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<br />completed prior to selecting replacement or
<br />rehabilitation.
<br />Which in-situ rehabilitation method should I select?
<br />• A designer should evaluate both sliplining and CIPP
<br />for any rehabilitation project. The advantages and
<br />disadvantages of each alternative should be
<br />carefully evaluated for each specific site.
<br />• An HDPE carrier pipe is a cost effective alternative
<br />for small-diameter conduits requiring a flexible
<br />pipe that is subjected to minor to nominal external
<br />and internal loadings. HDPE pipe may also be
<br />preferred in highly corrosive environments.
<br />• A CIPP liner provides similar benefits to that of
<br />HDPE sliplining, but requires the use of a specialty
<br />contractor
<br />• A steel carrier pipe may be the preferred choice for
<br />straight host pipes with larger diameters and
<br />nominal to high internal and external loadings.
<br />Common Pitfalls in Sliplining:
<br />• Suitable grout mix to grout full length of annulus
<br />• Avoid pipe damage during construction. Inspect
<br />and repair any that occurs.
<br />• Use experienced contractors
<br />• Consider any potential reduction in capacity
<br />
<br />References
<br />The following is a list of design references that should be used during
<br />design:
<br />• FEMA (2005), Technical Manual: Conduits through Embankment
<br />Dams, FEMA 484, Federal Emergency Management Agency,
<br />September 2005.
<br />• USACE (2001), Technologies and Techniques for Drainage Pipe
<br />Maintenance and Repair: A Practical Guide to Technology Selection,
<br />USACE, 2001.
<br />• CPChem (2003), The Performance Pipe Engineering Manual,” CPChem
<br />Performance Pipe, 2003.
<br />• NRCS (2005), Structural Design of Flexible Conduits, NRCS, 2005.
<br />• PPI, Handbook of Polyethylene Pipe, Plastic Pipe Institute (PPI).
<br />• FEMA (2007), Plastic Pipe Used in Embankment Dams, FEMA, 2007.
<br />• AWWA (2004), Steel Water Pipe: A Guide for Design and Installation,
<br />AWWA, M11, 2004.
<br />• Amstutz (1970), Buckling of Pressure Shafts and Tunnel Linings,
<br />Amstutz, Ing. Ernst, 1970
<br />• Jacobsen (1974), Buckling of Circular Rings and Cylindrical Tubes
<br />under External Pressure, Jacobsen, S., 1974.
<br />• USACE (2005), Guidelines for Trenchless Technology: Cured-in-Place
<br />Pipe (CIPP), Fold-and-Formed Pipe (FFP), Mini-Horizontal Directional
<br />Drilling (Mini HDD), and Microtunneling, Construction Productivity
<br />Advancement Research (CPAR) Program, Report No. CPAR-GL-95-2,
<br />USACE, 1995.
<br />• Annulus Grouting of Slipliner Rehabilitation by B. Jay Schrock, P.E.,
<br />F.ASCE
<br />• Cured-In-Place Pipe: A Cure for Outlet Problems (2009) by Fischer,
<br />Gary R.
<br />• The Inspection and Rehabilitation of Corrugated Metal Pipes Used in
<br />Embankment Dams (2000) by Kula, Joseph R.; Zamensky, Gregory A.;
<br />King, Timothy J.
<br />• Rehabilitation of failed corrugated metal pipe spillways (1996) by Van
<br />Aller, Harald W.
<br />• Rehabilitation of Large Diameter PCCP: Relining and Sliplining with
<br />Steel Pipe by Shah Rahman; Greg Smith; Richard Mielke; and Brent
<br />Keil
<br />• Sliplining at Lake Toxaway - problems and solutions (2004) by Bendel,
<br />Russell; Basinger, Donald
<br />
<br />FEMA’s technical manuals provide detailed discussion
<br />of parameters that should be considered during the
<br />sliplining design process.
<br />FEMA - Conduits through Embankment Dams
<br />FEMA - Plastic Pipe Used in Embankment Dams
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