某管道(dao)材(cai)料為(wei)(wei)(wei)20#鋼(gang):蒸汽設計(ji)壓力為(wei)(wei)(wei)1.6MPa,設計(ji)溫度為(wei)(wei)(wei)330°C;蒸汽設計(ji)壓力為(wei)(wei)(wei)2.6MPa,設計(ji)溫度為(wei)(wei)(wei)260℃。管道(dao)等級的最(zui)小壓力級別為(wei)(wei)(wei)4.0MPa。法蘭、墊片可(ke)以為(wei)(wei)(wei)以下組合形式:
HG法蘭:①. PN4.0 WN-MFM;墊(dian)片:PN4.0帶(dai)內環(huan)纏繞墊(dian)。②. PN4.0 WN-MFM;墊(dian)片:PN4.0柔(rou)性石墨復合墊(dian)。
GB法蘭:①. PN4.0 WN-MF;墊(dian)(dian)片(pian)(pian):PN4.0帶內環纏繞(rao)(rao)墊(dian)(dian)。②. PN4.0 SO-RF;墊(dian)(dian)片(pian)(pian):PN4.0帶外(wai)環纏繞(rao)(rao)墊(dian)(dian)。
JB法(fa)蘭:PN4.0WN-MFM;墊(dian)片:PN4.0帶(dai)內環纏(chan)繞墊(dian)。