707.12 Corrugated Steel Spiral Rib Conduits

1. Specifications:

707.12 C&MS.

S 1019

2. Sampling and/or Inspection Requirements:

All pipe and coupling bands shall be inspected after delivery to the project for condition, coating, workmanship and quantity. Coupling bands will meet 707.01. Pipe dimensions shall be checked against the Addendum in section 4. (Field)

Seam fabrication will be a lock seam type formed midway between pipe ribs.

Individual pieces may be rejected for the following items of faulty workmanship:

Uneven laps

Elliptical shaping

Variation from straight centerline

Ragged or diagonal sheared edges

Loose, unevenly lined or spaced rivets or spot welds

Improperly constructed lock seams

Improperly cut or badly burred ends

Lack of rigidity

Improper coating thickness

Dents or bends in the metal

Markings may not be visible due to being covered by coating.

Certification Program:

Metal Pipe certified in accordance with Supplement 1019: for a list of manufacturers conforming with this supplement's requirements visit OMM website at


Certified materials will be shipped using the TE-24 electronic documentation system. A bill of lading defining individual components incorporated in the construction item shall accompany the shipment in addition to a copy of the TE-24.

No samples are required of materials delivered to the project site. Random samples may be obtained by ODOT/OMM Quality Assurance Inspectors at the discretion of the Office of Materials Management (OMM).

3. Methods of Tests:

(OMM) - Metal Pipe portion

AASHTO T 65, T 213: ASTM A 90, A 370.


ASTM A849 for mortar. No test can be performed after fabrication on the mortar strength

AASHTO M190 Type D

4. Addendum:

Rib spacing, depth and width

nominal spacing Maximum spacing Depth (min) Width (min)
7" (190 mm) 7.75" (197 mm) 0.75" (19 mm) .67" (17 mm)
11.5" (292 mm) 11.75" (298 mm) .95" (24 mm) .67" (17 mm)
Spiral Dimensions


Wall thickness in (mm)
18(450) .064 (1.63)
21(525) .064 (1.63)
24(600) .064 (1.63)
30(750) .064 (1.63)
36(900) .064 (1.63)
42(1050) .064 (1.63)
48(1200) .064 (1.63)
54(1350) .079 (2.01)
60(1500) .079 (2.01)
66(1650) .109 (2.77)
72(1800) .109 (2.77)
78(1950) .109 (2.77)

Coating: Aluminum coated sheet

Average both sides - 1.0 oz/ft2 (300 g/m2) Single spot 0.9 oz/ft2 (270 g/m2)