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HOBAS
Chosen in Denver
The Delgany Common Interceptor, which follows the banks of the
South Platte River in Denver, Colorado, was in need of repair. The
proposed work included removal of the top half of the existing
aboveground brick lined sewer to accommodate the installation of
approximately 1,600 linear feet of new 72 inch diameter pipe
between I-70 and 50th Avenue.
Contractor's Choice
Trainor Construction Company of Golden, CO chose to install HOBAS
fiberglass pipes, due to their many cost saving advantages, in
lieu of the specified alternate of reinforced concrete pipe.
Reported factors which influenced Trainor's decision included the
light weight of the fiberglass pipe (typical Class 1 concrete
weights six to eight times more than HOBAS pipes in this
diameter). Using RCP would have required heavier lifting
equipment, which would have been very difficult to maneuver in the
project area due to the presence of overhead power lines. Another
benefit of using HOBAS pipe was its high strength pipe wall
(compressive strength of 2.5 times greater than typical concrete)
which allowed HOBAS pipes to achieve the required performance with
a much thinner wall. This resulted in significantly smaller OD's,
for HOBAS pipes compared to RCP, while still maintaining an
oversized inside diameter. On this project, the contractor would
have needed to remove the existing brick lining in order to fit
the 72 inch diameter concrete pipes into the remaining cradle. The
HOBAS option did not require this task. Because of all of the
installation savings, Trainor chose HOBAS.
Superior Performance
Project designers, Metro Wastewater Reclamation District --
Engineering Department and Burns & McDonnell Engineering
Company, were concerned about the potential for future corrosion
of the interceptor and required the concrete pipe alternates to
have sacrificial concrete (AZ design) along the entire alignment
and PVC lining in some areas. The highly corrosion resistant HOBAS
pipes required no additional linings or coatings to provide the
required corrosion protection. Other benefits of using the HOBAS
pipes for this job were the leak-free, gasket-sealed FWC coupling
joints and the non-porous pipe wall. Each joint was tested per the
specifications to 3.5 psi and every joint passed without any
problems.
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Joint Versatility
The existing pipeline included a 750 foot long curve with a total
deflection angle of nearly 47 degrees. By utilizing 10 foot pipe
sections, and deflecting the FWC coupling joints, the curve was
successfully relined without any mitered or beveled fittings. Also
purchased by Trainor were HOBAS tee-base manholes which were
likewise supplied with the gasket-sealed FWC coupling to join into
the liner at field determined locations. Since the pipes may be
joined anywhere along the entire OD using the FWC coupling,
predetermined manhole positioning or specially marked pipes are
not typically required with HOBAS, nor were they required on this
job.
Numerous Benefits
HOBAS pipes provide benefits to owners including leak-free joints
due to the tight sealing FWC couplings and a long design life due
to the superior corrosion resistance. Installers, such as Trainor,
often recognize the cost saving advantages of utilizing HOBAS
including the lightweight joint sections and field versatility.
This was the first HOBAS installation for both Denver Metro and
Trainor Construction. We are confident that they will be pleased
with the long-term performance of HOBAS pipes and look forward to
future installations.
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