AMERICAN Fastite joint push-bar pipe, furnished in sizes 4" through 64", allows the AMERICAN Fastite joint to be used in trenchless installations using direct jacking or pushing (including high load installations such as microtunneling and some pipe-bursting applications).
Fastite push-bar pipe employs an economical adaptation of the premier AMERICAN Fastite joint to transfer jacking loads from the pipe barrel directly to the face of the bell. It consists of a high-strength alloy steel ring – the “push-bar” – shop welded to the standard Fastite pipe spigot. This ring is made of the same material that has been used successfully in AMERICAN’s Lok-Ring and other restrained joints since 1967. A cushioning compression ring, made of compressible wood products, fits between the push-bar and the pipe bell for added assurance of load distribution. The pipe comes in standard 20’ or less nominal laying lengths and carries the standard Fastite joint pressure ratings.
During installation, Fastite joint push-bar pipe is jacked or pushed with the spigots ahead. This allows for any debris remaining from the pipe bursting or pipe jacking operation to flow smoothly over the bell of the Fastite joint.
This table tabulates the maximum depth of cover for the five types of laying conditions, along with corresponding nominal wall thickness and maximum rated working pressure, all for minimum pressure classes of ductile iron pipe. Taken from the table that follows, it is offered as a convenience for quickly checking the capabilities of minimum pressure classes of ductile iron pipe under a given set of conditions.
For the majority of internal pressure and external loading conditions, minimum pressure classes are more than adequate and possess substantial safety factors.
Size | Pressure | Thickness | Laying Conditions | ||||
|---|---|---|---|---|---|---|---|
Type 1 | Type 2 | Type 3 | Type 4 | Type 5 | |||
4 | 350 | 0.25 | 53 | 61 | 69 | 85 | 1004 |
6 | 350 | 0.25 | 26 | 31 | 37 | 47 | 65 |
8 | 350 | 0.25 | 16 | 20 | 25 | 34 | 50 |
10 | 350 | 0.26 | 112 | 15 | 19 | 28 | 45 |
12 | 350 | 0.28 | 102 | 15 | 19 | 28 | 44 |
14 | 250 | 0.28 | see3 | 112 | 15 | 23 | 36 |
16 | 250 | 0.3 | see3 | 112 | 15 | 24 | 34 |
18 | 250 | 0.31 | see3 | 102 | 14 | 22 | 31 |
20 | 250 | 0.33 | see3 | 10 | 14 | 22 | 30 |
24 | 200 | 0.33 | see3 | 82 | 12 | 17 | 25 |
30 | 150 | 0.34 | see3 | - | 9 | 14 | 22 |
36 | 150 | 0.38 | see3 | - | 9 | 14 | 21 |
42 | 150 | 0.41 | see3 | - | 9 | 13 | 20 |
48 | 150 | 0.46 | see3 | - | 9 | 13 | 20 |
54 | 150 | 0.51 | see3 | - | 9 | 13 | 20 |
60 | 150 | 0.54 | see3 | 52 | 9 | 13 | 20 |
64 | 150 | 0.56 | see3 | 52 | 9 | 13 | 20 |
1) These pipes are adequate for the rated working pressure indicated for each nominal size plus a surge allowance of 100 psi. Calculations are based on a 2.0 safety factor times the sum of working pressure and 100 psi surge allowance. Ductile iron pipe for working pressures higher than 350 psi is available.
2) An allowance for a single H-20 truck with 1.5 impact factor is included for all sizes and all depths of cover.
3) Minimum allowable depth of cover is 3’. For depths less than 3’, consult AMERICAN.
4) Calculated maximum depth of cover exceeds 100’.
5) Laying condition Type 1 is limited to 12" and smaller pipe. For 14" and larger pipe, laying condition Type 1 should not be used.
For other conditions not covered in these tables see AWWA C150 or consult AMERICAN for design of pipe thickness. Special thickness classes may be appropriate in such cases.
