Mab Basic Hdpe Repair Options Mab4 PDF
Mab Basic Hdpe Repair Options Mab4 PDF
Mab Basic Hdpe Repair Options Mab4 PDF
Established May 1, 2008 at the University of Texas, Arlington
First edition approved at MAB 22 hosted by San Antonio Water System, TX
© Plastics Pipe Institute, 2018, 2019
2nd Printing, September 2019
ACKNOWLEDGMENTS
The Municipal Advisory Board would like to acknowledge the excellent contributions of the MAB‐4
Basic HDPE Repair Options Task Group for developing and leading this project.
UTILITIES
Luis Aguiar Miami–Dade Water & Sewer (past), Hazen & Sawyer, FL, Co‐Chair
Jessie Allen, PE Arlington Water Utilities, TX
Alan Ambler, PE City of Casselberry, FL (past), AM Trenchless, FL
Marisa Boyce, PE* East Bay Municipal Utility District, CA
John Fishburne, PE Charlotte Water (past), Freese & Nichols, NC
David Freireich, PE City of Round Rock, TX
Todd Jorgenson Austin Utilities, Austin, MN
Holly Link* Colorado Springs Utilities, CO
Gordon Mahan SAWS, San Antonio, TX
Ryan McKaskle, PE* City of Tulsa, OK
Greg Scoby, PE City of Palo Alto (past), Crossbore Consultants, CA, Utility Chair
Eric Shaffer, PE* City of Duluth, MN
Dave Stewart* City of Lago Vista, TX
Matthew Wirtz, PE City of Ft Wayne, IN
UNIVERSITIES
Dr. Alan Atalah, PE Bowling Green State University, OH
Dr. Tom Iseley, PE TTC, Louisiana Tech University, LA
Dr. Mark Knight, PEng CATT, University of Waterloo, ON
Dr. Mo Najafi, PE CUIRE, University of Texas at Arlington, R&D Chair
CONTRACTORS
Todd Grafenauer Murphy Pipelines, WI
David Mancini David Mancini & Sons, FL
Kevin Miller Miller Pipeline Co., IN, Education Chair
CONSULTANTS
Joe Castronovo, PE AECOM (ret.), ASCE UESI, GA
Steven Kramer, PE COWI North America, Inc., NJ
Ernest Lever Infrastructure Sector, Gas Technology Institute, IL
PPI
Camille Rubeiz, PE Municipal & Industrial Division (M&I), TX, Co‐Chair
FORMER MEMBERS
Dr. Sam Ariaratnam, PE Arizona State University, AZ
Mike Heitmann Garney Construction, MO
Milton Keys Indy Water/Veolia, IN
Matthew Klein Veolia/ Citizens Energy, IN
Ed Lambing, PE San Jose Water Co., CA
Jonathan Leung, PE Los Angeles Dept. of Water and Power, CA
George McGuire Ditch Witch, OK
Dr. Ken Oliphant, PEng JANA, ON
Rafael Ortega, PE LAN, TX
Collins Orton TT Technologies, CA
Fred Ostler, PE Joint Powers Water Board, WY
Chad Owens, PE City Utilities, MO
Dr. Larry Slavin OPCS, NJ
Dan Smolik Garney Construction, FL
Serge Terentieff, PE EBMUD, CA
• Denotes others who contributed to development of this document which includes the following non‐MAB members:
Ron Collins JCM Industries, TX
Angelo DuPont City of Arlington, TX
Robert Item, PE City of Palo Alto, CA
Jim Johnston McElroy Manufacturing, OK
Robert Justus City of Palo Alto, CA
Rick Van Kesteren WAGA, NL
Rick Ponder Integrity Fusion, GA
Jeff Wright GF‐Central Plastics, OK
1
FOREWORD
The MAB‐4 Basic HDPE Repair Options document was developed by the
Municipal Advisory Board (MAB) and published with the help of the
members of the Plastics Pipe Institute, Inc. (PPI).
The MAB‐4 Basic HDPE Repair Options is intended as a guide for engineers,
users, contractors, code officials, and other interested parties for use in the
repair of high density polyethylene (HDPE) pressure water piping systems.
The local utility or engineer may need to modify the document to adapt
to local conditions, operations, and practices.
