Difference between revisions of "Pipes"
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[[File:Perforations.png|thumb|Pipes are available with perforations on just one side, these should be situated on the lower half of the pipe. Pipes with 360° perforations should have a strip of geotextile or membrane placed over the pipe to reduce the migration of fines from overlying media.]] | [[File:Perforations.png|thumb|Pipes are available with perforations on just one side, these should be situated on the lower half of the pipe. Pipes with 360° perforations should have a strip of geotextile or membrane placed over the pipe to reduce the migration of fines from overlying media.]] | ||
Perforated pipes are a common component of [[underdrains]], [[infiltration trenches]] and [[exfiltration trenches]]. | Perforated pipes are a common component of [[underdrains]], [[infiltration trenches]] and [[exfiltration trenches]]. | ||
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Pipes should have been manufactured in conformity with the latest standards by the Canadian Standards Association (CSA) or ASTM International. | Pipes should have been manufactured in conformity with the latest standards by the Canadian Standards Association (CSA) or ASTM International. | ||
| − | *Perforated pipes should be continuously perforated, smooth interior HDPE (or equivalent material) | + | *Perforated pipes should be continuously perforated, smooth interior HDPE (or equivalent material). |
| + | **Wherever possible pipes should be ≥ 200 mm internal diameter to reduce clogging and to facilitate inspections and maintenance. | ||
**Smooth interior facilitates inspection and maintenance activities; internal corrugations can cause cameras or hydrojetting apparatus to become snagged. | **Smooth interior facilitates inspection and maintenance activities; internal corrugations can cause cameras or hydrojetting apparatus to become snagged. | ||
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**A perforated pipe with many rectangular slots has better drainage characteristics than a pipe with similar open area provided by fewer circular holes <ref>Hazenberg, G., and U. S. Panu (1991), Theoretical analysis of flow rate into perforated drain tubes, Water Resour. Res., 27(7), 1411–1418, doi:10.1029/91WR00779.</ref>. | **A perforated pipe with many rectangular slots has better drainage characteristics than a pipe with similar open area provided by fewer circular holes <ref>Hazenberg, G., and U. S. Panu (1991), Theoretical analysis of flow rate into perforated drain tubes, Water Resour. Res., 27(7), 1411–1418, doi:10.1029/91WR00779.</ref>. | ||
| − | *Non-perforated pipes should be used for conveyance to and away from the facility, including overflow. | + | *Non-perforated pipes should be used for conveyance to and away from the facility, including [[overflow]]. It is good practice to extend the non-perforated pipe approximately 300 mm within the reservoir or practice to reduce the chance of migration from native soils clogging the pipe at the interface. |
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| + | <gallery mode="packed" widths=200px heights=200px> | ||
| + | Perforated Pipe 550x550.jpg|Pipe with slotted perforations | ||
| + | Pipe with connector.jpg|Perforated pipes awaiting installation, note the 30 degree connector used to facilitate maintenance. | ||
| + | </gallery> | ||
| + | See also: [[flow through perforated pipe]] | ||
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[[Category:Materials]] | [[Category:Materials]] | ||
Revision as of 18:53, 15 March 2019
Perforated pipes are a common component of underdrains, infiltration trenches and exfiltration trenches.
Pipes should have been manufactured in conformity with the latest standards by the Canadian Standards Association (CSA) or ASTM International.
- Perforated pipes should be continuously perforated, smooth interior HDPE (or equivalent material).
- Wherever possible pipes should be ≥ 200 mm internal diameter to reduce clogging and to facilitate inspections and maintenance.
- Smooth interior facilitates inspection and maintenance activities; internal corrugations can cause cameras or hydrojetting apparatus to become snagged.
- A perforated pipe with many rectangular slots has better drainage characteristics than a pipe with similar open area provided by fewer circular holes [1].
- Non-perforated pipes should be used for conveyance to and away from the facility, including overflow. It is good practice to extend the non-perforated pipe approximately 300 mm within the reservoir or practice to reduce the chance of migration from native soils clogging the pipe at the interface.
Pipe with slotted perforations
Perforated pipes awaiting installation, note the 30 degree connector used to facilitate maintenance.
See also: flow through perforated pipe
- ↑ Hazenberg, G., and U. S. Panu (1991), Theoretical analysis of flow rate into perforated drain tubes, Water Resour. Res., 27(7), 1411–1418, doi:10.1029/91WR00779.