Contech Construction A-2000, D-2000 User Manual
A-2000™/ D-2000™ PVC Pipe for Storm Sewers and Drainage
Knowledge. Solutions. Service.
Selecting Performance Storm Sewers
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HDPE
PVC
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HDPE
PVC
and Drainage Systems
Drainage systems are required to meet multiple criteria.
The choice of a particular material depends upon a
number of factors; however, the best choice is the one
that yields the best performance over the project life cycle.
Thermoplastic Storm Sewer and Drainage Pipe
In recent years, the use of thermoplastic pipe for
stormwater drainage systems has gained wide
acceptance—based upon performance and economic
advantages when contrasted with more conventional
drainage pipe materials. However, when it comes to
performance, not all thermoplastic storm sewer
pipes are equal. There are distinct differences between
A-2000/D-2000 Polyvinyl Chloride (PVC) drainage pipe
and other drainage pipes that can affect overall pipe
system performance.
Strength
CONTECH's
PVC compound
provides 6 times
greater long-term
material stiffness as
compared to HDPE
resin. And UNLIKE M294
HDPE pipe, it has a minimum
46 pipe stiffness for ALL diameters.
Better Deflection Control
Minimum Specified Pipe Stiffness (73o)
CONTECH® A-2000 PVC Drainage Pipe:
Available in Diameters 4”-36” and 12.5’, 14’ and
22’ lengths.
Originally developed in the early 1980’s, A-2000 has
built an outstanding performance history that‘s setting the
standard for gravity flow, sanitary sewer applications. The
material advantages offered by PVC—plus the innovative,
double wall design with the unique, patented gasketed
joint system—makes A-2000 and more recently D-2000
the ideal choice for stormwater drainage systems. Now
you can have all of the advantages without the limitations
of AASHTO M294 corrugated HDPE (M294 HDPE pipe)
or reinforced concrete pipe.
18” PVC – HDPE Wall Sections
Compact A-2000 PVC profile is stable and not
subject to local buckling like M294 HDPE pipe.
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Pipe Diameter PVC
12 46 50
15 46 42
18 46 40
24 46 34
30 46 28
36 46 22
Pipe Stiffness Retention vs. Temperature
Percent of Stiffness
Pipe Wall Temperature – Degrees F
ASTM F949
PVC
Corrugated AASHTO
M294
Non reinforced HDPE
When compared to other
thermoplastic pipes on the
market, A-2000 stands up to
the test. In fact, it comes out on
top.
When installed in accordance
with ASTM D2321, A-2000 provides
excellent shape control (performance).
Simple surface temperature measurements on
sun-exposed pipe surfaces indicate that under normal
temperatures, black M294 HDPE pipe approaches 140˚F,
while lighter color white pipe reaches temperatures in the
range of 120˚F. The difference between effective pipe
stiffness of PVC and M294 HDPE pipe during construction
on a summer day can result in A-2000 being as much as
3 TIMES STIFFER. This significant stiffness advantage
means A-2000 can be installed with conventional flexible
pipe practice and not experience excessive shape distortions
- lowering installation cost.
Heights of Cover
Based on research done under the National Cooperative
Highway Research Program, AASHTO has revised
its plastic pipe design methods. AASHTO Section 12
designs now include wall profile stability, soil arching
and deflection as design considerations. Unstable wall
profiles will fail due to local buckling rather than by ring
compression or ring buckling. This research demonstrates
that A-2000 profile walls are stable while others, like
those used for M294 HDPE pipe, are not.
When selecting a system based on pipe stiffness,
material strength and structural capability,
A-2000 PVC far exceeds the performance
characteristics of M294 HDPE pipe.
A comparison of cover heights using AASHTO design
methodology and H20 live loading for A-2000 and a major
manufacturer’s M294 HDPE pipe are summarized below.
A-2000 vs. M294 HDPE Heights of Cover
Pipe Type/ Allowable Allowable Min. Min.
Specification Ht. of Cover Structural Compaction Trench
Backfill
PVC A-2000 - ASTM F949 1’-20’ A1A, A1, A3 90% 1.5 X O.D. +12”
A2-4, A2-5
21’-35’ A1A, A1, A3 95% 1.5 X O.D. +12”
AASHTO M294 HDPE 1’-10’ A1A, A1, A3 95% O.D. + 36”
11’-20’ A1A 95% 3.0 x O.D.
21’-35’ Not Allowed
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