Fiberglass (FRP) Pipe & Duct Fabrication

Fiberglass Pipe Manufacturer - FRP Duct Design & Fabrication

FRP Pipe and DuctIndustrial Linings, Inc. can design and manufacture fiberglass ducts, air ducts, and pipes ranging from 1” to 72” diameter. Our chemical resistant piping can be manufactured using various manufacturing methods including:

  • Hand Lay-up
  • Filament wound
  • Dual Laminate

We have been manufacturing fiberglass ducts and pipes for over 35 years to a broad range of industries including chemical processing, pulp & paper, wastewater facilities and energy facilities. Our FRP pipe and duct product lines are designed to meet or exceed accepted industry standards and various pressure ratings per:

  • ASTM D3299 (Filament Wound)
  • ASTM D4097 (Contact Molded)
  • ASME RTP-1
  • NBS PS 15-69

Electrically Conductive FRP Pipe and Duct 

There are some cases where the flow of an explosive gas can create a static charge in fiberglass duct or piping systems. This charge must be bled off to ground. With the development of carbon veil by glass manufacturers, this can now be achieved. The combination of carbon veil, the excellent corrosion resistance of polyester and vinyl ester resins, and conductive connection devices will allow the electric current to flow between pipe sections and lead it to ground. This can be especially useful in the pharmaceutical industry.

Abrasion Resistant FRP Pipe and Duct

Fine particles of silicon carbide, combined with polyester or vinyl ester resin, can be integrated into the corrosion barrier of FRP pipe and duct to handle abrasive slurries. This procedure can be incorporated into new fabrications, as well as existing products. With the proven corrosion resistance of polyester and vinyl ester resin, along with the addition of silicon carbide, we can more effectively handle any abrasion problem.

Filament Wound Pipe Construction

  • INNER SURFACE: Surfacing Veil (90% Resin; 10% Glass) 0.01-0.02 thick
  • INTERIOR LAYER: Chopped Strand Mat (70% Resin; 30% Glass)
  • STRUCTURAL LAYER: Continuous Filament Wound (25% Resin; 75% Glass)
  • EXTERIOR SURFACE: Gel Coat and "C" Glass

Contact Molded Pipe Construction

  • INNER SURFACE: Surfacing Veil (90% Resin; 10% Glass) 0.01-0.02 thick
  • INTERIOR LAYER: Chopped Strand Mat (70% Resin; 30% Glass)
  • STRUCTURAL LAYER: Alternate Woven Roving & Chopped Strand (55% Resin; 45% Glass)
  • EXTERIOR SURFACE: Gel Coat and "C" Glass

Fiberglass Pipe Wall Thickness

Pipe Size

Minimum pipe wall thickness1 at pressure ratings:

25 psi

50 psi

75 psi

100 psi

125 psi

150 psi

inches

inches

inches

inches

inches

inches

inches

2

3/16

3/16

3/16

3/16

3/16

3/16

3

3/16

3/16

3/16

3/16

1/4

1/4

4

3/16

3/16

3/16

1/4

1/4

1/4

6

3/16

3/16

1/4

1/4

5/16

3/8

8

3/16

1/4

1/4

5/16

3/8

7/16

10

3/16

1/4

5/16

3/8

7/16

1/2

12

3/16

1/4

3/8

7/16

1/2

5/8

14

1/4

5/16

3/8

1/2

5/8

3/4

16

1/4

5/16

7/16

9/16

11/16

 

18

1/4

3/8

1/2

5/8

3/4

 

20

1/4

3/8

1/2

11/16

 

 

24

1/4

7/16

5/8

13/16

 

 

30

5/16

1/2

3/4

 

 

 

36

3/8

5/8

 

 

 

 

42

3/8

3/4

 

 

 

 

1The specified wall thicknesses are based upon a 10 to 1 safety factor. These rating are suitable for use up to 180°F (82.2°C); for ratings at higher temperatures, please contact us.

Fiberglass (FRP) Duct Dimensions

I.D.

(inches)

Wall Thickness (Min.) (inches)

 

Allowable Vacuum2 (inches of water)

Allowable Pressure2 (inches of water)

Flange Diameter (O.D.) (inches)

Flange Thickness (inches)

Bolt Circle Diameter (inches)

Bolt Hole Diameter (inches)

No. of Bolt Holes

2

0.125

405

750

6-3/8

1/4

5

7/16

4

3

0.125

405

500

7-3/8

1/4

6

7/16

4

4

0.125

210

410

8-3/8

1/4

7

7/16

4

6

0.125

64

350

10-3/8

1/4

9

7/16

8

8

0.125

30

180

12-3/8

1/4

11

7/16

8

10

0.125

16

340

14-3/8

3/8

13

7/16

12

12

0.125

9

280

16-3/8

3/8

15

7/16

12

14

0.125

7

220

18-3/8

3/8

17

7/16

12

16

0.125

6

290

20-3/8

1/2

19

7/16

16

18

0.125

5

240

22-3/8

1/2

21

7/16

16

20

0.125

5

190

24-3/8

1/2

23

7/16

20

24

0.187

9

140

28-3/8

1/2

27

7/16

20

30

0.187

7

100

34-3/8

1/2

33

7/16

28

36

0.187

5

70

40-3/8

1/2

39

7/16

32

42

0.250

10

120

46-3/8

5/8

45

7/16

36

48

0.250

9

100

54-3/8

5/8

52

9/16

44

60

0.250

7

80

60-3/8

5/8

58

9/16

44

54

0.250

6

60

66-3/8

5/8

64

9/16

52

1The specified wall thicknesses are based upon a 5 to 1 safety factor. These rating are suitable for use up to 180°F (82.2°C) in pressure service and ambient atmospheric temperatures on vacuum service; for ratings at higher temperatures, please contact us.

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