FLANGE STANDARD DIN, JIS, ANSI, PN, UNI.

1.DIN carbon steel flanges
Material: Rst37.2,St37.2,C22.8)
DIN2573 PN6; DIN2576 PN10, DIN2502 PN16, DIN2503 PN25, PN40,DIN2566 PN10&PN16, DIN2631  PN6, DIN2632 PN10. DIN2633 PN16, DIN2634 PN25, DIN2635 PN40, DIN2636 PN64, DIN2637 PN100, DIN2638 PN160,
2.ANSI B16.5 carbon steel forged flanges,(Material A105,Q235)
150LB,300LB,400LB,600LB,900LB,1500LB,2500LB WNRF,
WNFF,SORF,SOFF,THRF,SWRF,LJRF flanges

3.JISflanges(SS400,SF440A)
5K,10K,16K,20K,30K,40KSOPFF,SOPRF,SOHFF, SOHRF,
BLFF,BLRF,WNRF,WNFF flanges

4.Italyflanges(MaterialRst37.2,S235JRG2,A105)
UNI2276,UNI2277,UNI2278, UNI6084,UNI6089,UNI6090,
UNI2544,UNI2282,UNI6090,UNI6091,UNI6092,UNI6093 flanges

5.EN1092 
PN6,PN10,PN16,PN25,PN40,PN64,PN100,PN160;TYPE01,
TYPE02,TYPE05,TYPE12,TYPE13 Flanges

Piping Class Ratings based on ASME B16.5 and corresponding PN 
(Pression Nominal*)
 Pression Nominal is the French equivalent of Pressure Nominal 
Pression Nominal is the rating designator followed by a designation 
number indicating the approximate pressure rating in bars.
1 bar = 1x105 Pa (N/m2) = 0.1 N/mm2 = 10,197 kp/m2 = 10.20 m H2O = 0.98692 atm = 14.5038 psi (lbf/in2)
PN ratings do not provide a proportional relationship between different PN numbers, whereas class numbers do. 
Class numbers are therefore recommended before PN ratings.
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