Conduit / Pipe Rehabilitation - Revision history

Jeremy.franz@state.co.us at 16:44, 21 January 2025

2025-01-21T16:44:13Z

← Older revision		Revision as of 16:44, 21 January 2025
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	==Seepage Control==		==Seepage Control==
			Deteriorated conduits may be acting as a drain within the dam and sliplining the conduit may cut off this pore water pressure relief. Designs should include measures to continue providing drainage while also filtering the seepage. One way to achieve this is to install a filter diaphragm around the conduit near the downstream toe.

	A filter diaphragm is a designed zone of filter material (usually well-graded, clean sand) constructed around a conduit. It is a standard defensive design measure to prevent problems associated with seepage or internal erosion in earthfill surrounding a conduit. The purpose of a filter diaphragm is designed to intercept water that can flow through cracks that may occur in compacted fill surrounding conduits or water that may flow along the interface between the conduit and the surrounding fill.		A filter diaphragm is a designed zone of filter material (usually well-graded, clean sand) constructed around a conduit. It is a standard defensive design measure to prevent problems associated with seepage or internal erosion in earthfill surrounding a conduit. The purpose of a filter diaphragm is designed to intercept water that can flow through cracks that may occur in compacted fill surrounding conduits or water that may flow along the interface between the conduit and the surrounding fill.

			[[Construction]] of a high quality filter diaphragm under an existing conduit presents challenges due to difficult access. There are various ways to overcome these challenges depending on the details of the site. Consider A) cutting out a portion of the host pipe to allow for compaction, then replacing prior to sliplining, and B) over-excavation to a deeper bottom elevation, placing and compacting the filter, then utilizing a low strength concrete cradle under the pipe to ensure the void is filled.

	Filter Diaphrams are Important Protection from Erosion Along Pipe		Filter Diaphrams are Important Protection from Erosion Along Pipe

Grichards@gfnet.com at 21:06, 19 June 2023

2023-06-19T21:06:46Z

← Older revision		Revision as of 21:06, 19 June 2023
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	*[[⚠ May require more grout than anticipated]]		*[[⚠ May require more grout than anticipated]]
	References</br>		References</br>
	[https://3.~~238.206.13~~/images/8/8a/Cellular_Grout_Use_in_Conduit_Sliplining.pdf Cellular Grout Use in Conduit Sliplining]		[https://damtoolbox.org/images/8/8a/Cellular_Grout_Use_in_Conduit_Sliplining.pdf Cellular Grout Use in Conduit Sliplining]

	==Cured-in-place pipe (CIPP)==		==Cured-in-place pipe (CIPP)==
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	*Inability to accommodate internal and external loadings when the original conduit is severely damaged.		*Inability to accommodate internal and external loadings when the original conduit is severely damaged.
	References</br>		References</br>
	[https://3.~~238.206.13~~/images/1/1d/You_Down_with_CIPP%3F_%E2%80%93_Yeah%21_You_Know_Me%21.pdf You Down with CIPP? – Yeah! You Know Me!]		[https://damtoolbox.org/images/1/1d/You_Down_with_CIPP%3F_%E2%80%93_Yeah%21_You_Know_Me%21.pdf You Down with CIPP? – Yeah! You Know Me!]

	==Internal Sleeve==		==Internal Sleeve==
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	References</br>		References</br>
	[https://3.~~238.206.13~~/images/b/ba/Mechanical_Seals_for_Conduit_Repair.pdf Mechanical Seals for Conduit Repair]		[https://damtoolbox.org/images/b/ba/Mechanical_Seals_for_Conduit_Repair.pdf Mechanical Seals for Conduit Repair]

	==Seepage Control==		==Seepage Control==

Grichards at 00:26, 2 December 2022

2022-12-02T00:26:57Z

← Older revision		Revision as of 00:26, 2 December 2022
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	Rehabilitation is typically accomplished by one of three methods, sliplining solid pipe, installing cured-in-place pipe (CIPP) liners, or using internal sleeves. Any time you change the equilibrium of a pipe by adding internal lining, there is risk that seepage will begin to move along the outside of the pipe. Thus, seepage control must also be considered.		[[Category:Rehab vs. Replacement Outlet Works]]
			[[Rehabilitation]] is typically accomplished by one of three methods, sliplining solid pipe, installing cured-in-place pipe (CIPP) liners, or using internal sleeves. Any time you change the equilibrium of a pipe by adding internal [[lining]], there is risk that seepage will begin to move along the outside of the pipe. Thus, seepage control must also be considered.

