FRP Flanges

FRP Blind & Stub Flanges - Fiberglass Pipe Flanges

Industrial Linings, Inc. manufactures several types of FRP flanges including:

  • Integral stub flanges (one piece)
  • Blind flanges
  • Vanstone flanges (with FRP or steel backup rings)
  • “Flange on Pipe” (flange built onto pipe or a fitting such as an elbow or reducer)

Our fiberglass flanges are manufactured using the Hand Lay-up manufacturing method to meet or exceed PS 15-69 and ASTM D5421. All bolts holes of drilled flanges are spot-faced and resin coated. A 150-lb drilling pattern is used in all pressured ratings unless specified otherwise.

Our FRP flanges can be manufactured with the followings PSI ratings:

  • 25 (Duct)
  • 50
  • 75
  • 100
  • 125
  • 150

Fiberlgass Flange Thickness

Pipe Size

Minimum flange thickness at pressure ratings:

25 psi

50 psi

75 psi

100 psi

125 psi

150 psi

inches

Inches

inches

inches

inches

inches

inches

1

1/2

1/2

1/2

9/16

5/8

11/16

1.5

1/2

 

1/2

9/16

5/8

11/16

2

1/2

1/2

1/2

9/16

5/8

11/16

2.5

1/2

1/2

5/8

9/16

3/4

13/16

3

1/2

1/2

5/8

11/16

3/4

13/16

3.5

1/2

9/16

11/16

13/16

7/8

15/16

4

1/2

9/16

11/16

13/16

7/8

15/16

6

1/2

5/8

3/4

7/8

1

1-1/16

8

9/16

3/4

7/8

1

1-1/8

1-1/4

10

11/16

7/8

1-1/16

1-3/16

1-5/16

1-7/16

12

3/4

1

1-1/4

1-7/16

1-5/8

1-3/4

14

13/16

1-1/16

1-5/16

1-1/2

1-3/4

1-7/8

16

7/8

1-3/16

1-7/16

1-5/8

1-7/8

2

18

15/16

1-1/4

1-1/2

1-3/4

2

2-1/4

20

1

1-5/16

1-5/8

1-7/8

2-1/2

2-7/16

24

1-1/8

1-1/2

1-7/8

2-1/4

2-5/8

2-13/16

30

1-3/8

1-7/8

2-3/8

2-5/8

3

3-3/8

36

1-3/4

2-3/16

3-7/8

3

3-1/2

4

42

2

2-3/4

3-3/8

 

 

 


FRP flange

FRP Flange Details

Diameter (D)

Std. Length (H)

Flange OD (J)

Bolt Circle (B.C.)

No. of Holes

Bolt Hole Dia.

Bolt Size Dia.

inches

inches

inches

inches

inches

inches

inches

1

12

4-1/4

3-1/8

4

5/8

1/2

1.5

12

5-1/2

3-7/8

4

5/8

1/2

2

12

6-1/2

4-3/4

4

3/4

5/8

2.5

12

7

5-1/2

4

3/4

5/8

3

12

8

6

4

3/4

5/8

3.5

12

9

7

8

3/4

5/8

4

12

9-1/2

7-1/2

8

3/4

5/8

6

12

11-1/2

9-1/2

8

7/8

3/4

8

12

14

11-3/4

8

7/8

3/4

10

12

16-1/2

14-1/4

12

1

7/8

12

12

19-1/2

17

12

1

7/8

14

12

21-1/2

18-3/4

12

1-1/8

1

16

12

24

21-1/4

16

1-1/8

1

18

12

25-1/2

22-3/4

16

1-1/4

1-1/8

20

12

28

25

20

1-1/4

1-1/8

24

12

32-1/2

29-1/4

20

1-3/8

1-1/4

30

12

38-3/4

36

28

1-3/8

1-1/4

36

12

46

42-3/4

32

1-5/8

1-1/2

42

12

53

49-1/2

36

1-5/8

1-1/2

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