Ukusebenza kwamapayipi ezindaweni ezibandayo kulethela izinselelo ezihlukile zobunjiniyela ezidinga ukuhlela ngokucophelela kanye nobuchwepheshe bezinto zokwakha. Lapho amazinga okushisa ehla kakhulu ngaphansi kweqhwa, izixhumanisi zamapayipi ziba phakathi kwezingxenye ezisengozini kakhulu ohlelweni lonke, ngoba kumele zimunce ingcindezi yemishini ngenkathi zimelana nokuqhekeka okubangelwa ukubanda okukhulu. Ukukhetha izinto zokuxhumanisa ezingaqhekeki akusiyona nje intandokazi yobuchwepheshe kodwa isinqumo esibalulekile sokusebenza esingasho umehluko phakathi kwenkonzo ethembekile nokwehluleka okuyinhlekelele. Lo mhlahlandlela wenzelwe ukusiza abaqhubi bamapayipi, onjiniyela bokunakekela, kanye nochwepheshe bokuthenga ukuthi baqonde indlela yokuhlola nokukhetha izixhumanisi ezizosebenza ngokuphephile ezindaweni ezinobusika obunzima. Ngokuhlola isayensi yokuqhekeka, izindlela ezibalulekile zokukhetha, kanye nezinto ezifakazelwe, sihlose ukunikeza ulwazi olusebenzisekayo oluvikela ingqalasizinda kanye nabasebenzi. Kulo lonke leli athikili, sizogqamisa nokuthi i-Varicpand International isebenzisa kanjani ubunjiniyela obuthuthukile nokuhlolwa okuqinile ukukhiqiza izixhumanisi ezakhelwe izimo ezibandayo kakhulu emhlabeni. Noma ngabe uphethe imigqa yamanzi kamasipala, amapayipi ezimboni, noma ukufakwa kwezindawo ezikude, lolu lwazi luzokusiza wenze izinqumo ezinolwazi nokuzethemba.

amazing temperature zishintsha ukusebenza kwezinto eziyisisekelo zensimbi namapholima, okwenza izinto ezivame ukuqina futhi zithambeke zibe buthakathaka ngokuzumayo futhi zithambekele ekuqhekekeni. Lo mkhuba ubhalwe kahle ezimbonini ezahlukahlukene kusukela kwezikawoyela negesi kuya kwezamanzi, lapho ukwehluleka kokuxhuma okuhlobene nobusika kuvame ukuholela ekulahlekelweni kwesikhathi okubizayo, ukulahlekelwa komkhiqizo, nezingozi zokuphepha. Umthelela wezomnotho wokwehluleka okunjalo udlula kakhulu intengo yezingxenye zokushintsha, uhlanganisa abasebenzi baphuthumayo, ukulungiswa kwemvelo, kanye nokulahlekelwa kwamandla okukhiqiza. Ngenxa yalokho, abasebenzisi ezifundeni zase-Arctic, subarctic, nasezindaweni eziphakeme kumele basebenzise indlela esebenzayo ebeka phambili ukuqina kwamazinga okushisa aphansi kusukela ekuqaleni komjikelezo wokuthenga. Lesi sihloko sisebenza njengereferensi ebanzi kunoma ngubani onomsebenzi wokugcina ubuqotho bamapayipi ngezikhathi ezinde zokubanda. Sizobheka izimbangela eziyisisekelo zobuthakathaka, izici zokusebenza ezibalulekile okumele zihlolwe, kanye nezinto ezithile ezingamelana nokuqhekeka ezimweni eziqandayo. Ekugcineni, uzoba nohlaka olucacile lokukhetha ukuxhuma okufanele kanye nomlingani othembekile ku-Ikhaya ukusekela izinhloso zakho zokusebenza.

Ukuqina ezindaweni ezibandayo kulawulwa inqubo ye-metallurgical eqondakala kahle eyaziwa ngokuthi ukuguquka kusuka ekuqineni kuye ekuqhekekeni (ductile-to-brittle transition), okwenzeka lapho izinga lokushisa lezinto zehla ngezansi komkhawulo obalulekile owaziwa ngokuthi izinga lokushisa lokuguquka kusuka ekuqineni kuye ekuqhekekeni (DBTT). Ngenhla kwalomkhawulo, izinsimbi ziyaguquka ngokomzimba futhi zimunce amandla ngaphambi kokuba ziqhekeke, yingakho zikwazi ukumelana nokushaywa, ukugoba, nokushintshashintsha kwengcindezi ngaphandle kokwehluleka. Nokho, njengoba izinga lokushisa lehla, i-atomic lattice iba nokunyakaza okuncane, futhi ukunyakaza kwe-dislocation kuyavinjelwa, okubangela ukuthi into ilahlekelwe ikhono layo lokuvumela ngaphambi kokuba iqhekeke. Umphumela wukugqabhuka okungazelelwe, okuvame ukuba yinhlekelele, okusakazeka ngokushesha emngceleni wezinhlamvu noma ngaphakathi kwezinto ezifakiwe, kushiye isixwayiso esincane noma singabonakali nhlobo sokwehluleka okuzayo. Lokhu kuguquka kuvelela kakhulu ezinsimbini zekhabhoni ezinokuningi kwekhabhoni, kwezinye izinsimbi zensimbi (cast irons), nasezintweni ezithile zepholima, konke okuvamile ezingxenyeni zamapayipi. Ezingxenyeni zokuxhuma amapayipi, lokhu kusho ukuthi ingxenye esebenza kahle kakhulu ezindaweni ezinemvumelwano yezulu ingaqhekeka ngomzuzu wokuqala ukushaywa ngesikhathi sokubanda kukaJanuwari. Ukuqonda lokhu kuguquka kubalulekile ngoba kuqondisa ngqo amazinga ezinto kanye nezinqubo zokukhiqiza okufanele zicaciswe ezinhlelweni zokuxhuma ezimelana nokuqhekeka (anti-brittleness coupling applications).

