Indlela yokukhetha uMboneleli weZinto zoMbhobho kwiProjekthi yakho

Intshayelelo

Umthengisi wezixhobo zombhobho wenza okungaphezulu nje kokuhambisa imibhobho, iivalvu, kunye nezinto zokufakelwa—zichaphazela umgangatho wemveliso, amaxesha okufakwa, ulawulo lohlahlo-lwabiwo mali, kunye nokuthotyelwa kwemithetho. Ukukhetha iqabane elifanelekileyo kuthetha ukujonga ngaphaya kwamaphepha exabiso ukuze kuvavanywe ubunzulu bempahla, amaxesha okukhokela, imigangatho yesatifikethi, inkxaso yobugcisa, kunye nokungaguquguquki kwiiodolo. Kwabakhi, abaphuhlisi, kunye namaqela ezakhiwo, ukhetho olubi lomthengisi lunokukhokelela ekulibazisekeni, ekutshintsheni iiodolo, kunye nemiba yokuhlolwa, ngelixa olomeleleyo lunokunciphisa umngcipheko kuyo yonke iprojekthi. Eli nqaku lichaza iikhrayitheriya eziphambili zokuthelekisa ababoneleli ngokufanelekileyo, ukuze ukwazi ukwenza isigqibo esisebenzayo esixhasa zombini iimfuno zokuthenga ezikhawulezileyo kunye nokusebenza kweprojekthi ixesha elide.

Indlela Yokuvavanya Umthengisi Wezinto Zokufaka Ipayipi

Ukukhetha ekuneneumthengisi wezixhobo zombhobhosisigqibo esisisiseko sayo nayiphi na iprojekthi yokwakha okanye yokuhlaziya. Ikhonkco lokubonelela alichazi kuphela ukuthembeka okubonakalayo kweenkqubo zokuhambisa ulwelo kodwa likwalawula impumelelo yezemali kunye neshedyuli yalo lonke umzamo. Ukuvavanya aba bathengisi kufuna ukugqitha ukukhangela nje ikhathalogu ukuze kuhlolwe ukuthembeka kokusebenza kunye nobuchule bobuchwephesha.

Kutheni Ukukhethwa Kwabathengisi Kuchaphazela Iindleko, Ishedyuli, kunye Nokuthobela Imithetho

Ukuthengwa kwemibhobho, iivalvu, kunyeizixhobo zokufakelwa(PVF) imele inxalenye enkulu yeendleko zeprojekthi iyonke. Kwizakhiwo zorhwebo eziqhelekileyo, uhlahlo-lwabiwo mali lwe-mechanical, electrical, kunye ne-plumbing (MEP) lubandakanya i-35% ukuya kwi-45% yeendleko zizonke, apho izixhobo ze-plumbing zithatha isabelo esikhulu. Ukukhethwa kwababoneleli kuchaphazela ngokuthe ngqo ezi ndleko ngokusebenzisa izakhiwo zamaxabiso, iindleko zokuthutha, kunye nolawulo lwezinto ezifunekayo.

Ngaphezu koko, iishedyuli zeprojekthi zinobuthathaka kakhulu kumaxesha okukhokela izinto. Ukulibaziseka kokuhanjiswa kwezinto ezibalulekileyo kunokubangela umonakalo wemihla ngemihla oqala kwi-$500 ukuya kwi-$2,000, kuxhomekeke kwisikali sekhontrakthi. Ukuthobela umthetho kubaluleke ngokulinganayo; ukusebenzisa umthengisi onikezela ngengozi izinto ezingathobeliyo okanye ezingeyonyani kunokubangela ukungaphumeleli kokuhlolwa kukamasipala, ukukrazulwa kweendleko ezibizayo, kunye namatyala amakhulu omthetho.

Indlela Ababoneleli Bezinto Zombhobho Abahluke Ngayo Kubathengisi Abaqhelekileyo

Ababoneleli bezinto zokwakha ngokubanzi bagcina uluhlu olubanzi lwezinto eziquka imisebenzi emininzi, nto leyo edla ngokunciphisa ubuchule babo bobuchwephesha kulo naluphi na udidi olunye. Ngokwahlukileyo koko, ababoneleli bezinto zombhobho abazinikeleyo baqesha iingcali eziqonda ubunjineli obuntsonkothileyo obungasemva kokuguquguquka kolwelo, ukulinganiswa koxinzelelo, kunye nokuhambelana kweekhemikhali.