	==Slipline Solid Pipe==		==Slipline Solid Pipe==
	Sliplining is completed by installing a smaller, "carrier pipe" into a larger "host pipe", grouting the annular space between the two pipes, and sealing the ends. The carrier pipe is commonly made of steel or plastic.		Sliplining is completed by installing a smaller, "carrier pipe" into a larger "host pipe", [[grouting]] the annular space between the two pipes, and sealing the ends. The carrier pipe is commonly made of steel or plastic.
	*[[Slipline Example 1]]		*[[Slipline Example 1]]
	*[[Slipline Example 2]]		*[[Slipline Example 2]]

Grichards at 19:58, 15 September 2022

2022-09-15T19:58:54Z

← Older revision		Revision as of 19:58, 15 September 2022
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	*[[Filter Diaphragm may Require Downstream Pipe Replacement or Extension]]		*[[Filter Diaphragm may Require Downstream Pipe Replacement or Extension]]


			''Note: The content on this page was originally created as part of DamOutletWorks.org (DOWL, 2018). It has subsequently been updated and reformatted as part of the Dam Safety Toolbox.''
	[[Category:Example Pages]]		[[Category:Example Pages]]
	{{Revhistinf}}		{{Revhistinf}}

Rmanwaring: Rmanwaring moved page Rehabilitation to Conduit / Pipe Rehabilitation

2022-09-08T22:50:24Z

Rmanwaring moved page Rehabilitation to Conduit / Pipe Rehabilitation

← Older revision	Revision as of 22:50, 8 September 2022
(No difference)

Camrenbt at 15:59, 24 June 2022

2022-06-24T15:59:07Z

← Older revision		Revision as of 15:59, 24 June 2022
Line 45:		Line 45:

	Filter Diaphrams are Important Protection from Erosion Along Pipe		Filter Diaphrams are Important Protection from Erosion Along Pipe
	*[[Filter ~~Diaphram~~ Exhibits]]		*[[Filter Diaphragm Exhibits]]

	Downstream Pipe Treatment		Downstream Pipe Treatment

Camrenbt at 21:11, 23 June 2022

2022-06-23T21:11:59Z

← Older revision		Revision as of 21:11, 23 June 2022
Line 39:		Line 39:

	References</br>		References</br>
	[~~[File~~:Mechanical Seals for Conduit Repair~~.pdf]~~]		[https://3.238.206.13/images/b/ba/Mechanical_Seals_for_Conduit_Repair.pdf Mechanical Seals for Conduit Repair]

	==Seepage Control==		==Seepage Control==

Camrenbt at 21:11, 23 June 2022

2022-06-23T21:11:28Z

← Older revision		Revision as of 21:11, 23 June 2022
Line 31:		Line 31:
	*Inability to accommodate internal and external loadings when the original conduit is severely damaged.		*Inability to accommodate internal and external loadings when the original conduit is severely damaged.
	References</br>		References</br>
	[~~[File~~:You Down with CIPP? – Yeah! You Know Me!~~.pdf]~~]		[https://3.238.206.13/images/1/1d/You_Down_with_CIPP%3F_%E2%80%93_Yeah%21_You_Know_Me%21.pdf You Down with CIPP? – Yeah! You Know Me!]

	==Internal Sleeve==		==Internal Sleeve==
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	*[[Internal Repair of Isolated Damage (Joint)]]		*[[Internal Repair of Isolated Damage (Joint)]]

	References		References</br>
	Mechanical Seals for Conduit Repair		[[File:Mechanical Seals for Conduit Repair.pdf]]

	==Seepage Control==		==Seepage Control==

Camrenbt at 21:09, 23 June 2022

2022-06-23T21:09:49Z

← Older revision		Revision as of 21:09, 23 June 2022
Line 9:		Line 9:
	*[[⚠ May require more grout than anticipated]]		*[[⚠ May require more grout than anticipated]]
	References</br>		References</br>
	[~~[File~~:Cellular Grout Use in Conduit Sliplining~~.pdf]~~]		[https://3.238.206.13/images/8/8a/Cellular_Grout_Use_in_Conduit_Sliplining.pdf Cellular Grout Use in Conduit Sliplining]

	==Cured-in-place pipe (CIPP)==		==Cured-in-place pipe (CIPP)==

Camrenbt: Created page with "Rehabilitation is typically accomplished by one of three methods, sliplining solid pipe, installing cured-in-place pipe (CIPP) liners, or using internal sleeves. Any time you change the equilibrium of a pipe by adding internal lining, there is risk that seepage will begin to move along the outside of the pipe. Thus, seepage control must also be considered. ==Slipline Solid Pipe== Sliplining is completed by installing a smaller, "carrier pipe" into a larger "host pipe",..."

