaphrojekthi amaningi, benze lula ukuphathwa kwezingxenye eziyisipele, futhi bazuze ngamanani amahle ngokuthenga ngobuningi. Ukuzibophezela kwenkampani ekuthuthukiseni okuqhubekayo, okubonakala ngokutshalwa kwezimali okuqhubekayo emandleni okuhlola nokuthuthukiswa kwemikhiqizo emisha, kuqinisekisa ukuthi amakhasimende azo azokwazi ukufinyelela kubuchwepheshe be-coupling obusha obuhlangabezana nezidingo eziguqukayo zemisebenzi yezindawo ezibandayo. Njengoba umsebenzi wezimboni womhlaba wonke uqhubeka ukhula uya ezindaweni ezikude nezibandayo, ukubaluleka kwezixazululo ze-anti-brittleness coupling ezithembekile kuzokhula kuphela, futhi izinhlangano ezibheka phambili zizozimisa ukuze ziphumelele ngokwakha ubudlelwano bokuthenga nabahlinzeki ababeka phambili ikhwalithi, ukuphepha, nobuchwepheshe obuhle. Ngenhlanganisela yobubanzi bemikhiqizo, ubuchwepheshe bobunjiniyela, nesevisi egxile kumakhasimende, i-Varicpand International ikulungele ukuba yilowo mlingani othembekile wabaqhubi bamapayipi emhlabeni wonke, futhi abafundi abanentshisekelo bangaqala ukusebenzelana nayo ngokuhlola ikhathalogi enkulu yemikhiqizo ku-Ikhaya ikhasi.

I-anti-brittleness coupling iyingxenye yokuxhuma amapayipi ekhiqizwa ngezinto ezigcina ubuthambile nobulukhuni bazo emazingeni okushisa aphansi, ivikela ukuphuka okungazelelwe nokuyinhlekelele ezinhlelweni zamapayipi ezindaweni ezibandayo. Lawa ma-coupling abalulekile ngoba izinto ezijwayelekile zama-coupling zingase zishintshe zibe buthaka emazingeni okushisa angaphansi kweqanda, zibangele ukuphuka ngaphandle kwesixwayiso futhi zikhiphe okuqukethwe epayipini. Izindleko zokwehluleka okunjalo, okuhlanganisa isikhathi sokuma komsebenzi, ukulungisa, umonakalo wemvelo, nezingozi zokuphepha, zidlula kakhulu inani elikhokhiswayo lokucacisa izinto ze-anti-brittleness ezihlolwe kahle.

Izinsimbi ze-Austenitic stainless steel ezifana namabanga 304 no-316 zibhekwa kabanzi njengezinto ezihamba phambili zokuxhuma emazingeni okushisa aphansi kakhulu ngoba ukwakheka kwazo kwe-face-centered cubic kugcina ukuqina noma ngabe kumazinga okushisa aphansi kakhulu. Ama-aluminium alloys kuhlelo lwe-6000 nawo anikeza ukusebenza okuhle kakhulu emazingeni okushisa aphansi ngesisindo esilula, kuyilapho ithusi nobrashi kunikeza ukuqina okumaphakathi nokumelana nokugqwala okuhle. Kuhlala kubalulekile ukuqinisekisa idatha yangempela yokuhlolwa komthelela ezingeni lokushisa elihlosiwe lokusebenza kunokuthembela kuphela ezincazelweni ezijwayelekile zento.

Izinga lokushisa eliphansi lehlisa amandla okushisa ku-lattice yensimbi, okunciphisa ukunyakaza kwama-dislocation futhi kwenza ukuguquka kwesimo kube nzima, okwenza into ibe lukhuni futhi isengozini yokuphuka okuncipha. Njengoba izinga lokushisa lehla, amandla into okumunca amandla omthelela ayancipha, futhi lapho izinga lokushisa lidlula izinga lokushisa lokuguquka kusuka ekuguqukeni kuye ekuphukeni, indlela yokuphuka ishintsha isuke ekuqhekekeni okuguqukayo iye ekuqhekekeni okusheshayo okucwebezelayo. Yingakho izinto kufanele zihlolwe emazingeni okushisa okusebenza ngempela, hhayi nje ezingeni lokushisa legumbi, ukuze kuqinisekiswe ukuthi zifanele ukusetshenziswa kumapayipi asemazingeni okushisa aphansi.

Izinga lokushintsha kusuka ekuguquguqukeni kuye ekuqhekekeni (DBTT) izinga lokushisa elingaphansi kwalo into ephukayo iqhekeke ngendlela yokuqhekeka esikhundleni sokuguquguquka ngokomzimba, futhi liyipharamitha ebalulekile yokukhetha izinto zokuhlanganisa ezisebenzela emazingeni okushisa aphansi. Ngokuvamile linqunywa kusetshenziswa ukuhlolwa kwe-Charpy V-notch impact test, olukala amandla amuncwa yisampula enesikwele lapho ishaywa i-pendulum ejikelezayo ezingeni lokushisa elilawulwayo. Izinto ezine-DBTT ephansi kakhulu kunezinga lokushisa elincane elilindelekile lokusebenza ziyathandwa ngoba zinikeza umkhawulo wokuphepha ekwehlulekeni ukuqhekeka.