Umzekelo, umthengisi okhethekileyo unokwahlula ngoko nangoko phakathi kwemibhobho ye-polyethylene ye-Standard Dimension Ratio (SDR) 11 kunye ne-SDR 17, ecebisa ngesicelo esifanelekileyo ngokusekelwe kuxinzelelo lokusebenza. Olu lwazi lukhethekileyo luqinisekisa ukuba abakhi bafumana ukuhambelana okuchanekileyo kweenkcukacha endaweni yokutshintshwa okuqhelekileyo okunokuphazamisa ukuthembeka kwenkqubo ngexesha layo lobomi.

Iikhrayitheriya zoMgangatho weMveliso kunye nokuThotyelwa kweMithetho

Uvavanyo oluqinileyo lomgangatho wemveliso kunye nokuthotyelwa kwemithetho kuqinisekisa ukuba iziseko zophuhliso lwemibhobho ziya kusebenza ngokukhuselekileyo kulo lonke ixesha elicwangcisiweyo. Ababoneleli kufuneka babonise ukuzibophelela okungagungqiyo kwimigangatho yoshishino kunye nokulandelelwa kwezinto.

Iindidi zezinto eziphathekayo, iinkcukacha, kunye nokuhambelana kwenkqubo

Iinkqubo zemibhobho zanamhlanje zixhomekeke kwizinto ezahlukeneyo, kuquka ubhedu,i-polyethylene edibeneyo (i-PEX), i-polyvinyl chloride (PVC), kunye nentsimbi ephosiweyo. Udidi ngalunye lwezinto lunemilinganiselo engqongqo yokumelana; umzekelo, iityhubhu zobhedu ezikumgangatho wezorhwebo kufuneka zinamathele kumlinganiselo wobukhulu bodonga obuyi-±0.005 intshi ukuqinisekisa ukusebenza okukhuselekileyo kwe-brazing kunye nokusebenza kokufaka i-press.

Ukuhambelana kwenkqubo yenye into ebalulekileyo. Umthengisi onobuchule uqinisekisa ukuba iipayipi, izixhobo, kunye neekhompawundi zokudibanisa zivela kwimigca yokuvelisa ehambelanayo, nto leyo ethintela ukugqwala kwe-galvanic okanye ukuwohloka kwamakhemikhali ngaphambi kwexesha.

Iziqinisekiso, iiRekhodi zoVavanyo, ukuLandelwa, kunye nokuThotyelwa kweKhowudi

ce

Ukuthobela imithetho kubeka ukuba zonke izinto zamanzi okusela zihlangabezane nemigangatho yezempilo engqongqo, ingakumbi i-NSF/ANSI 61, ethintela ukutsalwa kwelothe kunye nezinye izinto ezingcolisayo emanzini okusela. Ababoneleli abathembekileyo bagcina iirekhodi zovavanyo olupheleleyo kunye neeNgxelo zoVavanyo lweMill (MTRs) zeemveliso zabo zesinyithi, beqinisekisa ukulandeleka ngokupheleleyo ukusuka kwindawo yokusekwa ukuya kwindawo yokusebenza.

Iindlela ezilungileyo zoshishino zifuna ukuba ababoneleli bagcine ezi rekhodi zokulandelela ubuncinane iminyaka emi-5 ukuxhasa uphicotho lwasemva kokwakhiwa. Ngaphezu koko, ababoneleli abaphezulu bajonga ngenkuthalo imilinganiselo yabo yangaphakathi yokulawula umgangatho, bezama ukuba izinga leziphene lingaphantsi kwe-0.5% kwimigca yabo ephambili yemveliso ukuze kupheliswe ukusilela kwendawo yokusebenza.

Indlela yokuthelekisa uluhlu lwemveliso, amaxesha okukhokela, kunye nokufumaneka kwayo

Ukuvavanya uluhlu lweemveliso zomthengisi kubandakanya ukuhlalutya amandla abo okufezekisa uluhlu olupheleleyo lwezinto ezifunekayo ngaphandle kokudinga abathengisi abaninzi. Abaphathi bokuthenga kufuneka bathelekise amaxesha aqhelekileyo okukhokela kunye neshedyuli yeprojekthi.