Imiphumela ebonakalayo yokuqina kokushisa okubandayo iveza izindlela eziningi ezaziwayo zokwehluleka okufanele abasebenzi bazibone njengezimpawu eziyingozi. Okuvame kakhulu ukuphuka okunzima, lapho i-coupling iqhekeka ngokuzumayo ngaphansi komthwalo omile noma wokushaya, ngokuvamile iqala ezindaweni ezigcizelela kakhulu njengezimpande zentambo, ama-keyway, noma amakhona angaphakathi abukhali. Okunye ukwehluleka okuvamisile ukwakheka kokuphuka okubandayo ngesikhathi sokufakwa, lapho izinsimbi ziqiniswa noma zishaywa emazingeni okushisa angaphansi kweqanda, okudala izingcindezi ezeqisa ukuqina kokwephuka okunciphile kwento. Ukuvuza ekuhlanganeni kwangaphakathi nakho kuvamile, njengoba imifantu emincane isakazeka ngokwendilinga futhi ivumele uketshezi olucindezelwe ukuba luphume, okuholela ekubandeni, ukugqwala, nokonakala okwengeziwe kwepayipi elizungezile. Kumakhaphingi e-polymer, ukuqina kokushisa okuphansi kubonakala njengokuqhekeka kwangaphezulu, ukukhipha umsizi, nokulahlekelwa ukunwebeka, okunciphisa amandla okuvala futhi kuvumele ukuhlukana kokuhlanganisa ngaphansi kokufinyela kokushisa. Ngayinye yalezi zindlela zokwehluleka ingakhula ngokushesha, ikakhulukazi ezikhungweni ezikude lapho izisebenzi zokulungisa zibhekana nezimo eziyingozi zokuhamba kanye nokufinyelela okulinganiselwe kwemishini ekhethekile. Ngakho-ke kubalulekile ukuthi izeluleko zamapayipi asemakhaya abandayo zihlale zifaka ukuhlolwa okuphelele kokumelana nomthelela nokuqina ngaphambi kokucacisa noma iyiphi ingxenye ye-coupling. Abasebenzi abaziba lezi zimpawu eziyisexwayiso bavame ukukhokhela ukunganaki kwabo ngokuma okunwetshiwe kanye nezingozi eziphakeme zokuphepha ebezingagwenywa ngokukhetha okufanele kwento.

Ukumelana nomthelela kungukuthi kuyisici esibaluleke kakhulu emishinini yamapayipi (pipeline couplings) esebenza ezindaweni ezinamakhaza, ngoba kukala ukuthi into ingamunca amandla amangaki ngaphambi kokuba iphuke uma icindezelwa kungazelelwe. Izilinganiso ezifana ne-Charpy V-notch kanye ne-Izod impact tests zivame ukusetshenziswa ukukala lesi sici emazingeni okushisa ahlukahlukene, okuvumela onjiniyela ukuba baqhathanise izinto ngokufanele ezimweni ezahlukene zokusebenza. I-coupling enokumelana nomthelela okuphezulu ngokuvamile idlula ama-joule angu-27 ezingeni lokushisa elincane eliklanyelwe, kanti izinto eziphukayo zingehla zibe seduze kukiro uma kucatshangwa ibanga elincane lokushisa. Ukuqina (toughness), nakuba kuhlobene, kubuye kubheke ikhono lezinto lokumelana nokusakazeka kokuqhekeka uma sekukhona ukulimala, okwenza kube isilinganiso esiphelele sokuqina kwesakhiwo ezimweni zangempela ezinokukhubazeka. Lezi zici ndawonye zinquma ukuthi i-coupling ingakwazi yini ukumelana nokushaqeka kwemishini, ukudlidliza, kanye nokucindezela kokufinyela ngenxa yokushisa, okuyizinto ezingenakugwenywa ekusebenzeni ezindaweni ezibandayo. Lapho kuhlolwa abahlinzeki, abaqhubi kufanele bacele idatha yokuhlolwa komthelela eqinisekisiwe ezingeni lokushisa labo elithile, kunokuba bathembele ezilinganisweni zasekamelweni ezingadukisa. Leli zinga lokuhlola liqinisekisa ukuthi i-anti-brittleness coupling ekhethiwe izosebenza ngendlela ebikezelwayo noma ngisho nasezikhathini ezinzima kakhulu ze-polar vortex.

