A cikin AWWA C207-07, Class E hub flanges takamaiman nau'in flange ne da aka tsara don amfani da tsarin samar da ruwa. Ƙungiyar Ayyukan Ruwa na Amurka (AWWA) ta kafa ƙa'idodi don flanges na bututun ƙarfe da ake amfani da su a cikin tsarin aikin ruwa, kuma flanges na Class E suna cikin wannan ma'auni.
An tsara flanges na Class E don aikace-aikace tare da matsananciyar aiki idan aka kwatanta da flanges Class D. Ana amfani da waɗannan flanges yawanci a cikin masana'antar sarrafa ruwa, wuraren sharar gida, da cibiyoyin samar da ruwa na birni inda buƙatun matsin ya fi tsauri.
A AWWA C207-07, Class E hub flanges an rarraba su bisa ma'aunin matsi kuma an ƙera su don biyan takamaiman buƙatun ƙira. Ma'auni yana ƙayyadad da nau'o'i daban-daban kamar diamita na flange, diamita na rami, diamita da'irar, ma'auni, girman fuska, da ƙayyadaddun kauri don flanges Class E.
Class E cibiya flanges yawanci ƙirƙira daga kayan kamar carbon karfe ko bakin karfe don tabbatar da dorewa da lalata juriya a aikace-aikace na ruwa. Cibiyar da aka tashe a tsakiyar flange tana ba da ƙarin ƙarfi da tallafi lokacin haɗawa da bututu ko bawuloli.
Abubuwan da aka bayyana a cikin AWWA C207-07 Table 4 don Class E hub flanges suna tabbatar da cewa flanges sun dace da buƙatun buƙatun aikace-aikacen ruwa da kuma samar da ingantaccen haɗin kai, wanda ba shi da ruwa a cikin tsarin rarraba ruwa mai ƙarfi.
A taƙaice, flanges na Class E da aka ayyana a cikin AWWA C207-07 Tebura 4 suna taka muhimmiyar rawa a cikin tsarin samar da ruwa, yana ba da amintaccen haɗin kai don samar da kayan aikin bututu a wuraren kula da ruwa, masana'antar sarrafa ruwan sha, da cibiyoyin rarraba ruwa na birni.
