Xa kukhethwa iimpompo zamanzi, ukuba ukhetho alulunganga, ixabiso linokuba phezulu okanye ukusebenza kwempompo kusenokungahlangabezani neemfuno zendawo. Ngoku nika umzekelo ukubonisa imigaqo ethile ekufuneka ilandelwe yimpompo yamanzi.
Ukukhethwa kwepompo yokufunxa kabini kufuneka kuqwalaselwe la manqaku alandelayo:
1. Isantya:
Isantya esiqhelekileyo simiselwa ngokweemfuno zomthengi. Okukhona isantya sepompo efanayo siphantsi, izinga lokuhamba kunye nokuphakamisa okufanayo kuya kuncipha. Xa ukhetha imodeli, kuyimfuneko ukuqwalasela kungekuphela nje ukusebenza kwezoqoqosho, kodwa kunye neemeko zendawo, ezinje: i-viscosity yesixhobo, ukumelana nokuguguleka, amandla okuzibeka, izinto zokungcangcazela, njl.njl.
2. Ukugqitywa kwe-NPSH:
I-NPSH ingamiselwa ngokwexabiso elinikwe ngumthengi, okanye ngokweemeko zokungena kwepompo, ubushushu obuphakathi kunye noxinzelelo lomoya kwindawo:
Ukubalwa kobude bokufakelwa kwepompo yamanzi (i-algorithm elula: ngokwengcinezelo eqhelekileyo yomoya kunye nobushushu obuqhelekileyo bamanzi) yile ilandelayo:
Phakathi kwazo: i-hg—ubude bofakelo lwejometri (ixabiso elihle kukutsalwa phezulu, ixabiso elibi lihamba ngokubuyela umva);
—Intloko yamanzi oxinzelelo lomoya kwindawo yokufakelwa (ebalwe njenge-10.33m phantsi koxinzelelo oluqhelekileyo lomoya kunye namanzi acocekileyo);
hc—ukulahleka kwe-hydraulic yokufunxa; (ukuba umbhobho wokungena umfutshane kwaye awunzima, uhlala ubalwa njenge-0.5m)
—Intloko yoxinzelelo lomphunga; (amanzi acocekileyo kubushushu begumbi abalwa njenge-0.24m)
— I-NPSH evumelekileyo; (ukuqinisekisa ukhuseleko, bala ngokwe-NPSHr×1.2, NPSHr jonga ikhathalogu)
Umzekelo, i-NPSH NPSHr=4m: Emva koko: hg=10.33-0.5-0.24-(4×1.2)=4.79 m (isiphumo sokuhlawula sixabiso elihle, oko kuthetha ukuba inokufunxa ukuya kuthi ga kwi-≤4.79m, oko kukuthi, inqanaba lokungena kwamanzi linokuba kwi-impeller Ngaphakathi kwe-4.79m ngaphantsi komgca ophakathi; ukuba iphantsi koxinzelelo olubi, kufuneka igalelwe umva, kwaye ixabiso lokugalela umva kufuneka libe likhulu kunexabiso elibaliweyo, oko kukuthi, inqanaba lokungena kwamanzi linokuba ngaphezulu kwexabiso elibaliweyo ngaphezulu komgca ophakathi we-impeller).
Oku kungasentla kubalwa phantsi kwemeko yobushushu obuqhelekileyo, amanzi acacileyo kunye nokuphakama okuqhelekileyo. Ukuba ubushushu, uxinano kunye nokuphakama kwesixhobo esiphakathi aziqhelekanga, ukuze kuthintelwe ukuxinana kunye nezinye iingxaki ezichaphazela ukusebenza okuqhelekileyo kweseti yepompo, amaxabiso afanelekileyo kufuneka akhethwe aze afakwe kwifomula yokubala. Phakathi kwazo, ubushushu kunye noxinano lwesixhobo esiphakathi lubalwa ngokwexabiso elihambelanayo kwi "Vaporization Pressure and Density of Water at Different Temperatures", kwaye ukuphakama kubalwa ngokwexabiso elihambelanayo kwi "Altitude and Atmospheric Pressure of Major Cities in the Country". Enye i-NPSH evumelekileyo kukuqinisekisa ukhuseleko, ngokwe-NPSHr×1.4 (eli xabiso liyi-1.4 ubuncinane).
3. Xa uxinzelelo lokungena lwepompo eqhelekileyo luyi-≤0.2MPa, xa uxinzelelo lokungena + intloko × amaxesha ayi-1.5 ≤ uxinzelelo loxinzelelo, khetha ngokwezinto eziqhelekileyo;
Uxinzelelo lokungena + intloko × 1.5 amaxesha > uxinzelelo lokucinezela, kufuneka kusetyenziswe izixhobo ezisemgangathweni ezihlangabezana neemfuno; ukuba uxinzelelo lokungena luphezulu kakhulu okanye uxinzelelo lovavanyo luphezulu kakhulu, njl. ezingahlangabezani neemfuno, nceda uqinisekise ngetekhnoloji yokutshintsha izinto okanye ukulungisa isikhunta kunye nokwandisa ubukhulu bodonga;
4. Iimodeli zesitywina soomatshini bepompo eqhelekileyo zezi: M7N, M74 kunye ne-M37G-G92 series, ekufuneka isetyenziswe ixhomekeke kuyilo lwepompo, izinto zesitywina soomatshini eziqhelekileyo: lukhuni/luthambileyo (i-tungsten carbide/graphite); xa uxinzelelo lokungena luyi-≥0.8MPa, kufuneka kukhethwe isitywina soomatshini esilinganayo;
5. Kucetyiswa ukuba ubushushu obuphakathi bepompo yokufunxa kabini bungadluli kwi-120°C. Xa i-100°C ≤ ubushushu obuphakathi ≤ 120°C, ipompo eqhelekileyo kufuneka ilungiswe: umngxuma wokutywina kunye nenxalenye yokuthwala kufuneka zixhotyiswe ngamanzi okupholisa ngaphandle komngxuma wokuphola; zonke ii-O-rings zepompo zenziwe ngazo Zombini ezi zixhobo: irabha ye-fluorine (kubandakanya netywina lomatshini).
Ixesha lokuthumela: Meyi-10-2023