Ukukhetha i-coupling efanele yokusebenza kwepayipi ezimweni ezibandayo kudinga ukuhlolwa okuhlelekile kwezinto ezihlobene ezimbalwa, kuqalwe ngezinga lokushisa elibekiwe kanye nazo zonke izimo zokusebenza umkhiqizo ozohlangabezana nazo. Izinga lokushisa eliphansi le-ambient, izinga lokushisa loketshezi oludluliswayo, kanye namathuba okushintshashintsha kokushisa ngokushesha kufanele konke kubhalwe phansi futhi kuqhathaniswe nezinga eliqinisekisiwe lokusebenza ekushiseni okuphansi kwento esetshenziswayo. Abasebenzisi kufanele futhi bacabangele ukutholakala komoya obandayo, umthwalo weqhwa, kanye nokuchayeka emakhemikhali okuncibilikisa iqhwa, konke okungasheshisa ukuwohloka kwengaphezulu futhi kunciphise impilo yokusebenza ye-coupling. Ngaphezu kwalokho, umfutho wokusebenza, imvamisa yokukhuphuka komfutho, kanye namathuba emiphumela ye-water hammer konke kubeka izidingo zemishini okufanele zilinganiswe namandla nokuqina kwento esetshenziswayo. Kubalulekile futhi ukucabangela indawo yokufaka, okuhlanganisa nokuthi abasebenzi bazohlanganisa ama-couplings endaweni yokusebenza noma eshabhu elishisayo ngaphambi kokuthutha. Ngayinye yalezi zinto eziguquguqukayo inomthelela ekukhetheni kokugcina kwento, futhi ukunganaki nokukodwa kungonakalisa lonke uhlelo. Inqubo ephelele yokukhetha iphatha i-coupling njengengxenye eyakhiwe ngobunjiniyela kunokuba ibe yifitingi evamile, okuyiyona kanye filosofi eyamukelwa abakhiqizi abaholwa ubunjiniyela abafanaMayelana Nathi lapho bethuthukisa imikhiqizo yabo.

Izinto zokuhlanganisa kufanele zihambisane ngamakhemikhali nangemishini nephayipi elihlanganiswayo, noma ngabe lelo phayipi liyinsimbi yekhabhoni, insimbi engagqwali, insimbi eqinile, i-PVC, i-HDPE, noma ipulasitiki eqiniswe ngengilazi. Izinsimbi ezihlukene ezithintana zingadala ukugqwala kwe-galvanic, okusheshiswa ubukhona bomswakamo nosawoti wokuncibilikisa iqhwa ovame ukutholakala ezindaweni ezibandayo. Ama-coefficients okunwebeka ngokushisa nawo ayahluka phakathi kwezinto, futhi isihlanganisi esinwebeka ngezinga elihlukile kunephayipi singalahlekelwa ukuqina kwaso kokuvimba amanzi ngesikhathi sokushintsha kwezinga lokushisa elidlulele. Emapayipini epulasitiki, amandla okucindezela esihlanganisi kufanele alawulwe ngokucophelela ukuze kugwenywe ukugeleza okubandayo noma ukuguquka kwe-deformation kwento ethambile yephayipi, kuyilapho emapayipini ensimbi, isihlanganisi kufanele sihambele ukukhathala okuphindaphindayo ngaphandle kokwakha imifantu yokucindezeleka. Ukudambisa ukudlidliza, ukuhlukanisa ugesi, nokuhambisana nezinhlelo zokuvikela i-cathodic kuyizinto ezengeziwe okufanele zicatshangelwe ezingathonya ukukhethwa kwezinto ezinhlelweni ezikhethekile. Abasebenzisi kufanele bahlale bebheka amashidi edatha yomkhiqizi, futhi uma bengabaza, bacele isiqondiso konjiniyela bezicelo abaqonda ubunkimbinkimbi bohlelo ngalunye lwamapayipi. Ngokubhekana nokuhambisana kusenesikhathi, kungenzeka ukugwema ukwehluleka kwangaphambi kwesikhathi okuvela ekungahambisaneni kwezinto ezimweni ezinzima zokusebenza.

