American standard :
ASTM ANSI BI6.5,ASA,API-605,AWWA-c207,MSS-sp44
Kind of flange : slip-on, welding nack, blind, threaded, lap-joint,socket-welding etc.
Class of pressure :Class 150,300,600,900,1500.
Size:1/2?-------24?
JIS standard
JIS 5K,10K,16K,20K ETC.
Kind of flange :plate, slip-on, blind etc.
Size :1/2?----24?
German standard
DIN2573,2572,2631,2632,2633,2543,2544,2634,2545 etc.
Kind of flange : plate, slip-on, welding neck, blind threaded etc.
Size :1/2?----24?
Brithsh standard
BS4504 NP16,NP25,NP40,BS10 TABLE E,BS10 TABLED,etc.
Kind of flange :plate, walding nack , etc.
Size:1/2?-----24?
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