Biyu mai mahimmanci biyu masu mahimmanci, kamar su flanges marasa walwala da flanges masu flanges, ana yawanci amfani dasu sosai a cikin tsarin bututu. Sharuɗɗan "B16.5" ko "B16 5" ana amfani da su ba da izini kuma suna magana da daidaitaccen ɗaya. Koyaya, daidaitaccen asme B16 5 (Anssi B16 5) kawai suna yin girman girman girman har zuwa 24 inci. For larger sizes, the ASME B16.47 standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking and testing for NPS 26 to NPS 60 size pipe flanges and is available in classes 75, 150, 300, 400, 600 and 900.