Ngisho noma i-coupling eningi kakhulu yokumelana nokuphuka ingahluleka uma ifakwe ngendlela engafanele, futhi ukufakwa ngesikhathi sezulu esibandayo kuletha izinselelo ezithile okumelwe zibikezelwe ngesikhathi sokuklama. Emazingeni okushisa angaphansi kweqanda, ama-seal nama-gasket aba lukhuni futhi angadabuka ngesikhathi sokuhlanganisa, ngakho ama-coupling aklanyelwe ukusebenza e-Arctic avame ukuba nama-elastomer akhethekile agcina ukuguquguquka emazingeni okushisa aphansi. Ukucaciswa kwe-torque kungadinga ukulungiswa emazingeni okushisa aphansi, njengoba ama-coefficient okungqubuzana eshintsha futhi ukufinyela kokushisa kuguqula izikhala zentambo, futhi abasebenzi kufanele baqeqeshwe ukuthi balandele izinqubo zomkhiqizi ezicabangela le miphumela. Kuyelulekwa futhi ukuhlela ukushisisa kwezingxenye ezindaweni ezilawulwayo lapho kungenzeka, ikakhulukazi kuma-coupling anobubanzi obukhulu lapho amandla okuhlanganisa ensimini emakhulu. Uma sezifakiwe, ukuhlolwa njalo kwezimpawu zokuphuka, okuhlanganisa imifantu engaphezulu, ukuguquka kwesimo, nokuvuza kwe-seal, kubalulekile ukuze kutholakale ukuwohloka ngaphambi kokuba kuholele ekwehlulekeni okuphelele. Izinhlelo zokugcina ezivimbelayo kufanele zihlanganise ukubuyekezwa kwe-torque okuhleliwe, ngoba ukushintshashintsha kokushisa kungaxegisa noma kukhulule ukuxhumana ngokuhamba kwesikhathi, futhi ukubhalwa kwalo lonke uhlelo lokuhlola kusiza ukwakha umlando wokusebenza. I-coupling efakwe kahle futhi igcinwe kahle ngokuvamile izohlala isikhathi eside kunepayipi elizungezile, inikeze imbuyiselo ephezulu kwezimali kanye nezindleko eziphansi zomjikelezo wokuphila.

Imikhiqizo eminingi yezinto ezisetshenziswayo ikhombisile ikhono layo lokuletha ukusebenza okuthembekile kokumelana nokuphuka emapayipini asendaweni ebandayo, ngayinye inezinzuzo ezihlukile kanye nokushintshana okufanele kucatshangwe ngokucophelela. Izinsimbi zekhabhoni ezingeni lokushisa eliphansi ziphakathi kwezinketho ezivame kakhulu, nezigaba ezinjenge-ASTM A333 ne-A350 ezinikeza amanani we-Charpy impact aqinisekisiwe kuze kufike ku- -50°C noma ngaphansi uma zelashwe ngokushisa ngendlela efanele. Lezi zinsimbi zinikeza amandla nokukwazi ukushisela okulindelwe abasebenzisi bezimboni, futhi zitholakala kalula ngezindleko ezinengqondo, okwenza zibe yinketho ezenzakalelayo ezinhlelweni eziningi. Insimbi ye-ductile iron enokuqina okuthuthukisiwe nayo iyinketho eqinile, ikakhulukazi ezinhlelweni zamanzi namanzi angcolile, ngoba ihlanganisa izakhiwo ezinhle zokuthulula nokumelana nomthelela okungcono kune-gray iron. Izinto ezihlanganisiwe, ezihlanganisa i-fiberglass-reinforced kanye ne-specialty nylon formulations, ziya zithandwa kakhulu ngenxa yokumelana nokugqwala, isisindo esincane, nokuziphatha okuguquguqukayo ngokwemvelo ngisho nasezingeni lokushisa eliphansi kakhulu. Ngayinye yalezi zinto kufanele ihlolwe hhayi kuphela ngokusebenza kwemishini kodwa nangokuhambisana nezinto ezithile, isigaba sokucindezela, nezidingo zokulawula zohlelo. Ithebula elingezansi lifingqa izici ezibalulekile zokusebenza kwalezi zigaba ezintathu eziyinhloko zezinto ukusiza ekuhloleni kokuqala.

Uma kuqhathaniswa lezi zinto, kubalulekile ukucabangela hhayi nje izindleko zokuqala kodwa nengqikithi yezindleko zobunikazi phakathi nesikhathi sokusebenza esihlosiwe. Insimbi yekhabhoni ephansi yokushisa inikeza inhlanganisela engcono kakhulu yamandla nokufinyeleleka kwezindleko, kodwa idinga ukumbozwa okuvikelayo futhi ingahlaselwa ukugqwala uma ukumbozwa kulimele, kanti insimbi enwebekayo (ductile iron) inikeza ukuqina okuhle kodwa ingaba nzima futhi ibize kakhulu emabangeni amakhulu. Izixhumanisi eziyinhlanganisela (composite couplings) zimelana nokugqwala kakhulu futhi zilula, okunciphisa umsebenzi wokufaka, kodwa amazinga azo okushisa nokucindezela avame ukuba aphansi kunalezo zensimbi, okukhawulela ukusetshenziswa kwazo ezinsizeni ezinokucindezela okuphezulu. Ekusebenzeni, abaqhubi abaningi bagcina inqwaba yezixhumanisi ezigunyaziwe, bekhetha into ngayinye ngokusekelwe ezidingweni ezithile zezigaba zomugqa ngamunye kunokuthi basebenzise indlela eyodwa efanele yonke. Leli qhinga elisebenzayo likhulisa ukuthembeka kuyilapho lilawula izindleko kuyo yonke inethiwekhi enkulu yamapayipi. Okubalulekile ukubhala phansi imibandela yokuthatha izinqumo nokuqinisekisa ukuthi ukuthengwa ngakunye kulandela inqubo efanayo yokuhlola eqinile. Ngokwenza kanjalo, abaqhubi bangakwazi ukumisa izixazululo ezifakazelwe kuyilapho begcina ukuguquguquka ukuze bamukele izimo ezithile zendawo.

