Figure: 43 TAC 21.910(c)(4)(E)

Nominal Diameter
(inches)

Min. Thickness for Coated (inches)

Non-Coated
(inches)

14 and under

0.188

0.188

16

0.219

0.281

18

0.250

0.312

20 and 22

0.281

0.344

24

0.312

0.375

26

0.344

0.406

28

0.375

0.438

30

0.406

0.469

32

0.438

0.500

34 and 36

0.469

0.531

38, 40 and 42

0.500

0.563

44 and 46

0.531

0.594

48

0.563

0.625

50

0.594

0.656

52

0.625

0.688

54

0.656

0.719

56 and 58

0.688

0.750

60

0.719

0.781

62

0.750

0.813

64

0.718

0.844

66 and 68

0.813

0.875

70

0.844

0.906

72

0.875

0.938