The MAB‐4 Basic HDPE Repair Options were prepared by MAB members
and associates as a service to the water industry. The information in this
document is offered in good faith and believed to be accurate at the time
of its preparation, but is offered “as is” without express or implied
warranties, including WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. Any reference to a specific manufacturer’s
product is merely illustrative, and not intended as an endorsement of that
product. Reference to or testing of a proprietary product should not be
construed as an endorsement by the MAB or PPI, which do not endorse
the proprietary products or processes of any manufacturer. Users are
advised to consult the manufacturer for more detailed information about
the specific manufacturer’s products. The information in this document is
offered for consideration by industry members in fulfilling their own
compliance responsibilities. MAB and the PPI assume no responsibility for
compliance with applicable laws and regulations.
The MAB serves as an independent, non‐commercial adviser to the
Municipal & Industrial (M & I) Division of the PPI. Once adopted, MAB will
consider revising this document from time to time, in response to
comments and suggestions from users. Please send suggestions of
improvements to Camille George Rubeiz, PE, F.ASCE, at
crubeiz@plasticpipe.org.
RECOMMENDATIONS
1. If you are able to eliminate water through the pipe, then fusion should
be the first choice of repair.
2. Squeeze off tools can create dry conditions for fusion.
3. All mechanical couplings should include pull out resistance/restraint
or be used with external restraint clamps when using non‐restraint
mechanical couplings.
4. Internal stiffeners should be used for all mechanical couplings.
5. Corrosion protection should be provided for all underground metallic
fittings.
6. Fabricated fittings should always be at least one SDR thicker than pipe
and have the same Pressure Rating as the pipeline.
7. Illustrations for repair with fabricated fittings are appropriate for molded
fittings.
8. For mechanical connections, contact the fitting manufacturer to verify
that these connections are designed to work specifically with HDPE.
2
Leak Discovered
on HDPE Pipe
FUSION
Determine
Leak Type
≤ 1”
Puncture See Fig. 1,2,3
one pipe Size of Hole
wall
> 1”
Severed
Main
See Fig. 4,5,7
Mechanical Remove fitting and replace with
Fitting appropriate fitting
Remove saddle and replace with EF See Fig. 3 or 5
Mechanical Saddle or replace pipe segment with
Saddle new section and 2 EF couplings
Remove pipe segment with butt See Fig. 4
Butt fusion and install new segment
Fusion with 2 EF couplings
Remove pipe segment with EF See Fig. 4
Electrofusion coupling and install new segment
Coupling with 2 EF couplings
Reheat EF saddle, remove and See Fig. 5
Electrofusion install new EF saddle or remove
Saddle pipe section containing saddle
HDPE Line
Fitting (Tee Ell, Remove leaking fitting See Fig. 6, 8,
Cross, Valve ) and install new fitting with 9, 10
Molded or 2, 3 or 4 EF couplings
Fabricated
See Fig. 11,
Service Line Repair or replace service line 12, 13
(≤ 3")
3
FUSION
Fig. 4 Pipe Section Replacement with Two Electrofusion Couplings Fig. 5 Pipe Section Replacement with Tapping Tee
REPAIRSPOOL WITH MOLDED T
EXISTING HDPE PIPE EXISTING HDPE PIPE
Fig. 6 Section Replacement with Molded Tee Fig. 7 Mechanical Joint (MJ) Adapter w Install Kit
Fig. 8 Fabricated Elbow with Two EF Couplings Fig. 9 Fabricated Tee with Three EF Couplings
Fig. 10 Fabricated Cross with 4 EF Couplings Fig. 11 Service line EF Coupling
Fig. 12 Service Butt Fusion Fig. 13 Service Line Socket Fusion
4
ELECTROFUSION
REPAIR OF LEAKING
SADDLE FUSIONS:
Leaks due to suspect electrofusion saddle joints can
be repaired by removing the leaking connection and
replacing the saddle. A weak or leaking fusion is likely due
to contamination in the fusion zone or the lack of pipe
preparation at the time of initial installation. In such cases, the
saddle can be removed by re‐energizing the heating coil to
the point that the PE material becomes melted and softened.
Once re‐melted, the old saddle can be pulled from the pipe
and a new saddle can be installed in the same location.
PROCEDURE:
Excavate to expose the suspect
saddle and depressurize the
system. Disconnect the service
line and clean the pipe surfaces
immediately surrounding the
suspect saddle.