Yebo, izinsimbi zokuxhuma ze-stainless, ikakhulukazi izinhlobo ze-austenitic ezifana ne-304 ne-316, zinconzo ngokuqondile ukuthi zisetshenziselwe amakhaza amakhulu ngoba zigcina amandla okumelana nokushaywa nokuguquguquka emazingeni okushisa angaphansi kakhulu kuka-minus amashumi amane degrees Celsius. I-Varicpand International inikeza Ukuxhuma kwe-Stainless Steel Camlock imikhiqizo ekhiqizwa ngezinto eziqinisekisiwe futhi ingaphansi kokulawulwa kwekhwalithi okuqinile ukuze kuqinisekiswe ukusebenza okuthembekile emazingeni okushisa aphansi. Nokho, kusabalulekile ukuqinisekisa ukuthi inombolo yokushisa ethile kanye nombiko wokuhlolwa kwesigayo kuhlanganisa izinga lokushisa eliphansi elihlosiwe.

Ama-couplings e-aluminium angaphepha ezimweni eziqandayo uma kukhethwa i-alloy efanele, ngoba i-aluminium ngokuvamile ayibonisi ukushintsha kwe-ductile-to-brittle ngendlela efanayo nensimbi ethile, futhi ngempela ithambekele ekuqineni emazingeni okushisa aphansi. Ama-alloys ochungechungeni lwe-6000, avame ukusetshenziswa kuma-couplings ezimbonini, agcina ukuqina okuhle kuze kube emazingeni okushisa aphansi kakhulu, okwenza afanelekele izimo eziningi zezimo ezibandayo. Nokho, ama-alloys athile e-aluminium anokuqukethwe okuphezulu kwe-copper noma i-magnesium angase abe sengozini yokuqhekeka kwe-stress corrosion noma ukuncipha kokuqina, ngakho idatha eqinisekisiwe yomthelela ibalulekile.

Izindlela ezibalulekile zokufaka zihlanganisa ukugcina ama-couplings ezimweni ezishisayo ngaphambi kokufakwa, ukugwema ukushaya noma amandla amaningi angaletha imifantu emincane, ukusebenzisa ama-lubricants aklelwe ukushisa okuphansi kanye nama-anti-seize compounds, kanye nokuqinisekisa ukuqondana kahle kwamapayipi ukuze kugwenywe ukugoba okucindezelayo. Amabhodi kufanele aqiniswe nge-torque ecaciswe umkhiqizi kusetshenziswa imishini elinganisiwe, futhi ama-gaskets kufanele ahlolwe ukuqina ngenxa yokushisa okubandayo ngaphambi kokuhlanganiswa. Zonke lezi zindlela zigcina ukuqina kwangaphakathi kwento futhi zivimbela ukwethulwa kwezinto ezingadala ukuphuka okungazelelwe.

I-Varicpand International iqinisekisa ikhwalithi ngokuthola izinto zokusetshenziswa eziqinisekisiwe emikhiqizweni ehloniphekile, yenza ukuhlolwa kobukhulu kanye nokuhlolwa kwengcindezi kuma-couplings aseqediwe, futhi inikeze amakhasimende imibhalo ephelele yokulandeleka kwezinto. Inkampani inikeza imikhiqizo ngezinto ezikhethwe ngokukhethekile futhi ezihloliwe ukuze zisebenze emazingeni okushisa aphansi, ngamandla okuhlinzeka ngemibiko yokuhlolwa komthelela kanye nezimemezelo zokuthobela imithetho ukuze kutholakale ukugunyazwa okusemthethweni. Le ndlela eqinile yokulawula ikhwalithi yenzelwe ukunikeza abaqhubi bamapayipi ukuzethemba ekuthembekeni kwama-couplings abo ezimweni ezinzima kakhulu zokusebenza.

Ama-couplings ekusebenzeni kwesimo sezulu esibandayo kufanele ahlolwe ngamehlo okungenani kanye ngenyanga phakathi nezinyanga zobusika, futhi kwenziwe ukuhlola okuvamisile ngemva kokushisa okukhulu, ukushintsha kwezinga lokushisa ngokushesha, noma izehlakalo zokunyakaza komhlaba. Ukuhlola kwe-torque kanye nokuhlola ukuvuza kufanele kwenziwe okungenani kanye ngekota, kanti ukuhlola okuphelele okungonakalisi okufana ne-ultrasonic noma ukuhlola kwe-magnetic particle kunconywa ukuba kwenziwe kanye ngonyaka noma ngokohlelo lokulawula ubunjiniyela bomnikazi wepayipi. Ukuhlola ngokushesha ngemva kwanoma yimuphi umcimbi obalulekile wezinga lokushisa noma umthwalo kubalulekile ukuze kutholakale izimpawu zokuqala zokuqhekeka ngaphambi kokuthi kwenzeke ukwehluleka.

Ukuze uthole isiqondiso esinemininingwane mayelana nokukhetha izixhumanisi ezingaphukiyo, ungathintana nethimba lokusekela lobunjiniyela e-Varicpand International nge-Ukuthintana ikhasi, lapho ungathumela khona ulwazi mayelana nezimo zokusebenza zepayipi lakho, imidiya, nezidingo zokushisa. Inkampani inganikeza izincomo zezinto zokwakha, amashidi edatha yobuchwepheshe, nokusekelwa kokusebenzisa ukukusiza ukhethe isixhumanisi esifanele kakhulu iphrojekthi yakho yendawo ebanda. Ungabuye ubuke uhla olugcwele lomkhiqizo ku-Imikhiqizo ikhasi futhi ubuke izindatshana zobuchwepheshe ezishicilelwe esigabeni sabo Sezindaba ukuze uthole imininingwane eyengeziwe.