Flangezaɓi dole ne ya dace da buƙatun ƙira. Lokacin da zane ba ya buƙatar, ya kamata ya kasance daidai da tsarin babban matsin lamba, babban zafin aiki, matsakaicin aiki,flangedarajar kayan abu da sauran abubuwan cikakken zaɓi na nau'i mai dacewa da ƙayyadaddun flange.
Flangedole ne a bincika kafin shigarwa, saman ya zama santsi, babu ramukan yashi, fashe, aibobi, burrs da sauran lahani waɗanda ke rage ƙarfin flange, kuma ba za a sami ɓarna mai shiga da sauran lahani da ke shafar hatimi a kan sealing surface.
Lokacin hadawaflangesda bututu, yi amfani da flange mai mulki don duba tsaye naflanges. Lokacin daflangeBa a ƙayyade girman bambancin haɗin haɗin kai a cikin ƙirar ba, bai kamata ya zama mafi girma fiye da 1, 5% na diamita na flange ba, kuma ba fiye da 2mm ba, lokacin da flanges biyu ba daidai ba ne kuma sun wuce bukatun ƙayyadaddun dole ne a daidaita su, kar a yi amfani da gaskets da yawa don gyarawa.
Lokacin daflangeana walda shi zuwa bututun, ya kamata a lakafta shi a bangarorin biyu bisa ga ma'auni, kuma tsayin ƙafar walda ya dace da buƙatun.