法兰制造标准：
美标：ANSI B16.5,ANSMSS SP-44
日标：JISB2220,
欧标：EN1092.1,BS1560,BS4504,
德标：DIN2502，DIN2503，DIN2527，DIN2565，DIN2566，DIN2573，DIN2576，DIN2627
俄标：GOST12821,GOST12820
国标：GBGB13402，SH3406，HGHGJB74-90
法兰尺寸：
DN15,DN20,DN25,DN32,DN40,DN50,DN65,DN80,DN90,DN100,DN125,DN150,DN200,DN250,DN300,DN350,DN400,DN450,DN500,DN550,DN600,DN650,DN700,DN750,DN800,DN850,DN900,DN950,DN1000,DN1200,DN2000
1，2",3，4",1"quotquot;,2"quot;,3"quot;,4",5",6",8",10",12",14",16",18",20",22",22",24",26",28",30",32",34",36",38",40",42",44",46",48"50",60",72"
&PhPhPhPhi;355.6
