Pipe Selection Criteria & Properties

Question 1

HEL-COR (2 2/3’ x 1/2’)

Answer 1

Diameter Range (inches): 12’ - 60’

Materials:

• Galvanized Steel
• Aluminized Steel
• Aluminum
• Polymer Coated Steel

Manning’s “n”: 0.12 - .020

Standard Lengths (feet) : 20’ - 40’

Minimum Cover (inches) : 12’ or Span/8

Question 2

HEL-COR (5’ x 1’)

Answer 2

Diameter Range (inches): 48’ - 144’

Materials:

• Galvanized Steel
• Aluminized Steel
• Aluminum
• Polymer Coated Steel

Manning’s “n”: 0.022 - .025

Standard Lengths (feet) : 20’ - 40’

Minimum Cover (inches) : 12’ or Span/8

Question 3

HEL-COR (3’ x 1’)

Answer 3

Diameter Range (inches): 48’ - 144’

Materials:

• Galvanized Steel
• Aluminized Steel
• Aluminum
• Polymer Coated Steel

Manning’s “n”: 0.022 - .027

Standard Lengths (feet) : 20’ - 40’

Minimum Cover (inches) : 12’ or Span/8

Question 4

ULTRA-FLOW Spiral Rib (3/4’ x 3/4’ x 7 1/2’)

Answer 4

Diameter Range (inches): 48’ - 120’

Materials:

• Galvanized Steel
• Aluminized Steel
• Aluminum
• Polymer Coated Steel

Manning’s “n”: 0.012

Standard Lengths (feet) : 20’ - 40’

Minimum Cover (inches) : 12’ or Span/8

Question 5

Smooth Cor Double Wall (3’ x 1’ Shell) (2 2/3’ x 1/2’ Shell Smooth Liner)

Answer 5

Diameter Range (inches): 18’ - 144’

Materials:

• Aluminized Steel
• Polymer Coated Steel

Manning’s “n”: 0.012

Standard Lengths (feet) : 20’ - 40’

Minimum Cover (inches) : 12’ or Span/8

Question 6

CORLIX (2 2/3’ x 1/2’)

Answer 6

Diameter Range (inches): 12’ - 72’

Materials:

-Aluminum

Manning’s “n”: 0.010 - 0.021

Standard Lengths (feet) : 20’ - 40’

Minimum Cover (inches) : 12’ or Span/8

Question 7

CORLIX (3’ x 1’)

Answer 7

Diameter Range (inches): 30’ - 120’

Materials:

-Aluminum

Manning’s “n”: 0.019 - 0.022

Standard Lengths (feet) : 20’ - 40’

Minimum Cover (inches) : 12’ or Span/8