Ukuqhathanisa okuqondile kwezindleko nokusebenza kuveza ukuthi ukukhetha kokuxhuma okumelana nokuphuka kudinga umongo kunemithetho evamile. Ama-alloy ensimbi ashiswa ngokushisa okuphansi ngokuvamile abiza u-10-20% ngaphezu kwamazinga ajwayelekile ensimbi yekhabhoni, kodwa anikeza izakhiwo eziqinisekisiwe zokumelana nomthelela kufika ku--50°C, okwenza abe yizinga lokulinganisela emsebenzini obalulekile kawoyela, igesi, nezimboni. I-Ductile iron inikeza inani elihle kakhulu ekusetshenzisweni kwamanzi lapho ingcindezi iphakathi nendawo, futhi i-matrix yayo eqinile imelana nokuphuka nokulimala komthelela, nakuba izinga layo lokushisa eliphansi ngokuvamile liba ku--30°C kuya ku--40°C kuye ngezinga. Izinto ezihlanganisiwe zingase zibe nokuncintisana kwezindleko ngeyunithi ngayinye futhi zinikeze ubuhle obunqumayo besisindo, kodwa umfutho wazo omkhulu ovunyelwe wokusebenza uvame ukukhawulelwa emazingeni aphansi, okukhawulela ukusetshenziswa kwazo emigqeni yokudlulisa ingcindezi ephezulu. Ukwengeza, izinto ezihlanganisiwe zingase zibe nokuziphatha okuhlukile ngaphansi kokuchayeka isikhathi eside emisebeni ye-UV nezimo zomlilo, okumele kucatshangwe ekufakweni kwangaphandle. Ukuhlaziywa komjikelezo wokuphila kufanele kuhlanganise imvamisa yokushintshwa, isikhathi esilindelekile sokusebenza, izindleko zokusebenza zokufaka, nezindleko zokuma komsebenzi, okuvame ukudlula izindleko zento uqobo. Abasebenzisi abenza izinqumo ngokusekelwe kuphela ezindlekweni zeyunithi bavame ukuthola ukuthi ukuxhuma okubonakala kushibhile kuba okubizayo emva kobusika obumbalwa obunzima. Ukuhlolwa okulinganiselayo okubeka ukwethembeka nesikhathi sokusebenza ngokulingana nenani lokuthenga kuzohlala kuletha imiphumela engcono.

IVaricpand International isungule ukuthi ingumkhiqizi nomhlinzeki othembekile wama-coupling ezimboni asezingeni eliphezulu, futhi umugqa wayo wemikhiqizo uklanyelwe ngokuqondile ukuhlangabezana nezidingo zokusebenza kwamapayipi esimo sezulu esibandayo. Uhla lwenkampani luhlanganisa ama-camlock, storz, guillemin, nama-pin lug couplings akhiwe nge-aluminium, ithusi, insimbi engagqwali, nama-composites akhethekile, wonke angacaciswa ngezitifiketi zezinto ezihlolwe ukuthi zisebenza emazingeni okushisa aphansi. Wonke ama-coupling akwaVaricpand akhiqizwa ngaphansi kwezinqubo eziqinile zokulawula ikhwalithi ezihlanganisa ukulandeleka kwezinto, ukuhlolwa kobukhulu, nokuhlolwa kwengcindezi, kuqinisekisa ukuthi iyunithi ngayinye iletha ukusebenza okungaguquki emkhakheni. Ezinhlelweni zokusebenza esimweni sezulu esibandayo, iVaricpand igcizelela leyo mikhiqizo eyenziwe ngezinto ezinamandla emvelo, njenge-316 stainless steel, egcina ukumelana nomthelela okuhle kakhulu ngisho nangaphansi kwezinga lokugandisa, kanye nama-aluminium alloys amelana nokubanda anika isilinganiso esingcono sokuqina nesisindo. Ithimba lobunjiniyela lenkampani lisebenza eduze namakhasimende ukulungisa izixazululo, noma ngabe kusho ukulungisa izinto zokuvala, ukushintsha ubukhulu, noma ukuhlinzeka ngemiphumela ebhaliwe yokuhlolwa komthelela ukuze kutholakale ukugunyazwa ngokomthethonqubo. Le ndlela egxile kumakhasimende, ihlanganiswe nobuchule obujulile bokukhiqiza, yenza iVaricpand ibe uzakwethu othembekile emaphrojekthini lapho ukwehluleka kungenakwenzeka nhlobo.

