City waste dumping grounds are designed to handle
the leachates which could be in liquid and gases forms.
The collection, transmission and disbursement of these
leachates need to be through closed piping network. The
piping used should be inherent to the chemical effects of
the leachate.
HDPE being inert materials, they get totally unaffected by
most of the chemicals and even chemicals which affect the
plastic materials, have been conveyed through these pipes
for minimum 100 years without much damage to the piping
system.
River water infiltration galleries are prepared to collect the
clean water (free from slit, clay) from the river bed for use in
city water supply, thermal power plants, coal mines, or any
industrial application. In the design of infiltration gallery, the
network of perforated/slotted HDPE pipes covered with geo
textile/fabric are installed at the specific depth below river
bed, above which layer of graded gravels are packed to stop
silt, clay flowing in to HDPE pipes. The water percolated
through these graded gravels, gets filtered through geo
textile/fabric and the clean filtered water enters in to
HDPE pipes through perforations or slots which is further
conveyed to jack/intake wells using HDPE pipes.
HDPE pipes supplied for such applications could be
plain ended, male-female threaded, spigot and socket
coupling type. The type of pipe joint depends on direction
of installation of pipes & site conditions, that is, horizontal
or vertical. The perforation made in HDPE pipe could
be drilled holes or slotted. The perforations could be all
along the surface of pipe or certain specific area on pipe
circumference.
