IGF’s Premium Quality FRP Flanges
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Monolithic All Hand Lay-up Construction

All IGF flanges are of Type II construction, Mat plus alternating layers of Mat and Woven. Not Machined: The nozzle necks and backs of IGF flanges are not machined. DuPont SW 12 S 6.7.1.1 says, “Overall machine facing of the back of the hand lay-up flange is not permitted.” 110 mil Corrosion Liner: C-Veil+ 2 Nexus+2 Mat. All VE flanges are double nexus construction. Resin Coating: All bolt holes and spot facing are resin coated.
Dimensions
IGF flange, hub, and neck thicknesses meet or exceed ASME Sec. X, ASME RTP-1, ASTM D3299, and PS 15-69.
Pressure Ratings
Flanges are stocked in 50psi,100psi, and 150psi. All bolt holes and bolt circles are per ANSI B16.5 150 lb. drilling.
Resins
Flanges are stocked in Derakane 411, both MEKP and BPO DMA cure. We also have a large in-ventory of Derakane D470 and ISO flanges. Other resins are available upon request.
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  • Flange Dimensions - Inches
  • 50 PSI
ID Inside Dia
OD Flange Dia
FT Flange Thickness
HT Hub Thickness
HL Hub Length
NT Nozzle Thickness
BC Bolt Circle Dia
BH Bolt Hole Dia
Number of Bolt Holes
SF Spot Face
0.75
4.125
0.5
0.25
2
0.1875
2.75
0.625
4
1.5625
1
4.25
0.5
0.25
2
0.25
3.125
0.625
4
1.5625
1.5
5.5
0.5
0.25
2
0.25
3.875
0.625
4
1.5625
2
6.5
0.5625
0.2813
2.25
0.25
4.75
0.75
4
1.75
2.5
7.5
0.5625
0.2813
2.25
0.25
5.5
0.75
4
1.75
3
8
0.5625
0.2813
2.25
0.25
6
0.75
4
1.75
4
9.5
0.6875
0.3438
2.75
0.25
7.5
0.75
8
1.75
6
11.5
0.6875
0.3438
2.75
0.25
9.5
0.875
8
2
8
14
0.8125
0.4063
3.25
0.3125
11.75
0.875
8
2
10
16.5
0.9375
0.4688
3.75
0.3125
14.25
1
12
2.25
12
19.5
1.0625
0.5313
4.25
0.3125
17
1
12
2.25
14
21
1.0625
0.5625
4.5
0.375
18.75
1.125
12
2.5
16
23.5
1.25
0.625
5
0.375
21.25
1.125
16
2.5
18
25
1.375
0.6875
5.5
0.4375
22.75
1.25
16
2.75
20
27.5
1.5
0.75
6
0.4375
25
1.25
20
2.75
24
32
1.625
0.8125
6.5
0.5
29.5
1.375
20
3
100 PSI
ID Inside Dia
OD Flange Dia
FT Flange Thickness
HT Hub Thickness
HL Hub Length
NT Nozzle Thickness
BC Bolt Circle Dia
BH Bolt Hole Dia
Number of Bolt Holes
SF Spot Face
0.75
4.125
0.5
0.25
2
0.1875
2.75
0.625
4
1.5625
1
4.25
0.5625
0.2813
2.25
0.25
3.125
0.625
4
1.5625
1.5
5.5
0.5625
0.2813
2.25
0.25
3.875
0.625
4
1.5625
2
6.5
0.625
0.3125
2.5
0.25
4.75
0.75
4
1.75
3
8
0.75
0.375
3
0.25
6
0.75
4
1.75
4
9.5
0.875
0.4375
3.5
0.3125
7.5
0.75
8
1.75
6
11.5
0
0.5
4
0.3125
9.5
0.875
8
2
8
14
1.0625
0.5313
4.25
0.375
11.75
0.875
8
2
10
16.5
1.25
0.625
5
0.4375
14.25
1
12
2.25
12
19.5
1.5
0.75
6
0.5
17
1
12
2.25
150 PSI
ID Inside Dia
OD Flange Dia
FT Flange Thickness
HT (Hub Thickness)
HL Hub Length
NT Nozzle Thickness
BC Bolt Circle Dia
BH Bolt Hole Dia
Number of Bolt Holes
SF Spot Face
0.5
3.75
0.625
0.3125
2.5
0.1875
2.375
0.625
4
1.5625
0.75
4.125
0.625
0.3125
2.5
0.1875
2.75
0.625
4
1.5625
1
4.25
0.6875
0.3438
2.75
0.25
3.125
0.625
4
1.5625
1.5
5.5
0.6875
0.3438
2.75
0.25
3.875
0.625
4
1.5625
2
6.5
0.75
0.375
3
0.25
4.75
0.75
4
1.75
2.5
7.5
0.75
0.375
3
0.25
5.5
0.75
4
1.75
3
8
0.875
0.438
3.5
0.222
6
0.75
4
1.75
4
9.5
1
0.5
4
0.3125
7.5
0.75
8
1.75
6
11.5
1.125
0.5625
4.5
0.4375
9.5
0.875
8
2
8
14
1.3125
0.6563
5.25
0.5
11.75
0.875
8
2
10
16.5
1.5
0.75
6
0.5625
14.25
1
12
2.25
12
19.5
1.875
0.9375
7.5
0.4694
17
1
12
2.25
14
21
2
1
8
0.8125
18.75
1.125
12
2.5
16
23.5
2.25
1.125
9
1
21.25
1.125
16
2.5
18
25
2.25
1.125
9
1.0625
22.75
1.25
16
2.594
20
27.5
2.375
1.1875
9.5
1.1875
25
1.25
20
2.594
24
32
2.75
1.375
11
1.4375
29.5
1.375
20
3