Page 215 - Trenchless Technology Piping Installation and Inspection

Pipe and Pipe Installation Considerations 179

consult with manufacturers to learn pipe product limitations. It
should be noted that sulfates and chlorides as well as low resistivity
soils in general can corrode various concrete pipes, and gasoline con-
tamination has been known to result in swelling and bursting of some
buried plastic pipes, whereas such contamination will not burst
metallic pipes.
The coverage of the topic of corrosion in this chapter is intended
to make the reader aware of one of the significant problems being
faced by pipeline industry today. These problems include corroding,
deteriorating, and/or failing water and sewer lines. There are cur-
rently huge amounts of pipeline system underground, some of which
are without effective corrosion protection or other provisions for
adverse environmental conditions. Pipe leakage and failure in these
unprotected pipelines can significantly influence rate of unaccounted-
for-water and inflow/infiltration in future. It is essential for engineers
to be aware of the problems and available engineering solutions as
they design and renew the pipeline systems of the future. Proper cor-
rosion protection will ensure that the full potential of all piping mate-
rials for use in specific applications is realized in the long run.

Applicable Standards The nonpressure standard ASTM A139 Grade B
is the type of casing pipe used in the gravity trenchless construction.
A pipe manufactured to the ASTM A139 standard requires hydro-
static testing because it is often also used for medium internal pres-
sure applications. As the use of the pipe for casing depends only on
its structural capabilities, the hydrostatic test is not required. To
exclude the hydrostatic test from the original standard, the casing
pipe standard is referred to as ASTM A139, Grade B (no hydro). The
pressure pipe standard AWWA C200 is used in large-diameter HDD
projects for water transmission; in past years, some challenging proj-
ects in Texas, Washington, and Hawaii have used this steel pipe stan-
dard. Permalok™ steel pipe is manufactured as a proprietary joint
type product for casing pipe and pressure trenchless applications.
The ASTM standards to which the pipe must be compliant are listed
in Table 4.19.

Pressure Standards Nonpressure Standards Available Diameters (in.)
AWWA C200 ASTM A139 Grade B
ASTM A36, ASTM ASTM A36, ASTM
A515, grade 60 or A515, grade 60 or ASTM 3–144 and higher
ASTM A572, grade A572, grade
42–with T7 type joint 42–with PERMALOK™ T5
type joint
TABLE 4.19 Applicable Standards for Steel Pipe for Trenchless Construction