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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**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. | ||
<gallery> | |||
Perforated Pipe 550x550.jpg|Pipe with slotted perforations | |||
Pipe with connector.jpg|Perfroated pipes on job site, 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 13:37, 14 March 2018
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) with a minimum inside diameter of 100 mm.
- Smooth interior facilitates inspection and maintenance activities; internal corrugations can cause cameras or hydrojetting apparatus to become snagged.
- Where freezing is a concern, horizontal underdrain pipes should be over-sized to a minimum 200 mm diameter.
- Perforations should be made on all sides of the pipe and provide a ≥ 1 m2 of open area per linear meter of pipe.
- 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.
Pipe with slotted perforations
Perfroated pipes on job site, 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.