Ithebula lesi-2 le-AWWA C207-18 lihlinzeka ngezicaciso ze-Class D ring flange. I-AWWA C207-18 iyindinganiso eshicilelwe yi-American Water Works Association (AWWA) echaza ubukhulu nokubekezelelwa kwama-flange amapayipi ensimbi asetshenziswa ezinhlelweni zokusebenza kwamanzi.
I-Class D ring flange yakhelwe ukusetshenziswa nepayipi lensimbi ngamasevisi anezingcindezi ezimaphakathi kuya phezulu. Lawa ma-flange ngokuvamile asetshenziswa emanzini nasemanzini angcolile lapho izingcindezi zokusebenza ziphakeme kunalezo ze-Class B flange.
Ithebula lesi-2 licacisa izilinganiso ezihlukahlukene zama-flange Ekilasi D njengobubanzi bendilinga yebhawodi, inombolo yezimbobo zebhawodi, ububanzi bembobo yebhawodi, ukujiya kwe-flange, ubude behabhu, nobukhulu obubheke. Lezi zici ziqinisekisa ukuthi ama-flange akhiqizwa ngokwezindinganiso ezidingekayo futhi aqinisekisa ukuqondanisa okufanele nokuvala lapho exhunywe kumapayipi amapayipi.
I-Class D ring flanges ngokuvamile ikhiqizwa nge-carbon steel noma insimbi engagqwali futhi iyakwazi ukumelana nezingcindezi eziphezulu zokusebenza zezinhlelo zokusabalalisa amanzi. Ama-flange aklanyelwe ukuhlinzeka ngoxhumano oluthembekile nolungavuziyo phakathi kwamapayipi, ama-valve, nokufakwa kwezinhlelo zokusebenza zamanzi.
Kafushane, izindandatho ze-Class D njengoba zicaciswe kuThebula 2 le-AWWA C207-18 ziyizingxenye ezibalulekile ezinhlelweni zokusabalalisa amanzi, ezihlinzeka ngoxhumano oluqinile noluvikelekile lwengqalasizinda yamapayipi ezindaweni zokuhlanza amanzi, izinsiza zamanzi angcolile, kanye namanethiwekhi okuphakelwa kwamanzi kamasipala.
