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A "Pipeline" to the Future
Folded pipe debuts in Portsmouth
is a historic seaport city with a rich maritime history. Parts of
Portsmouth's sanitary sewer system mirror the city's history. These older sewers may show
their age with blockages and failures that can result in sewage backups and overflows and
even cave-ins that can effect the condition of the streets above.
Clay Pipe Woes
Clay pipe was the material of choice for sewer lines in the U.S. for many years.
Portsmouth used it from 1890 until 1972. While very resistant to sewage and gases, clay
pipe can have joint problems. Its brittleness can cause pipe failures in wet, shifting
soil conditions. Until recently replacement was the one sure way to fix failing clay
pipes. This was costly as the overlying street would have to be torn up and replaced along
with the pipe!
Rehab Uses Folded Pipe
A new rehabilitation technique using PVC pipe is being used in Portsmouth. Folded into a
"U" shape for easier insertion, long lengths of PVC pipe are pulled into the
clay sewers through manholes. Heat and pressure are applied to the PVC and it returns to
its round shape, tightly hugging the old clay pipe, providing strength and restoring the
sewer. 4,000 feet of sewer mains on Allard Road, London Boulevard, Washington Street,
Bolling Road and
Green Street have been restored using the folded "U" shaped liner. It has proven
to be a cost effective and reliable way to restore clay sewers. Folded liner restoration
is up to 50% lower in cost than total replacement.
Lining makes good $ense
350 miles of sanitary sewer lines can be costly. That is why our Department of Public
Utilities is putting new technology to work to reduce cost and extend the impact of its
maintenance dollars. The use of "no dig" methods like the folded sewer liner
featured in this article are one way Public Utilities is using good $ense to benefit the
citizens of Portsmouth.