Nangona izinto eziqhelekileyo ezifana ne-2-intshi Schedule 40 PVC zinokufumaneka ukuze zithunyelwe ngosuku olulandelayo, izinto ezikhethekileyo ezifana nezithinteli zokubuyela umva ezinkulu okanye ii-manifolds zentsimbi engagqwali ezenziwe ngokwezifiso zihlala zifuna amaxesha okunikezelwa kwempahla kwiiveki ezi-4 ukuya kwezi-6. Umthengisi oqinileyo ugcina isitokhwe esaneleyo sokunciphisa ukulibaziseka kwefektri, enika ukucaca malunga namanqanaba empahla ekhoyo kunye nemihla yokubuyisela impahla elindelweyo.

Inkonzo, Amaxabiso, kunye namandla eCandelo loNikezelo

Ngaphandle kweemveliso ezibonakalayo, iziseko zokusebenza zomthengisi wezixhobo zombhobho zimisela ukuthembeka kwazo njengeqabane leprojekthi ixesha elide. Ukuguquguquka kwezemali kunye nokusebenza kakuhle kweenkqubo kubaluleke kakhulu ekugcineni iishedyuli zokwakha zisebenza ngendlela eyiyo.

Imigaqo yoRhwebo, uBume bamaxabiso, kunye neMiqathango yokuhlawula

Imigaqo yorhwebo enikezelwa ngumthengisi ichaphazela kakhulu ukuhamba kwemali komkontilaki. Imiqathango eqhelekileyo yokuhlawula ishishini idla ngokusebenza kwimigaqo yeNet 30 ukuya kwiNet 60, evumela abakontilaki ukuba bafumane iintlawulo zenkqubela phambili kumthengi ngaphambi kokuba bahlawule ii-invoyisi zezinto ezibonakalayo.

Iiprojekthi ezinomthamo omkhulu zihlala zifuna iindlela zokubeka amaxabiso ezixoxiswanayo, apho ababoneleli banokubonelela ngezaphulelo zomthamo eziqala kwi-2% ukuya kwi-5% kwizinto ezithengwayo ngonyaka ezidlula i-$100,000. Ukongeza, izaphulelo zokuhlawula kwangethuba, ezifana ne-2/10 Net 30, zibonelela ngezibonelelo zemali ezinokuphucula imida yeprojekthi iyonke ukuba iqumrhu elithengayo ligcina imali eninzi.

Ubunzulu bezinto ezisetyenzisiweyo, indawo yokugcina impahla, kunye nokusebenza kokuhanjiswa kwazo

Umthamo wokugcina impahla womthengisi uhambelana ngokuthe ngqo nokukwazi kwakhe ukuhambisa impahla ngexesha elifanelekileyo. Ukuvavanya ubunzulu bempahla kufuna ukujonga izinga lokuzaliswa kwee-odolo zomthengisi, elifanele lidlule rhoqo kwi-98% kwizinto eziqhelekileyo zesitokhwe.

Ababoneleli abaneulawulo lwendawo yokugcina impahla oluphucukileyoIinkqubo (i-WMS) zinokuphucula ukuhanjiswa kwezixhobo kunye nokubekwa kwazo, ziqinisekisa ukuba izixhobo zifika kwindawo yomsebenzi kanye ngexesha abasebenzi bokufaka abazidinga ngalo. Ukusebenza kokuhanjiswa kulinganiswa ngakumbi ngokuphindaphindiweyo kwee-backorders kunye nokuchaneka kweempawu zokuthunyelwa—iimetrikhi ezichaphazela ngokuthe ngqo ukusebenza kakuhle kwabasebenzi ngokunciphisa ixesha lokungasebenzi.

Uthelekiso lweNdawo kunye nolweSizwe kunye nolweeNkonzo eziKhethekileyo

Amaqela okuthenga kufuneka alinganise iingenelo zababoneleli basekuhlaleni, besizwe, kunye nabakhethekileyo ngokusekelwe kwiimfuno ezithile zeprojekthi.

Abasasazi belizwe lonke basebenzisa iindlela ezingabizi kakhulu ukubonelela ngamaxabiso akhuphisanayo kwiiodolo ezinkulu, ngelixa ababoneleli bendawo begqwesa ngobuchule kunye nenkonzo eyenzelwe wena ngokweemfuno zomsebenzi ezikhawulezileyo nezingalindelekanga.

Inkqubo Yokukhuthala Nokuvavanya Umthengisi

Ukuseka inkqubo yokuqwalasela ngokusemthethweni kuthintela iimpazamo zokuthenga ezibizayo. Uvavanyo olucwangcisiweyo lwahlula abathengisi abafanelekileyo kumaqabane abalaseleyo othungelwano lokubonelela, ukuqinisekisa ukuba iingozi zeprojekthi ziyancitshiswa ngaphambi kokuba kukhutshwe ii-odolo zokuthenga.

