TPEP lalata-magance karfe bututun yana nufin karfe bututun da aka tsara ta hanyar lalata-magance tsari, wanda zai iya tasiri hana ko rage lalata halin da ke faruwa a lokacin sufuri da kuma amfani da sinadarai ko lantarki. Anti lalata spiral karfe bututun zai iya inganci hana ko rage lalata tsawaita karfe bututun aiki rayuwa, rage karfe bututun aiki kudin.

Nominal diamita na tpep lalacewa madaidaiciya karfe bututu:

Ana iya raba diamita na karfe bututun mai haɗuwa da lalacewa zuwa waje diamita, ciki diamita, da kuma nominal diamita. The bututun da aka yi amfani da haruffa D don nuna diamita na bututun da aka yi amfani da shi, da kuma girman da kauri na bangon da aka ƙara da diamita na waje, misali diamita na bututun da aka yi amfani da shi da shi da shi ne 108, da kauri na bangon da shi ne 5MM, da aka yi amfani da D108 * 5, bututun roba kuma ya yi amfani da diamita na waje, kamar De63, sauran abubuwa kamar ƙarfe mai ƙarfe, bututun ƙarfe, bututun ƙarfe, bututun galvanized, da sauransu suna amfani da DN, a cikin zane-zane gabaɗaya ana amfani da nominal diamita don nuna, nominal diamita ita ce daidaitattun da aka tsara don tsara masana'antu da The nominal diamita na bututu da ciki diamita, waje diamita ba daidai ba ne, misali: da nominal diamita ne 100MM na madaidaicin karfe bututu post 102 * 5, 108 * 5 da sauransu nau'ikan da dama, 108 ne bututun waje diamita, 5 ya nuna bututun bango kauri, saboda haka, da karfe bututun ciki diamita ne (108 * 5-5) = 98MM, amma shi ba daidai da karfe bututun waje diamita rage sau biyu bango kauri bambanci, kuma za a iya ce, da nominal diamita ne kusa da ciki diamita, amma ba daidai da ciki diamita daya na bututun diamita bayanin kula sunan, a zane zane don haka don amfani da nominal diamita, manufar shi ne don bisa ga nominal diamita za a iya ƙayyade bututun, bututun kayan aiki, bawul, flange, gasket da sauran tsarin girman da haɗin girman, da nominal diamita ta amfani da alamar DN nuna, idan a zane zane ta amfani da waje diamita nuna, kuma ya kamata a yi bututun bayanin kula