I-AWWA C207-07 iyindinganiso eshicilelwe yi-American Water Works Association (AWWA) ecacisa ubukhulu, ukubekezelelana, nezinto zokwakha zamapayipi ensimbi asetshenziswa ezinhlelweni zokusebenza kwamanzi. Ama-flange wehabhu ye-Class D aklanyelwe ukusetshenziswa okumaphakathi kuya kokucindezela okukhulu kumasistimu okusabalalisa amanzi.
Ama-hub flange e-Class D ahlukaniswa ngokusekelwe ezilinganisweni zawo zengcindezi futhi ngokuvamile asetshenziswa ezikhungweni zokuhlanza amanzi, izikhungo zamanzi angcolile, kanye namanethiwekhi kamasipala okuphakelwa kwamanzi. Lawa ma-flange aklanyelwe ukuhlinzeka ngoxhumano oluqinile noluvikelekile phakathi kwamapayipi, ama-valve, nokufakwa kwezinhlelo zokusebenza zamanzi.
Ku-AWWA C207-07, ama-flange ehabhu Yekilasi D acaciswa ngokususelwe kubukhulu obuhlukahlukene, okuhlanganisa ububanzi be-flange, ububanzi bembobo yebhawodi, ububanzi bendilinga yebhawodi, ubukhulu behabhu, ubukhulu obubhekene, nokucaciswa kogqinsi. Lezi zici ziqinisekisa ukuthi ama-flange ahlangabezana nezindinganiso ezidingekayo futhi anikeze ukuqondana okufanele nokuvala lapho exhunywe kumasistimu amapayipi.
Ama-flange ehabhu lekilasi D ngokuvamile akhiqizwa ngezinto ezifana nensimbi ye-carbon steel noma insimbi engagqwali ukuze kuqinisekiswe ukuqina nokumelana nokugqwala ekusetshenzisweni kwamanzi. Ihabhu eliphakanyisiwe phakathi nendawo ye-flange linikeza amandla engeziwe kanye nokwesekwa lapho uxhumeka kumapayipi noma ama-valve.
Sekukonke, ama-hub flange e-AWWA C207-07 Class D ayizingxenye ezibalulekile ezinhlelweni zokusabalalisa amanzi, eziletha ukuxhuma okuthembekile nokungavuziyo kwengqalasizinda yamapayipi ezindaweni zokuhlanza amanzi kanye namanethiwekhi okuphakelwa kwamanzi kamasipala.
