Diamond Plastics manufactures 4” through 12” cast iron O.D. PVC pressure pipe
in accordance with AWWA C900, Standard for Polyvinyl Chloride (PVC) Pressure Pipe
and Fabricated Fittings, 4 In. Through 12 In. (100 mm Through 300 mm) for Water
Transmission and Distribution.
This standard contains manufacturing and quality assurance requirements for
gasketed PVC pipe with three pressure classes: PR 165 (DR25), PR 235 (DR18) and
PR 305 (DR 14). This standard was originally published in 1975 and these products
have come to dominate the municipal water distribution and sewage force main market
over the past thirty two (32) years due to their tremendous strength, flexibility,
resistance to corrosion and superior hydraulics.
Their resistance to corrosion and flexibility make them practically impervious to
the kinds of water line breaks experienced by products of the past which corrode and
break during spring thaw or other soil shifting events. This substantially reduces water
loss as well as maintenance and repair costs.
Resistance to corrosion and extremely smooth wall surfaces dramatically decrease the kinds
of internal wall sediment buildup which reduces flow capacity and causes “red water” at the tap.
These products are suitable for most pressure applications for which bottle tight joints and corrosion
resistance are desirable.