| Polymer Mortar
Construction |
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Introduction
Since one ingredient of HOBAS pipes is glass fiber reinforcement,
HOBAS pipes are commonly referred to as fiberglass pipes. However,
unlike most traditional fiberglass pipes, the main constituent
material in HOBAS pipes is not fiberglass, but a polymer mortar.
HOBAS pipes are actually more similar to concrete pipes (RCP) than
fiberglass pipes, but they exhibit many of the best features and
performance benefits of both.
Construction and Design
The HOBAS pipe wall is constructed with thermoset polyester (or
vinyl ester) resin, glass fiber reinforcements, and additives,
primarily sand. Compared with RCP, the resin replaces the
cement-water matrix binder, the glass fibers replace the
reinforcing steel, and both products contain additives (sand,
aggregate, etc.). Much like RCP, the HOBAS wall materials are
placed in precise locations to maximize performance. The glass
fiber reinforcements are predominantly positioned near the inside
and outside surfaces, similar to RCP double cage configurations.
For pressure pipes, the heavily reinforced areas are increased in
thickness as the pressure rating advances. The glass content
reduces toward the center of the wall where ring bending stresses
are zero. The very inside layer of HOBAS pipes consists of a
resilient, high elongation pure resin.
Manufacturing
HOBAS pipes are manufactured by a unique, computer-controlled,
centrifugal casting process instead of the filament wound method
most common to traditional fiberglass pipes. The HOBAS casting
process produces very consistent, high density pipes with smooth
interior and exterior surfaces.
Applications and Service Range
HOBAS pipes are a high performance product suitable for a wide
range of installation methods and applications including many
corrosive environments, high loads, and elevated temperature
service.
Environments
|
Installations
|
| Sanitary
sewage |
Open cut |
| Industrial
effluents |
Sliplining |
| Salt water |
Direct
jacking |
| Contaminated
drainage |
Microtunneling |
| Cooling water |
Tunnel lining |
| Foul air |
Aboveground |
Features and Benefits
HOBAS pipes have the best features and performance benefits
of both filament wound fiberglass (FW) and reinforced concrete
pipes (RCP) in addition to other unique benefits:
Features
|
FW
|
RCP
|
HOBAS
|
HOBAS Benefits
|
| Inherent
Corrosion Resistance |
YES |
NO |
YES |
- No add-on linings needed
- Long service even in
corrosive environments
- Hydraulics nearly
unchanged with time
|
| High Stiffness
or Rigid Design |
NO |
YES |
YES |
- Easy to bury by routine
methods
- Predictable performance
- Handles deep covers with
ease
- Pipes are rugged and
durable
|
| Oversized
I.D.'s Typical |
NO |
NO |
YES |
- Delivers more fluid than
any corrosion resistant pipe
- Permits greater flow
recovery in rehabilitated lines
|
| Leak-free
Joints |
YES |
NO |
YES |
- Zero infiltration lowers
treatment costs
- Zero exfiltration in
environmentally sensitive areas
- No wasted time and
expense to find and seal leaks
|
| Smooth Interior
Surface |
YES |
NO |
YES |
- Excellent hydraulic
characteristics
- High Flow Capacity
|
| Lightweight/Long
Length Sections |
YES |
NO |
YES |
- Lighter, less expensive
equipment for handling
- Fewer joints to assemble
|
| Push together
assembly (gasket-sealed joints) |
Some |
YES |
YES |
- No treatments, bonding
agents or chemicals required
- Fast joining
|
| Mold Smooth
Dimensionally Consistent O.D. |
NO |
NO |
YES |
- Pipe may be cut and
joined by simply chamfering ends
- Less exterior friction
for jacking or slipline insertion
|
| High Density
Low Void Content Wall |
NO |
NO |
YES |
|
| Thick Pipe Wall |
NO |
YES |
YES |
- Increased impact
strength
- Rugged handling
performance
|
| High
Compressive Load Capacity |
NO |
YES |
YES |
- High factors of safety
in wall crushing even at deep covers
|
| Easy to-Mold,
Miter, or Cast |
YES |
NO |
YES |
- Fabrication versatility
- Easy to make all fitting
angles
|
| Dimensional
Stability |
YES |
NO |
YES |
- Low tolerance precision
parts routinely available
|
| Computer
Controlled Production Process |
NO |
NO |
YES |
- Consistent high quality
pipes
|
Conclusion
HOBAS centrifugal cast, glass-fiber-reinforced, thermoset resin
mortar (reinforced polymer mortar) pipes provide many benefits
including those of traditional fiberglass pipes, RCP, and others.
To enjoy the "best of all worlds," specify and use
unique HOBAS pipes on your next project.
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