MDOT Table 909-9 Wall Thickness Requirements in Millimeters, Based on Diameter, Class of Pipe and Size of Corrugation.*

Diameter of Pipe		Class 1 (0 to 3 m Cover)			Class 2 (3 to 5 m Cover)			Class 3 (5 to 7 m Cover)			Class 4 (7 to 10 m Cover)
		Size of Corrugation (in. & mm)			Size of Corrugation (in. & mm)			Size of Corrugation (in. & mm)			Size of Corrugation (in. & mm)
mm	in	2 2/3 x 1/2 68 x 13	3 x 1 76 x 25	5 x 1 125 x 25	2 2/3 x 1/2 68 x 13	3 x 1 76 x 25	5 x 1 125 x 25	2 2/3 x 1/2 68 x 13	3 x 1 76 x 25	5 x 1 125 x 25	2 2/3 x 1/2 68 x 13	3 x 1 76 x 25	5 x 1 125 x 25
300	12"	2.77	-	-	2.77	-	-	2.77	-	-	2.77	-	-
375	15"	2.77	-	-	2.77	-	-	2.77	-	-	2.77	-	-
450	18"	2.77	-	-	2.77	-	-	2.77	-	-	2.77	-	-
525	21"	2.77	-	-	2.77	-	-	2.77	-	-	2.77	-	-
600	24"	2.77	-	-	2.77	-	-	2.77	-	-	2.77	-	-
750	30"	2.77	-	-	2.77	-	-	2.77	-	-	2.77	-	-
900	36"	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77
1050	42"	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77
1200	48"	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77
1350	54"	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77
1500	60"	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77	2.77
1650	66"	3.51	2.77	2.77	3.51	2.77	2.77	3.51	2.77	2.77	3.51	2.77	2.77
1800	72"	3.51	2.77	2.77	3.51	2.77	2.77	3.51	2.77	2.77	3.51	2.77	2.77
1950	78"	4.27	2.77	2.77	4.27	2.77	2.77	4.27	2.77	2.77	4.27	2.77	2.77
2100	84"	4.27	2.77	2.77	4.27	2.77	2.77	4.27	2.77	2.77	4.27	2.77	2.77
2250	90"	-	2.77	2.77	-	2.77	2.77	-	2.77	2.77	-	2.77	2.77
2400	96"	-	2.77	2.77	-	2.77	2.77	-	2.77	2.77	-	2.77	2.77
2550	102"	-	2.77	2.77	-	2.77	2.77	-	2.77	2.77	-	2.77	2.77
2700	108"	-	2.77	2.77	-	2.77	2.77	-	2.77	2.77	-	2.77(1)	2.77
2850	114"	-	2.77	2.77	-	2.77	2.77	-	2.77	2.77	-	2.77(1)	2.77
3000	120"	-	2.77	2.77	-	2.77	2.77	-	2.77	2.77	-	2.77(1)	2.77
3150	126"	-	3.51	3.51	-	3.51	3.51	-	3.51	3.51	-	3.51	3.51
3300	132"	-	3.51	3.51	-	3.51	3.51	-	3.51	3.51	-	3.51(1)	3.51
3450	138"	-	3.51	3.51	-	3.51	3.51	-	3.51	3.51	-	3.51(1)	3.51
3600	144"	-	4.27	4.27	-	4.27	4.27	-	4.27	4.27	-	4.27(3)	4.27

(1)	Increase the wall thinckness by one gage for riveted longitudinal seams.
(2)	Increase the wall thickness by two gages for riveted longitudinal seams.
(3)	Denotes Not Allowed for riveted longitudinal seams.
	Riveted seams will not be permitted for 123mm x 25 mm corrugations.
	*For pipe-arch shape corrugated steel pipe, use the gage requirement for the circular pipe equal to or next larger than the span of the pipe-arch.

Home | About Us | Products | Contacts / Locations | News & Events

Success Stories | Contractor's Toolbox | Customer Services

Questions or comments? Please email our webadmin
© Copyright 2008 The Premarc Corporation - All Rights Reserved