Izinzuzo zokukhetha i-Varicpand zidlulela ngalé komkhiqizo ngokwawo, zihlanganisa izinga lensiza elinciphisa ubungozi futhi lenze kube lula ukuthenga kwabaqhubi abamatasa. I-Varicpand igcina uhlu oluphelele lwama-couplings ajwayelekile angathunyelwa ngokushesha ezindaweni ezikude, inciphisa isikhathi sokuma esihambisana nokushintshwa okuphuthumayo. Inkampani futhi inikeza Ukuxhumanaisevisi lezixazululo ezenziwe ngokwezidingo zakho, lapho onjiniyela abanolwazi bezinsiza besiza ekucaciseni ukumiswa okufanele kwe-coupling ezimweni ezithile zokusebenza. Ukuhlolwa okuqinile kuyisisekelo sohlelo lwabo lwekhwalithi, nemikhiqizo iqinisekiswa ngokumelene namazinga omhlaba ukuze kuqinisekiswe ukuthi isebenza ezindaweni ezidinga kakhulu. Ngokukhetha ama-coupling e-Varicpand, abasebenzisi bathola ukufinyelela eminyakeni yobuchwepheshe bezimboni, umlando oqinisekisiwe emikhakheni ehlukahlukene, kanye newaranti ekhombisa ukuzethemba kwenkampani emikhiqizweni yayo. Ukuqina emazingeni aphansi okushisa nokumelana nomthelela ophezulu kohlu lwe-Varicpand kuhumushela ngokuqondile ekunciphiseni isikhathi sokuphumula kanye nempilo yesevisi enwetshiwe yezinhlelo zamapayipi ezindaweni ezibandayo. Ezinhlanganweni ezifuna umthengisi oqonda ubunkimbinkimbi besevisi yase-Arctic, ukuhlola okugcweleImikhiqizoIkhathalogi iyindawo enhle kakhulu yokuqala.

Izici ezimbalwa eziqondile zihlukanisa ama-couplings akwa-Varicpand ezimweni zokusebenza ezibandayo, kuqale ngokukhetha ngokucophelela kwenkampani izinto eziyisisekelo eziletha ukusebenza okuqinisekisiwe emazingeni okushisa aphansi. Ama-couplings afaka izinhlelo zokuvala eziqinile, njengama-gasket e-EPDM asezingeni le-FDA kanye nezinhlanganisela ze-elastomer ezenziwe ngokwezifiso ezihlala zivumelana nesimo ku--40°C, zivimbela ukuvuza okubangelwa ukuqina kokuvala. Ukwenziwa ngomshini ngokunembile kuqinisekisa ukuphela kwendawo okungaguquki okunciphisa ukugcwala kwengcindezi, kuyilapho ubukhulu bodonga obuningi ezindleleni ezibalulekile zomthwalo kuthuthukisa ukumelana nokuphuka okuba ngqinsi. I-Varicpand iphinde inikeze i-electroless nickel plating kanye nezindlela ezikhethekile zokwelapha ingaphezulu ezithuthukisa ukumelana nokugqwala ezindaweni zasebusika ezinosawoti, ziqhubekisele phambili impilo yokusebenza. Yonke ibhaji lokukhiqiza libhalwa ngezitifiketi zezinto ezilandeleka emuva emthonjeni wokuqala, zinikeza amakhasimende ukuzethemba okugcwele ebuqothweni bezinto ezihlinzekwayo. Le mininingwane yobunjiniyela, ihlanganiswe nethimba lokusekela eliphendulayo, yenza i-Varicpand ibe ukukhetha okuthandwayo kwabaqhubi abafuna kokubili ukusebenza nokuthula kwengqondo.

Ukuphathwa nokufakwa okufanele ezimweni eziqandayo kubalulekile ukuze kutholakale amandla aphelele e-anti-brittleness coupling, futhi amathiphu ambalwa asebenzayo angathuthukisa kakhulu imiphumela. Okokuqala, izingxenye kufanele zigcinwe endaweni efudumele ngaphambi kokufakwa lapho kungenzeka, futhi uma lokho kungenzeki, i-coupling nama-seals kufanele kufudunyezwe kancane kancane ukuze kugwenywe ukushaqeka okushisayo okungadala imifantu emincane. Abasebenzi kufanele basebenzise ama-torque wrench alinganiswe ukuze asebenze emazingeni okushisa aphansi, futhi kufanele balandele amanani e-torque acaciswe umkhiqizi abheka ukwehla kwe-coefficient of friction esimweni sezulu esibandayo. Kuyahlakanipha futhi ukunciphisa umthwalo wokushaywa ngesikhathi sokuhlanganisa, usebenzisa amathuluzi agunyaziwe kuphela hhayi izando, ezingagxilisa ingcindezi futhi ziqale ukuphuka ezindaweni ezithambekele ekuphukeni. Lapho ufaka endaweni, vikela indawo yokusebenza emoyeni nasemvuleni, ngoba ukungena kweqhwa neqhwa kungangcolisa izindawo zokuvala futhi kukhubaze ubuqotho bejoyinti. Ekugcineni, bhala phansi izimo zokufaka nanoma yikuphi ukuphambuka enkambweni ejwayelekile, ngoba lolu lwazi lubalulekile ekuxazululeni izinkinga nasekuhleleni ukunakekela esikhathini esizayo.

