Ukuqaliswa kwezixhobo zevalvu yokususa ityuwa emanzini olwandle

Kwiminyaka yakutshanje, ngokuphuculwa kwemigangatho yokuphila kwabantu kunye nophuhliso lwemizi-mveliso, ukusetyenziswa kwamanzi ahlaziyekileyo kuye kwanda unyaka nonyaka.Ukuze kusonjululwe ingxaki yamanzi, iiprojekthi ezininzi ezinkulu zokukhupha ityuwa ziphantsi kolwakhiwo olumandla kweli lizwe.Kwinkqubo yokuchithwa kwamanzi olwandle, ingqalelo ekhethekileyo kufuneka ihlawulwe kwi-corrosion ye-chloride kwizixhobo.Ivalveiingxaki eziphathekayo zidla ngokuvela kumacandelo flow-through.Okwangoku, izinto eziphambili zezinto zevalve yokuchithwa kwamanzi olwandle yi-nickel-aluminium bronze, insimbi engenasici, i-duplex stainless steel kunye ne-ductile iron + coating metal.

I-Nickel Aluminium Bronze

Ubhedu lwe-nickel-aluminiyam lunokuchasana kakuhle noxinzelelo lwe-corrosion, i-corrosion yokudinwa, i-cavitation corrosion, ukumelana nokhukuliseko kunye nokungcoliswa kwezinto zaselwandle.Xa kuthelekiswa nensimbi engenasici emanzini olwandle aqukethe i-3% ye-NaCI, i-nickel-aluminium i-alloy ye-bronze i-alloy ye-bronze inokuchasana kakuhle nomonakalo we-cavitation.Ukudleka kwe-nickel aluminiyam yobhedu emanzini olwandle ibeka i-corrosion kunye ne-crevice corrosion.Ubhedu lwe-nickel-aluminiyam lunovakalelo kwisantya samanzi olwandle, kwaye xa isantya sidlula isantya esibalulekileyo, isantya sokutya sinyuka kakhulu.

Yenziwe ngentsimbi eshayinayo

Ukuxhatshazwa kwe-corrosion yensimbi engenasici kuyahluka kunye nokubunjwa kweekhemikhali zezinto eziphathekayo.I-304 insimbi engenasici iyamelana ne-corrosion ye-pitting kunye ne-crack corrosion kwindawo yamanzi equkethe i-chlorides, kwaye ayikwazi ukusetyenziswa njengenxalenye yokuhamba-ngokudlula emanzini olwandle.I-316L yi-austenitic stainless steel equkethe i-molybdenum, enokumelana ngcono kwi-corrosion jikelele, i-pitting corrosion kunye ne-crack corrosion.

Intsimbi yentsimbi

Ukuze kuncitshiswe iindleko zeprojekthi, i-valve body ithatha i-EPDM ye-ductile iron lining, kwaye i-valve disc ithatha i-ductile iron lining anti-corrosion coating.

(1) I-Ductile intsimbi ye-Halar

I-Halar yi-copolymer etshintshanayo ye-ethylene kunye ne-chlorotrifluoroethylene, i-semi-crystalline kunye ne-melt-processable fluoropolymer.Inokumelana ne-corrosion kuninzi lweekhemikhali eziphilayo kunye ne-organic kunye nezinyibilikisi eziphilayo.

(2) I-Ductile iron lining Inayiloni11

I-Nylon11 yi-thermoplastic kunye ne-plant-based coating, enokuthi ithintele ukukhula kunye nokukhula kwe-fungi.Emva kweminyaka eyi-10 yovavanyo lokuntywiliselwa kwamanzi etyuwa, isinyithi esisezantsi asinazo iimpawu zokubola.Ukuze kuqinisekiswe ukuzinza kwengubo kunye nokubambelela kakuhle, ukushisa kokusetyenziswa kweNylon11 akufanele kudlule i-100 ℃ xa isetyenziswe kwisitya sebhabhathane.Xa i-medium ejikelezayo iqulethe iinqununu ze-abrasive okanye imisebenzi yokutshintsha rhoqo, akufanelekanga ukusebenzisa i-coating.Ukongezelela, ukugquma kufuneka kuthintelwe ukuba kukhutshwe kwaye kukhutshwe ngexesha lokuthutha kunye nokufakwa.