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technical archives
TRIC Training Log:
06-19-04
Client: Orange Coast Plumbing, Santa Ana, CA
Job: Replace 4” C. I. drain line under concrete patio at fire station
Pull: 40’ / 4” / SDR17 / Downstream
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The pull: 40’ under concrete, pulling hole (in foreground) is downstream.
Material to be replaced is bell-and-spigot 4” cast iron.
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Fusing: Watch closely, and join ends just enough to see an even bead roll from each
facing surface. Going further will weaken the joint by pushing beyond the melted material.
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Bead reaming: After each joint has completely cooled, leave pipe in fusion jig for
support and alignment during the bead reaming process (required in some areas).
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Alignment: Adjust entire length of pipe from side to side or up and down to match ends as closely
as possible before trimming. Some PE pipe may be slightly out of round due to storage or
temperature variations. In this case, rolling the pipe in the jig can help match outside diameters.
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Heating iron: Factory set at 450º, here shown set at 500º. Allow a half-hour to warm up.
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Fusing logistics: You may elect to fuse head assembly last. Putting the head on one
end of the line versus the other can greatly facilitate entry positioning.
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Cooling: For most common PE pipe sizes up to 6” diameter, a good rule of thumb is 10
minutes per joint. Pipe should remain undisturbed while cooling. See manufacturer’s
specifications for further details.
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Entry hole: Note relatively tight angle of attack. Here the top of the old pipe in the
ground is broken out to ease entry.
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Almost ready: Head assembly is attached to the cable. Note orange spray paint on cable just before
clevis sheath (cable terminator). This makes clevis more visible as it approaches the pulley assembly.
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Entry: Give the cable enough room to take up any slack before tension occurs. Also be aware of
which way the clevis assembly is “hinging” so that it moves in the natural direction of the pull.
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Good start: Flexible yet durable PE pipe can negotiate tight angles. Always monitor
head upon entry, to begin pull as smoothly as possible.
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Progress: After the first few feet, the length of pipe usually needs little attention.
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Least resistance: Monitor pipe to ensure that no unnecessary scraping or gouging
occurs as line is dragged into the earth. Here the concrete edge of the entry hole was
smooth enough so as not to require protection.
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Versatile: TRIC ram can operate at any axial rotation on pulley assembly. Also, note
pressure plate against utility line. If other utilities interfere with pull, pressure plate can be
rotated or even removed, and steel poles driven in its place to resist pulley pressure.
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Whatever works: Keep plenty of wood on hand. Thick plywood, 2” x 4” and 4” x 4”
lumber makes setup easier, and can even save the day.
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Freedom: Bursting head makes a complete exit, as clevis sheath (cable terminator)
reaches threshold of pulley housing.
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Excess is good: Always fuse enough pipe to extend beyond entry hole at end of pull.
This allows you to trim excess to optimal length for bumping.
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Perfect fit: Bumping from the other end to drive pipe right up to coupling. This also helps
to relieve any stretching that may have occurred in pipe during longer pulls through bends
and/or difficult ground conditions.
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Flex: Relieving curve “memory” in pipe, driving a wedge between top of pipe and earth.