If the saddle has a “permanent"
clamping device, such as a
bolt‐on strap or plastic
underpart, the clamp must be
removed. Connect the
electrofusion control box to the
suspect saddle and start the
fusion cycle.
5
When the fusion cycle is
complete, immediately pull the
saddle from the pipe. Wear
gloves and use caution to avoid
burns from hot plastic or wires.
Small tapping saddles can
normally be removed by hand,
but if necessary a suitable
rubber mallet may be used to
strike the fitting.
Inspect the pipe surface for
damage. Remnants of PE
material from the saddle will
likely remain on the pipe
surface and can be removed
with a rasp to re‐shape the pipe
curvature. Once the remnants
are removed, the pipe can be
prepared for fusion by
peeling/scraping using
approved procedures. The tap
hole may require that the peeler
blade be manipulated to allow it
to pass over the hole in the pipe
as it revolves over that area.
Place the new fitting over the
tap hole carefully to ensure that
the hole is inside of the fusion
zone boundary. A mandrel or
guide may be inserted into the
tap hole to aid in aligning the
replacement fitting over the
hole. Clamp the fitting in place
and fuse per normal procedures.
Allow the fitting to cool per
normal procedures prior to
removing the clamp,
reconnecting the service line,
and returning to service.
6
Leak Discovered
on HDPE Pipe
MECHANICAL
Determine
Leak Type
Puncture ≤ 1”
Size of Hole See Fig. 14, 15,
one pipe
16, 17, 26
wall
> 1”
Puncture Remove damaged section
and reinstall new pipe with two
both pipe mechanical Pull Out Restraint
See Fig. 18
walls couplings and internal stiffeners
Severed
Main
Mechanical See Fig. 16, 17,
Replace fitting
Fitting 19, 20, 21, 22
Remove section of pipe containing
Butt butt fusion and replace with new pipe See Fig. 18, 24, 26
Fusion section and 2 mechanical Pull Out
Resistant couplings or encapsulate
Remove pipe segment
Electrofusion with EF Coupling, install new pipe See Fig. 18
(EF) Coupling segment with 2 mechanical Pull Out
Resistant couplings
Remove pipe segment containing
Electrofusion EF saddle, install new pipe segment
with 2 mechanical Pull Out Resistant See Fig. 18
(EF) Saddle couplings, install service saddle
on new pipe segment
Line Fitting Remove leaking fitting
and install new fitting with See Fig. 27,
(Tee, Ell, 2, 3 or 4 mechanical Pull Out 28, 29
Cross, Valves ) Resistant couplings
Pull out Cut out appropriate
Mechanical length of existing pipe to fit See Fig. 22
Joint (MJ) new MJ adapter
7
MECHANICAL
EXISTING
HDPE PULL OUT
RESISTANT
MECHANICAL
COUPLING
HDPE
SPOOL
EXISTING
HDPE
EXISTING
HDPE
Fig. 17 Repair Sleeve Flanged Outlet Fig. 18 HDPE Pipe Spool Replacement Fig. 19 HDPE Flange
w Mechanical Couplings
EXISTING
HDPE PULL OUT
RESISTANT
MECHANICAL FABRICATED
FABRICATED COUPLING ELL
TEE
EXISTING
HDPE
PULL OUT EXISTING
RESISTANT HDPE
MECHANICAL EXISTING
COUPLING HDPE EXISTING
HDPE
Fig. 26 Band Clamp capable of Fig. 27 Fabricated Tee Fig. 28 Fabricated Ell
Encapsulating Butt Fusion
8
FOR ADDITIONAL INFORMATION
• MAB-1: MAB Generic Electrofusion Procedure for Field Joining of 12 Inch
and Smaller Polyethylene (PE) Pipe
https://plasticpipe.org/pdf/mab‐generic‐ef‐110515.pdf
• MAB-2: MAB Generic Electrofusion Procedure for Field Joining of 14 Inch
to 30 Inch Polyethylene (PE) Pipe
https://plasticpipe.org/pdf/mab‐02‐generic‐electrofusionn.pdf
• MAB-3: MAB Model Specifications for PE 4710 Buried Potable Water
Service, Distribution and Transmission Pipes and Fittings
https://plasticpipe.org/pdf/mab3.pdf
• MAB-4: MAB Basic HDPE Repair Options
https://plasticpipe.org/municipal_pipe/advisory/repairs/mab4.html
https://plasticpipe.org/municipal_pipe/advisory