****THIS IS A NEW IM. – PLEASE READ CAREFULLY.****

 

TRENCHLESS STEEL CASING AND/OR CARRIER PIPE


 

GENERAL

This IM is intended to provide details for trenchless steel pipe construction.

 

Acceptance for incorporation into a project shall be from an approved steel pipe pile source prior to the letting and on the basis of a certified mill test analysis of the steel.  Steel pipe shall meet the requirements of IM 107, Group 1, Buy America.

 

Approved Rolling Mills for Steel Pipe Piles are listed in IM 467.03 Appendix A

 

BASIS OF ACCEPTANCE

The manufacturer and/or contractor shall furnish an identification list for each and every shipment to a project. It shall include the project number, design number, heat number, number of pieces, size and length of pipe in the shipment. A Certified Mill Analysis for each shipment is required. The Mill Analysis shall itemize the materials, the ASTM steel designation, section number description, heat number, actual or theoretical mass and the physical as well as the chemical test analysis/characteristics. The Mill Analysis shall indicate compliance with the applicable specification requirements.

 

At the time of shipment one copy of properly identified Certified Mill Analysis and identification list (showing project number, county, type of piles, and number of pieces) shall be forwarded to the Project Engineer and one copy to the respective District Materials Engineer.

 

 

CARRIER PIPE WELD PROCEDURE

Thickness            T      ≥ 3/8”

Root Opening    R     0 to 3/16”

Root Face            F      0 to 1/8”

Groove Angle    a   30° to 45°

 

 

 

Welder Qualification in accordance with IM 560 except AWS D1.1 is allowed.

Welder Certification – Position of Groove 3G & 4G or 5G, AWS D1.1 or D1.5.

Preheat Temperature 32° F.

Welding process - Shielded Metal Arc Weld (SMAW) or Flux Core Arc Weld (FCAW).

Weld according to IM 558.

 

 

CARRIER PIPE WALL THICKNESS

 

 

Nominal Diameter (inches)

Nominal Thickness (inches)

12 ¾ and under

0.188

14

0.250

16

0.281

18

0.312

20 and 22

0.344

24

0.375

26

0.406

28

0.438

30

0.469

32

0.500

34 and 36

0.531

38

0.562

40

0.594

42

0.625

44 and 46

0.656

48

0.688

50

0.719

52

0.750

54

0.781

56 and 58

0.812

60

0.844

62

0.875

64

0.906

66 and 68

0.938

70

0.969

72

1.000

 

 

CARRIER PIPE CONCRETE TRANSITION END SECTION

 

 

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