- ENGINEERING INFO
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The material properties of PVC make PVC a better choice than Ductile Iron for many applications. The following table lists the properties for both PVC and Ductile Iron that are most important to the design of piping systems:
|Tensile Strength (PSI)||ASTM D-638||7,000||60,000|
|Specific Gravity||ASTM D-1505||1.40||7.1|
|Dimension Ratio||Pressure Rating||Pressure Class||Pressure Rating|
|DR 18||235 PSI||350||350 PSI|
|DR 21||200 PSI||300||300 PSI|
|DR 25||165 PSI||250||250 PSI|
|DR 32.5||125 PSI||200||200 PSI|
|DR 41||100 PSI||150||150 PSI|
|DR 51||80 PSI||100||100 PSI|
Fusible PVC® will require a smaller bore hole diameter than other pipe systems. A smaller bore-hole diameter means that there will be less back reaming, less drilling mud, and less spoil disposal. The following comparisons illustrate these advantages.
The larger outside diameter of Ductile Iron pipe requires casing sizes to be larger in jack and bore applications. Fusible PVC® can utilize smaller casings, which ultimately lead to lower material and installation costs. In addition, Ductile Iron requires the use of casing spacers, which are not a requirement for Fusible PVC®.
Fusible PVC® will require a more narrow trench width for direct bury than Ductile Iron Pipe, due to the larger outer diameter on the Ductile Iron Pipe. A smaller trench volume means that there will be less excavation, less backfilling and less spoil disposal. The drawing below illustrates these advantages.