Indlela Yokuqinisekisa Ababoneleli Ngaphambi Kokuba Bafaneleke Usebenzisa Iingxelo kunye neMbali yeProjekthi

Ukuqinisekisa umboneleli wezixhobo zombhobho kuqala kufuna uphando olunzulu malunga nokusebenza kwazo kwimbali. Amagosa okuthenga kufuneka acele iireferensi ezivela kwiiprojekthi ezinobukhulu obufanayo nobuntsonkothileyo ezigqityiweyo kwiminyaka emi-3 ukuya kwemi-5 edlulileyo.

Ukuphanda uzinzo lwezemali kubaluleke ngokulinganayo; ukusebenzisa amanqaku ezezimali avela kumntu wesithathu, njengeengxelo zikaDun & Bradstreet, kunceda ukuqinisekisa ukuba umthengisi unemali eyinkunzi yokugcina imisebenzi kunye nemigaqo yekhredithi eqhubekayo kulo lonke ixesha leprojekthi. Ukujonga imbali yetyala ukuze ubone iingxabano zekhontrakthi okanye amabango oxanduva lwemveliso kubonelela ngolunye ulwahlulo lokunciphisa umngcipheko.

Inkqubo yokunika amanqaku kunye novavanyo lwababoneleli ngamanyathelo

Ukusebenzisa i-weighted scoring matrix kumisela inkqubo yovavanyo kwaye kususa ucalucalulo oluvela kwizigqibo zokuthenga. Imodeli yokunika amanqaku esebenza kakuhle kakhulu inika iipesenti ezithile kwizalathisi zokusebenza ezibalulekileyo.

I-matrix esemgangathweni inokwabela i-40% yokukhuphisana kwamaxabiso, i-30% yokuthembeka kokuhanjiswa kunye nobunzulu bempahla, i-20% yokuqinisekiswa komgangatho kunye nokuthobela imithetho, kunye ne-10% yenkxaso yobugcisa kunye nenkonzo yabathengi. Umthengisi ngamnye unikwa amanqaku aphuma kwi-100 amanqaku anokwenzeka, kunye nemigaqo-nkqubo yokuthenga edla ngokufuna umda omncinci wokudlula wamanqaku angama-80 ukuze ifakwe kuluhlu lwabathengisi oluvunyiweyo. Olu vavanyo lwenyathelo ngenyathelo luqinisekisa ukuba zonke izindululo zihlalutywa ngelensi ehambelanayo nengakhethi cala.

Ukukhetha uMboneleli Ofanelekileyo kwiProjekthi Yakho

Isiphelo senkqubo yovavanyo kukulungelelaniswa kweqhinga lomthengisi okhethiweyo kunye nemilinganiselo echanekileyo yeprojekthi yokwakha okanye yokulungisa. Ukuhambelana ngononophelo kuqinisekisa zombini intsebenziswano yokusebenza kunye nokusebenza kakuhle kwezemali.

Indlela yokuHlanganisa ukhetho loMboneleli nohlobo lweProjekthi kunye

Iimfuno zoThengo

Ukukhethwa kwababoneleli kufuneka kulungiselelwe iintlobo ezithile zeprojekthi. Uphuhliso lwezorhwebo oluphezulu lufuna umboneleli onokukwazi ukusingatha ukuhanjiswa okukhulu, okucwangcisiweyo kwesinyithi esityhidiweyo kunye nobhedu olunzima ngexesha leenyanga ezili-18. Kwelinye icala, ulwahlulo olukhulu lwezindlu zokuhlala lufuna umboneleli onokubonelela ngokuthunyelwa okuqhubekayo, okuphezulu kweetyhubhu ze-PEX kunye nezixhobo ezisemgangathweni kunye nexesha elincinci lokufumana umsebenzi.

Ukuhambelana kweemfuno zokuthenga kuquka nokuvavanya izakhono zedijithali. Iiprojekthi ezisebenzisa i-Building Information Modeling (BIM) zixhamla kakhulu kubaboneleli abanokubonelela ngeemodeli zemveliso ze-3D ezinokukhutshelwa kwaye zidityaniswe ngokuthe ngqo nesoftware yokuthenga nge-Electronic Data Interchange (EDI), zilungelelanisa inkqubo yoku-odola kwaye zinciphise iindleko zolawulo.