2022-06-23T21:05:28Z

Created page with "Rehabilitation is typically accomplished by one of three methods, sliplining solid pipe, installing cured-in-place pipe (CIPP) liners, or using internal sleeves. Any time you change the equilibrium of a pipe by adding internal lining, there is risk that seepage will begin to move along the outside of the pipe. Thus, seepage control must also be considered. ==Slipline Solid Pipe== Sliplining is completed by installing a smaller, "carrier pipe" into a larger "host pipe",..."

New page

Rehabilitation is typically accomplished by one of three methods, sliplining solid pipe, installing cured-in-place pipe (CIPP) liners, or using internal sleeves. Any time you change the equilibrium of a pipe by adding internal lining, there is risk that seepage will begin to move along the outside of the pipe. Thus, seepage control must also be considered.

==Slipline Solid Pipe==
Sliplining is completed by installing a smaller, "carrier pipe" into a larger "host pipe", grouting the annular space between the two pipes, and sealing the ends. The carrier pipe is commonly made of steel or plastic.
*[[Slipline Example 1]]
*[[Slipline Example 2]]
Slipline Cautions:
*[[⚠ May force water along outside of pipe]]
*[[⚠ May require more grout than anticipated]]
References</br>
[[File:Cellular Grout Use in Conduit Sliplining.pdf]]

==Cured-in-place pipe (CIPP)==
What is CIPP?
Cured-in-place pipe (CIPP) is a common method used to rehabilitate outlet conduits in dams. The CIPP system consists of a flexible fabric tube and a resin system that is hardened by a curing method. CIPP is installed inside an existing pipeline by either an inverstion method or a pulled-in-place method. After the CIPP is installed, it is cured in place using one of several available techniques and forms to the shape of the existing pipe, including minor irregularities.

*[[CIPP Works well for Smaller Conduits]]
*[[⚠ Cautions for CIPP in Large Diameter Conduit]]
CIPP Examples:
*[[CIPP Example 1]]
*[[CIPP Example 2]]

'''Advantages of CIPP:'''
*CIPP is corrosion resistant and is not affected by naturally occurring soil and water conditions. It may be preferable in certain conduit applications where aggressive water or soil chemistry would limit the life of concrete or metal pipe.
*The smooth interior surface reduces friction loss. Also, due to the very smooth surface of pipe, adherence of minerals (e.g., calcium carbonate) is minimized.
*Thermoset plastic pipe resists biological attack
*Typically, the need for grouting of the annulus between the CIPP liner and existing conduit is eliminated, since it is tight fitting
'''Disadvantages of CIPP:'''
*High material and installation costs.
*Not suited for conduits with significant bends or changes in diameter.
*Inability to accommodate internal and external loadings when the original conduit is severely damaged.
References</br>
[[File:You Down with CIPP? – Yeah! You Know Me!.pdf]]

==Internal Sleeve==
What is an internal sleeve?
Internal pipe sleeves are used for in-place rehabilitation. Typically, a rubber sleeve is applied over the damaged area of the inner wall of the pipe. The sleeve is then held in place by stainless steel retaining bands. Installation time can be as little as 40 minutes per sleeve and provides a noncorrosive, bottle-tight connection around the full inside circumference of the pipe.
*[[Internal Repair of Isolated Damage (Joint)]]

References
Mechanical Seals for Conduit Repair

==Seepage Control==
A filter diaphragm is a designed zone of filter material (usually well-graded, clean sand) constructed around a conduit. It is a standard defensive design measure to prevent problems associated with seepage or internal erosion in earthfill surrounding a conduit. The purpose of a filter diaphragm is designed to intercept water that can flow through cracks that may occur in compacted fill surrounding conduits or water that may flow along the interface between the conduit and the surrounding fill.

Filter Diaphrams are Important Protection from Erosion Along Pipe
*[[Filter Diaphram Exhibits]]

Downstream Pipe Treatment
*[[Filter Diaphragm may Require Downstream Pipe Replacement or Extension]]

[[Category:Example Pages]]
{{Revhistinf}}