1. Kunezindlela ezine zokupholisha ze-bi-phaseinsimbi flange: manual, mechanical, chemical and electrochemical. Ukumelana nokugqwala kanye nomhlobiso wei-flangeingathuthukiswa ngokupholisha. Uketshezi olukhona lukagesi lokupholisha lwensimbi engagqwali lusasebenzisa i-phosphoric acid ne-chromic anhydride. Ngenqubo yokupholisha nokuhlanza, enye i-chromium ne-phosphorus izokhishelwa emanzini angcolile, okubangele ukungcoliswa kwemvelo.

2. Ifilimu ye-Passivation izokwakhiwa ebusweni be-duplexinsimbi flange, futhi ifilimu ye-oxide izoqala ukuhlakazeka. Ngoba i-microstructure engaphezulu ye-duplexinsimbi flangeakuhambisani, ingxenye engaphezulu ejike kancane incibilika ngokukhethwayo, futhi izinga lokuhlakazeka lizoba phezulu kunalelo lengxenye ye-concave. Ukuqedwa kanye nokwakheka kwe-membrane cishe ngesikhathi esifanayo, kodwa i-velocities yabo ihlukile. Ngenxa yalokhu, ubulukhuni obungaphezulu be-bi-phase steel flange buyancipha, okuholela endaweni ebushelelezi, ecwebezelayo.
3. Okunye ukukhubazeka okufana nezimbotshana ezingaphezulu kanye nokuklwebheka kungagcwaliswa ngokupholisha, ukuze kuthuthukiswe ukumelana nokukhathala kanye nokumelana nokugqwala okuhlobene. Ama-Biphase steel flange anamandla angaphezu kokuphindwe kabili esivuno se-austenitic stainless steel, futhi anepulasitiki nokuqina okwanele okudingekayo kulokhu kubumba, kanye nokumelana nokuqhekeka kokugqwala kwengcindezi, ikakhulukazi ezindaweni ezine-chloride.