Indlela Yokulinganisela Ixabiso Eliphantsi Xa Lithelekiswa Nexabiso Elipheleleyo

Eyona ngxaki ixhaphakileyo ekuthengweni kukukhetha umthengisi wezinto zombhobho ngokusekelwe kuphela kwixabiso eliphantsi lokuqala. Ixabiso lokwenyani limiselwa ngokubala iTotal Cost of Ownership (TCO), echaphazela izinto ezifunekayo, amazinga eziphene, kunye nenkxaso yokusebenza.

Umboneleli onikezela ngokunciphisa amaxabiso eyunithi nge-5% ekugqibeleni unokubiza iprojekthi imali engaphezulu ukuba ukulibaziseka kokuhanjiswa kubangela umsebenzi ongasebenziyo okanye ukuba izixhobo ziyasilela phantsi kovavanyo loxinzelelo. Umzekelo, ukunyuka kwe-10% kwiindleko zabasebenzi ngenxaizixhobo ezinganyamezelaniyookanye izinto ezingekhoyo ziya kudla ngokukhawuleza naziphi na izinto ezigciniweyo kwangaphambili. Ngokulinganisa amaxabiso akhuphisanayo nokuthembeka okuqinisekisiweyo, iziqinisekiso ezipheleleyo, kunye nenkxaso yobugcisa eqinileyo, abaphathi beeprojekthi baqinisekisa uthungelwano lokubonelela oluhlala luqinile olukhusela inzuzo kunye nokuthembeka kwesakhiwo sexesha elide.

Izinto ezibalulekileyo ekufuneka ziqwalaselwe

• Izigqibo ezibaluleke kakhulu kunye nesizathu somthengisi wezixhobo zemibhobho
• Iinkcukacha, ukuthobela imithetho, kunye nokuhlolwa komngcipheko okufuneka kuqinisekiswe ngaphambi kokuba uzibophelele
• Amanyathelo alandelayo asebenzayo kunye nezilumkiso abafundi abanokuzisebenzisa ngoko nangoko

Imibuzo ebuzwa qho

Yintoni ekufuneka ndiyijonge kuqala xa ndikhetha umthengisi wezinto zombhobho?

Qala ngokuthobela imithetho kunye nokulingana kwemveliso. Qinisekisa ukuba umthengisi ubonelela ngeepayipi eziqinisekisiweyo, iivalvu, kunye nezixhobo, iinkcukacha ezicacileyo, kunye namaxwebhu anjengeerekhodi zovavanyo okanye ukulandeleka kwezinto ngokweemfuno zeprojekthi yakho.

Kutheni ukhetha umthengisi wezixhobo zombhobho okhethekileyo endaweni yomthengisi oqhelekileyo?

Umthengisi okhethekileyo uyaziqonda iireyithingi zoxinzelelo, ukuhambelana kwezinto, imigangatho yokufakela, kunye neemfuno zekhowudi, ekunceda uphephe ukutshintshwa okungafanelekanga, ukulibaziseka kokufakwa, kunye nemiba yokusebenza kwenkqubo.

Zeziphi iziqinisekiso ezibalulekileyo kwizinto zokufaka imibhobho?

Kwiinkqubo zamanzi okusela, khangela ukuthobela i-NSF/ANSI 61. Ngokuxhomekeke kwizinto ezisetyenzisiweyo, qinisekisa nemigangatho efanelekileyo ye-ASTM, i-CISPI, okanye eminye imigangatho echazwe kwiprojekthi ngaphambi kokuba uthenge.

Ndingayinciphisa njani imingcipheko yexesha lokusebenzisa izinto zombhobho?

Cela uluhlu lwangoku lwezinto ezisetyenzisiweyo, amaxesha aqhelekileyo kunye namaxesha akhethekileyo okufumana izinto, imihla yokubuyisela izinto ezisetyenzisiweyo, kunye neendlela zokuhambisa. Oda iimveliso eziza kuthengwa kwangethuba, ingakumbi izinto ezifakelweyo, ii-manifolds, okanye izinto ezinkulu zokuthintela ukuhamba kwamanzi.

Zeziphi iimveliso zemibhobho endinokuzihlola kwi-NBFH Metal?

Ungaphonononga iimveliso ezinxulumene nemibhobho efana nezinto zokufaka izinto ezishicilelweyo kunye nezinye izisombululo zokufakela kwi-nbfh-metal.com, uze uthelekise iinkcukacha, ukuhambelana, kunye nokufumaneka kwazo neemfuno zeprojekthi yakho.