Gulu 2 la AWWA C207-18 limapereka zowunikira za Class D ring flanges. AWWA C207-18 ndi muyezo wofalitsidwa ndi American Water Works Association (AWWA) womwe umafotokoza kukula ndi kulolerana kwa ma flanges achitsulo omwe amagwiritsidwa ntchito m'makina opangira madzi.
Ma Flanges a mphete a Class D adapangidwa kuti azigwiritsidwa ntchito ndi chitoliro chachitsulo pazantchito zolimba mpaka zolimba. Ma flanges awa nthawi zambiri amagwiritsidwa ntchito m'madzi ndi madzi oyipa pomwe zokakamiza zogwirira ntchito zimakhala zapamwamba kuposa za Class B flanges.
Table 2 imatchula miyeso yosiyanasiyana ya ma flange a Class D monga mabwalo ozungulira a bawuti, kuchuluka kwa mabowo a bolt, bowo la bolt, makulidwe a flange, kutalika kwa hub, ndi miyeso yoyang'ana. Izi zimatsimikizira kuti ma flanges amapangidwa molingana ndi miyezo yofunikira ndikutsimikizira kulumikizidwa koyenera ndi kusindikiza akalumikizidwa ndi mapaipi.
Mitundu ya mphete ya Class D nthawi zambiri imapangidwa kuchokera ku chitsulo cha kaboni kapena chitsulo chosapanga dzimbiri ndipo imatha kupirira zovuta zogwirira ntchito zamakina ogawa madzi. Ma flanges adapangidwa kuti apereke kulumikizana kodalirika komanso kopanda kutayikira pakati pa mapaipi, mavavu, ndi zomangira pakugwiritsa ntchito madzi.
Mwachidule, Class D ring flanges monga momwe tafotokozera mu Table 2 ya AWWA C207-18 ndi zigawo zofunika kwambiri pamakina ogawa madzi, zomwe zimapereka kulumikizana kolimba komanso kotetezeka kwa zida zamapaipi m'mafakitale opangira madzi, malo otayira madzi, ndi ma network operekera madzi amtawuni.
