GB/T 1047-2005 "Pipeline Cheebtsam DN (Kev txhais thiab Kev Xaiv ntawm Nominal Dimensions)" txhais raws li hauv qab no:
Qhov loj me nominal yog ib qho alphanumeric dimensional designation siv rau piping system Cheebtsam, uas muaj cov ntawv DN ua raws li ib tug dimensionless integer tooj. Tus lej no ncaj qha ntsig txog qhov ntev ntawm tus yam ntxwv xws li lub qhov taub lossis lub taub sab nraud (qhia hauv mm) ntawm qhov kawg txuas.
Qhov nominal loj DN yog ib tug yooj yim rounded tooj rau siv lub hom phiaj. Tshwj tsis yog tias tau teev tseg, tus lej tom qab DN tsis sawv cev rau kev ntsuas thiab tsis siv rau kev suav. Lwm cov txheej txheem kev siv DN yuav tsum muab kev sib raug zoo ntawm DN thiab qhov loj ntawm cov yeeb nkab, xws li DN / OD lossis DN / ID.
1 hauv =25.4mm
1 xaim =0.01mm