Ukuhlolwa okujwayelekile kwezimpawu zokuqhekeka kufanele kuhlanganiswe kuzo zonke izinhlelo zokunakekela ezingaphambi kokonakala kwamapayipi asendaweni ebandayo, kugxilwe ezindaweni lapho ukugcwala kwengcindezi okungenzeka kubangele ukuqhekeka. Ukuhlola ngamehlo kufanele kubheke ubukhona bemifantu engaphezulu, ukusonteka komzimba wokuxhuma, ukushintsha kombala, kanye nokuvuza endaweni yokuvala, konke lokhu kungakhombisa ukuwohloka kwempahla. Izindlela zokuhlola ezingonakalisi njengokuhlola ngopende ongena emifantwini noma ukuhlola ngamasimu kungathola imifantu engaphansi engabonakali ngamehlo, futhi lokhu kufanele kuhlelwe ngezikhathi ezithile ezindaweni ezixhunywayo ezibalulekile. Amasu okunakekela angaphambi kokonakala kufanele futhi ahlanganise ukuqinisa kabusha izixhumanisi ngezikhathi ezithile, ngoba ukushintshashintsha kokushisa kungadala ukuxegisa, kanye nokushintsha izivalo ngezikhathi ezinconyiwe ngaphambi kokuba zifinyelele ekupheleni kwempilo yazo yokusebenza. Idatha evela ekuhloleni kufanele ilandelwe ngokuhamba kwesikhathi ukuze kutholakale amaphethini akhombisa inkinga ephindelelayo engxenyeni ethile yomugqa noma ekucacisweni kwempahla. Ngokusebenzisa le ndlela eqondile, abasebenzi bangabamba izinkinga ezincane ngaphambi kokuba zibe ukwehluleka okubizayo, baqinisekise ukusebenza okungaphazamiseki ngisho nasezinyangeni ezinzima zasebusika. Uhlelo lokunakekela olwenziwa kahle luyisendlalelo sokugcina sokuvikela esivikela utshalomali olwenziwe kumakoplingi asezingeni eliphezulu kanye nengqalasizinda yamapayipi abasebenza kuyo.

Ukukhetha into efanele yokuxhuma engagqwali (anti-brittleness coupling) emapayipini asezindaweni ezibandayo kudinga ukuqonda okujulile kokushintsha kusuka ekuqineni kuye ekuphukeni (ductile-to-brittle transition), ukuhlola ngokucophelela ukumelana nomthelela nokuqina, kanye nokucabangela ngokulinganisela ukuhambisana, ukufakwa, nezindleko zokuphila kwempilo yomkhiqizo. Izinto ezitholakalayo namuhla, kusukela kuzinsimbi zekhabhoni eziphansi ezisebenza emazingeni okushisa aphansi, insimbi eqinile (ductile iron), kuya kuzinto ezihlanganisiwe ezithuthukile, ngayinye inikeza izinzuzo ezihlukile ezingaqhathaniswa nezidingo ezithile zokusebenza. Abaqhubi abalandela inqubo yokukhetha eqondile futhi basebenzisana nabahlinzeki abanokuhlangenwe nakho bathola ukwethembeka okuphezulu, izindleko eziphansi zokulungisa, nokusebenza okuphephile ezindaweni ezinzima. I-Varicpand International ikulungele ukusekela le mizamo ngohlu olubanzi lwezinto zokuxhuma eziklanyelwe ukuqina emazingeni okushisa aphansi, ezisekelwa ukuhlolwa okuqinile nensizakalo yamakhasimende esheshayo. Ngokuhlanganisa izindlela ezibalulekile zokukhetha ezichazwe kulo mhlahlandlela nokusebenzisa ubuchwephesha babakhiqizi abathembekile, ungavikela inethiwekhi yakho yamapayipi emiphumeleni elimazayo yamakhaza asebusika. Ukuze uthole izincomo ezikhethekile nezeluleko zochwepheshe, siyakukhuthaza ukuba uhloleIzindaba ikhasi ukuze uthole imininingwane yemboni futhi uxhumane nathi ngezindlela zethu zokuxhumana ukuze siqale ubambiswano oluzuzisayo.

Ukushintsha kusuka ekubeni into ithambile iye ekuqhekekeni ububanzi bezinga lokushisa lapho into ishintsha khona ekuziphatheni ngendlela ethambile, emunca amandla, iye ekuziphatheni ngendlela eqhekekayo, ethambekele ekuqhekekeni. Ngaphansi kwezinga lokushisa lokushintsha, into ilahlekelwa amandla okuziguqula ngendlela ephathekayo futhi izoqhekeka noma ichoboze kungazelelwe uma icindezelwa. Yingakho ukukhetha kokuhlanganisa okumelana nokuqhekeka kufanele ngaso sonke isikhathi kucabangele izinga lokushisa elincane kakhulu elilindelekile lokusebenza.

Ukuxhumana kwamapayipi kwehluleka kaningi ezindaweni ezibandayo ngoba amazinga okushisa aphansi anciphisa ukuqina kokwephuka kwezinsimbi eziningi namapholima, okwenza kube lula ukuphuka nokulimala okubangelwa umthelela. Ukufinyela ngenxa yokushisa nakho kudala ingcindezi eyengeziwe emajoyintini, kuyilapho iqhwa namakhemikhali okuncibilikisa iqhwa kungasheshisa ukugqwala nokonakala kwezinsimbi zokuvala. Le miphumela ehlangene ikhulisa ubungozi bokuqhekeka, ukuvuza, nokwehluleka okubi kakhulu ngezimo zasebusika.

