Flat Face Flanges

The Flat Face flange has a gasket surface in the same plane as the bolting circle face. Applications using flat face flanges are frequently those in which the mating flange or flanged fitting is made from a casting.

Flat face flanges are never to be bolted to a raised face flange. ASME B31.1 says that when connecting flat face cast iron flanges to carbon steel flanges, the raised face on the carbon steel flange must be removed, and that a full face gasket is required. This is to keep the thin, bittle cast iron flange from being sprung into the gap caused by the raised face of the carbon steel flange.

We are Manufacturer, Supplier and Exporter of ASME 16.5 Flat Flanges. Our flat flanges sit flat on the ground and have a neck. The flat face (full face) flange has a gasket surface in the same plane as the bolting circle face.  

Raised Face Flanges
RTJ Face Flanges
Flat Face Flanges
Forging flange standard series
American Standard Series
STANDARD CODESNOMINAL SIZEPRESSURE GRADE
                  ANSI B 16.5(88)1/2″-24″   Class 150、300、600、900、1500、2500
                  ANSI B 16.47(90)26″-60″   Class 150、300、600、900
                  ASME B 16.5(96)1/2″-24″   Class 150、300、600、900、1500、2500
                  ISO7005-1(92)1/2″-24″   PN2.0 5.0 11.0 15.0 26.0 42.0
                  BS4504-3.1(89)1/2″-24″   Class 150、300、600、900、1500、2500
                  JPI 7S-15-931/2″-24″   Class 150、300、600、900、1500、2500
                  NF E29-2031/2″-24″   PN2.0 5.0 11.0 15.0 26.0 42.0
                  API605-8126″-60″   Class 150、300、600
                  ASME B 16.36(96)1″-24″   Class 300、400、600、900、1500、2500
 German Standard Series
STANDARD CODESNOMINAL SIZEPRESSURE GRADE
DIN 2630 WNDN1200-DN24001 Bar
DIN 2631 WNDN10-DN36006 Bar
DIN 2632 WNDN200-DN300010 Bar
DIN 2633 WNDN10-DN200016 Bar
DIN 2634 WNDN200-DN100025 Bar
DIN 2635 WNDN10-DN50040 Bar
DIN 2636 WNDN10-DN40064 Bar
DIN 2637 WNDN10-DN350100 Bar
DIN 2638 WNDN10-DN300160 Bar
DIN 2573 PLDN10-DN5006 Bar
DIN 2576 PLDN10-DN50010 Bar
DIN 2527 PLDN10-DN5006 10 16 25 40 Bar
DIN 2501 WNDN15-DN50010 16 25 40 63 100 160 250 320 400 Bar
DIN 2566 THDN15-DN50010 16 Bar
DIN 2655 PLDN15-DN5000.25 0.6 1.0 1.6 2.5 4.0 Bar
DIN 2656 PLDN15-DN5000.25 0.6 1.0 1.6 2.5 4.0 Bar
 Japanese Standard Series
STANDARD CODESNOMINAL SIZEPRESSURE GRADE
JIS B 2220 PLDN10-DN4005K
JIS B 2220 SODN450-DN10005K
JIS B 2220 PLDN10-DN22510K
JIS 2220 SODN250-DN100010K 
JIS 2220 SODN10-DN120016K 20K 30K
JIS 2220 WNDN15-DN40030K
 National Standard Series
STANDARD CODESNOMINAL SIZEPRESSURE GRADE
GB/T 9112-9113.4-2000DN10-DN2000PN 0.25 0.6 1.0 2.5 4.0 6.3 10.0 16.0 Mpa
JB/T 74-86.2-94DN10-DN1600PN 0.25 0.6 1.0 2.5 4.0 6.3 10.0 16.0 20.0 Mpa
HG 20592-20626-97DN10-DN2000PN 0.25 0.6 1.0 2.0 2.5 4.0 5.0 6.3 10.0 11.0 15.0  16.0 25.0 26.0 42.0 Mpa
SH 3406-96DN10-DN1500PN 1.0 2.0 5.0 6.8 10.0 15.0 25.0 42.0 Mpa
GB/T 17241.1-17241.7DN10-DN4000PN 0.25 0.6 1.0 1.6 2.0 2.5 4.0 5.0 Mpa
GB/T 15530.1-15530.8DN10-DN1800PN 0.6 1.0 1.6 2.0 2.5 4.0 5.0 Mpa
 Power Ministry Series
STANDARD CODESNOMINAL SIZEPRESSURE GRADE
D-GD86-0510-0537DN15-DN2000PN 0.25 0.6 1.0 1.6 2.5 4.0 6.4 10.0 Mpa
DG0511-0541DN15-DN1000PN 0.25 0.6 1.0 1.6 2.5 4.0 6.4 10.0 20.0 32.0 Mpa
 Pressure Vessel Series
STANDARD CODESNOMINAL SIZEPRESSURE GRADE
JB/T 4701-2000DN300-DN2000PN 0.25 0.6 1.0 1.6 10.0 Mpa
JB/T 4702-2000DN300-DN3000PN 0.25 0.6 1.0 1.6 2.5 4.0 Mpa
JB/T 4703-2000DN300-DN2000PN 0.6 1.0 1.6 2.5 4.0 6.4 Mpa
 Shipping Series
STANDARD CODESNOMINAL SIZEPRESSURE GRADE
GB573-581-76DN20-DN500PN 0.6 1.0 1.6 2.5 4.0 6.4 Mpa
GB2506-2507-89DN10-DN2000PN 0.25 0.6 1.0 1.6 2.5 Mpa
GB4450-84DN20-DN500PN 0.6 1.0 1.6 Mpa
GB10746-10749-89DN10-DN600PN 0.6 1.0 1.6 2.5 4.0 6.4 Mpa