The diameter of the cylinder
(m)
minimum thickness
(mm) of
less than 15 (less than 50
feet), 15 to less than 36 (50 to less than 120
feet), 36 to 60 (120 to less than 200 feet)
over 60 (. More than 200
feet), 5 (3 part 16
inch) 6 (1 of 4 inches) 8 (5 of 16 inches), 10 (3-inch section 8).
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