Ukusebenza okuhle kakhulu kokumelana nokuphuka kuvame ukutholakala ezingxenyeni zensimbi ezine-carbon ephansi ezifana ne-ASTM A333 ne-A350, eziqinisekisiwe ukuthi zingamelana nomthelela kuze kufike ku--50°C. Insimbi enwebekayo (ductile iron) enokuqina okuthuthukisiwe kanye nezinto ezithile ezimelana nokushisa ezipholile nazo zisebenza kahle ezimweni ezifanele. Ukukhetha kuncike kumfutho wokusebenza, into yepayipi, kanye nokuthi yini edluliswayo.

Ukumelana nomthelela kukala ikhono lezinto ezithile ukumunca amandla ngesikhathi sokulayishwa okungazelelwe ngaphandle kokuphuka, futhi ngokuvamile kuhlolwa kusetshenziswa izindlela ze-Charpy noma ze-Izod. Kubalulekile ezingxenyeni zokuxhuma ezindaweni ezibandayo ngoba ukufakwa, ukudlidliza, nokucindezela okungazelelwe kungabangela amandla angazelelwe izinto ezintekenteke ezingakwazi ukumelana nazo. Izingxenye zokuxhuma ezinokumelana nomthelela okuphezulu ziqinisekisa ukuthi ingxenye ngeke iphuke ngisho noma ngaphansi kokushaqeka okungazelelwe kwemishini.

Kufanele ucele idatha yokuhlolwa komthelela eqinisekisiwe kumkhiqizi ebhala ukusebenza ezingeni lokushisa lakho eliphansi elithile. Bheka izinto ezihlangabezana namazinga afana ne-ASTM A333 ngenani elichaziwe le-Charpy yomthelela ezingeni lokushisa eliphansi elilindelekile. Amashidi edatha omkhiqizi nonjiniyela bezicelo bangaqinisekisa ukuthi umkhiqizo othile ufanele yini izimo zakho.

Yebo, ama-coupling ahlanganisiwe enziwe ngeplastiki eqiniswe nge-fiberglass noma ama-nylon akhethekile angasebenza kahle ezindaweni ezibandayo ngoba agcina ukuvumelana nokushintsha kwezinga lokushisa emazingeni aphansi futhi anikeza ukumelana nokugqwala okuphezulu. Nokho, amazinga abo okucindezela nokushisa ngokuvamile aphansi kunalawo ensimbi, ngakho kufanele baqondaniswe ngokucophelela nezimo zokusebenza. Hlala uqinisekisa isilinganiso sezinga lokushisa eliphansi lomkhiqizi ngaphambi kokucacisa.

Izingxenye kufanele zigcinwe endaweni efudumele ngaphambi kokufakwa, futhi kufanele zifudunyezwe kancane kancane ukuze kugwenywe ukushaqeka okubangelwa ukushisa. Abasebenzi kufanele basebenzise amawrench e-torque alinganisiwe anamanani e-torque afanele ukubanda, futhi bagweme amathuluzi okushaya angadala ukugcwala kwengcindezi. Ukuvikela indawo yokusebenza emoyeni, eqhweni, nasekhephini nakho kubalulekile ukuze izindawo zokuvala zihlale zihlanzekile futhi zomile.

Ukuhlola okuvamile ngamehlo kufanele kubheke imifantu ebusweni, ukuguquka kwesimo, ukuvuza kokuvala, nokushintsha kombala, okungakhombisa ukuqala kokufa ngenxa yokuqina. Ukuhlola okungonakalisi okufana nokuhlola nge-dye penetrant noma nge-magnetic particle kungathola izinkinga ezingaphansi kwesikhumba. Ukuhlela lezi zihlolo phakathi nangemva kobusika kuyingxenye ebalulekile yohlelo olusebenzayo lokuvimbela nokunakekela.

I-Varicpand International inikeza uhla olubanzi lwama-coupling akhiqizwa ngezinto eziqinisekisiwe ukuthi zihlala isikhathi eside emazingeni okushisa aphansi futhi zimelela umthelela ophezulu. Inkampani igcina ukulawulwa kwekhwalithi okuqinile, inikeza ukwesekwa kobunjiniyela ngokwezifiso, futhi inikeza insiza esheshayo enciphisa isikhathi sokuphumula. Imikhiqizo yabo isekelwa ukuhlolwa okubhaliwe nobuchwepheshe bezimboni, okubenza babe uzakwethu onokwethenjelwa ekusebenzeni kwamapayipi ezimweni ezibandayo.

Izixhumi ezilinganiselwe emazingeni okushisa aphansi ngokuvamile zibiza u-10-20% ngaphezulu kunezinga elijwayelekile ngenxa yama-alloys akhethekile, ukwelashwa ngokushisa, nokuhlolwa kwekhwalithi. Kodwa-ke, le nani elengeziwe livame ukuncishiswa yimpilo yesevisi ende, ukuncishiswa kokushintshwa okuphuthumayo, nezindleko eziphansi zokuma komsebenzi. Abasebenzisi kufanele bahlole izindleko zomjikelezo wempilo yonke hhayi intengo yokuthenga kuphela ukuze benze isinqumo esingcono kakhulu ngokomnotho.