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EBAA Iron
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Joint Restraint Design and
Applications for
Ductile Iron and PVC Pressure Pipe
Jeff Fischer
Fischer, Harris and
Associates
www.fischer-harris.com
www.fischer-harris.com
• EBAA Iron, Joint Restraint and Expansion Joints• Smith Blair, Pipe Connections and Repair• Manhole and Culvert Pipe Rehabilitation• Insertable Mechanical Joint Valves• Manhole Chimney Seals• Low maintenance Air Release Valves and Pinch Valves• Ultra Efficient Nozzle Style Check Valves
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Restraint NeedsDuctile Iron “Push On”
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Restraint NeedsPVC Pressure Pipe “Push On”
AWWA C-900
AWWA C-905
AWWA C-909
ASTM SDR 26
ASTM SDR 21
ASTM SDR 17
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Restrain Needs“Mechanical Joint”
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Standard Pipe Joints“Mechanical Joint”
AWWA/ANSI C153/A21.53 -- American National Standard for Ductile-Iron Compact Fittings for
Water Service
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Need for Restraint“Flanged Joint”
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Joint Restraint…why do we use it?
Balanced Force
Unbalanced Force
How much force is generated by a 6” pipe?
• Pi x Cross Sectional Area in inches (radius squared) x PSI
• 3.14 x 3.5 squared= 11 x 150 = 1,650 pounds of force
• 12” =1,7000
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How do we resist that force?
1. Concrete Thrust Blocks2. Mechanical Restrainers (Megalugs)
3. Combinations of the above
Fischer, Harr is & Associat es
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Thrust Block Limitations
�Undisturbed soil?
�Contractor skill?
�Future connections?
�Concrete cure time?
�Vertical offsets?
�Sand and Swamp?
Fischer, Harr is & Associat es
“Mechanical Restrainers” Defined…
Fischer, Harr is & Associat es
Locking a pipe/fitting
joint(s) together with a
mechanical device
designed to withstand
pressures higher than
normally expected to
insure there will be no pull
out at line pressure plus
an allowance for surge.
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If you lock together a sufficient
length of pipe, the passive and
frictional resistance of the soil
prevents the pipe from coming
apart.
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Calculating Restrained Lengthwww.ebaa.com
Fischer, Harr is & Associat es
L
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Pipe Joint Restraint Devices for DIP
�Retainer Glands
�Pipe Company “built-ins”
�Wedge Action Restrainers
�Others: Friction Clamps, One Bolt, Serrated Grippers
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Pipe Companies Restraints • US Pipe
� TR Flex� Field Lok� Field Lok 350� HD Lok
• Pac States - Thrust Lock• Clow - Super Lock• ACIPCO
� Fastite� Flex Ring� Lock Ring� Fast Grip� Field Flex Ring� MJ Coupled Joint
• Griffin � Snap Lok� Mech Lok� Bolt Lok
All trademark names
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Certa-Lock
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Non-Pipe Company Mechanical Restrainers
• EBAA Iron - Megalug
• Ford - Blockbuster
• Star – Stargrip
• Romac – Romagrip
• Sigma – One Lock
• Mueller – AquaGrip
• Tyler – MJ Field Lock
• JCM – 600 Series
• Smith Blair - Maxi Grip
• Sigma - PV Loc
• Romac – Grip Ring
• And more!
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How many joint restraint devices are on the market?
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Standard Assembly Procedures
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2. Quality Ductile Iron Ductile Iron is a composite metal that has special properties
• Reputable Single Source Foundry• Proof of Metallurgy Available on Request
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3. Reliable and RepeatableInstallations
Friction can interfere with the contact pressure of the wedge to pipe interfaceif the threaded parts are corroded or coated with
thick asphaltic coatings
Stainless Steel
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MegabondTM coating willlubricate the threads creating a reliable wedge to
pipe contact area.
Fluorocarbon coating
Threaded Parts
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4. Country of Origin
Megalug ׂ◌
100% Made in USA
Megalug-a-look-a-likes
CASTING or wedges are outsourced, mostly to China.
CHINA does not mean
“Cast Here In North America”
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Megalug Restraint-Proven Wedge Action
Mechanical Joint Restraint for DI Pipe
Allows for
deflection
during and
after assembly
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Megalug ® Series 1100
for Ductile Iron Pipe
� Color Coded - Black Body, Blue Wedges
� Installation ease - Use AWWA C-600 to make seal then twist off lug bolt heads to restrain.
� Quality - Made in USA- Date and Production Coded-Proof of Metallurgy on Every Product
� Strength - 350 psi through 16” 250 above that
� Reliability -Standard MEGABOND coating including Xylan Coated Threaded Parts.
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Megalug for PVC Pipe
Mechanical Joint Restraint PVC Pipe
Wedges designed specifically for PVC pipe
Can be used on C900/905 and IPS but not C909
Megalug ® for PVC pipe
Inspection Tips
• Brown color indicates PVC• Use product “as is” for C-900• Remove Washer for use on IPS and use a transition gasket
• Install using AWWA C-600 techniques then snap off lug bolt heads
• If reusing, tighten until lug bottoms out• Also known as series 2000 (marked EBAA IRON)
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Longitudinal Mechanics of Buried Thermoplastic Pipe: Analysis of PVC Pipes of Various Joint Types
Shah Rahman , Vice President – Technical Services, S&B Technical Products/Hultec
Reynold K. Watkins , Professor Emeritus , Utah State University
“The issue of over-insertion has been one of the most prevalent problems with gasket joint PVC pipes. Numerous pipeline failure analyses have been traced back to excessive stresses on the bell as result of over-insertion. Installers should be aware of the detrimental consequences of this practice.”
Bell Stress Research
Assembly Force
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Recommended Bar Assembly
Next Joint Back?
Even this method can over-insert
previously assembled joints
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Restraint Harness forPush on PVC or DIP Bells
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Used when calculated
restrained distance “L” is
greater than pipe length
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Plain End Pipe to Pipe Connection
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Mega-SleeveRestrained Mechanical Joint Sleeve for
Ductile Iron, PVC and HDPE Pipe
-Restrained sleeve that provides pull-out resistance up to the rated pressure of the pipe-Fusion bonded epoxy body coated Megalugs-Safety factor of 2-1
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Cast/Grey Iron Pipe Restraint
�Use 1100 series Megalug bored out
�Needs to be structurally sound pipe
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Polyethylene PipeRestraint Considerations
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Expansion, Contraction and the Poisson effect can cause
significant pipe movement.
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Existing JointsSPLIT MEGALUG ®®®®
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Mega-flange®
Restrained Flange Adaptor
�Pipe can be cut to length in the field
�Easy to assemble/disassemble
�Pipe need not be cut perfectly square
�Deflection up to 5%
�Can use above or below ground
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Flange Coupling Adapter (Uni-Flange TM) Old Style
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Restrained Flange Adapters
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Megaflange
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FlextendFlextendFlextendFlextend®®®®For Bridge Crossings, tank connections or Unstable Soil areas
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• Fully insertable without shut down
• Fully functional AWWA compliant resilient wedge gate valve.
• Installs in 1-2 hours
• Installation crews located throughout the US
• All Ductile Iron Design
• Epoxy Coated per AWWA standards
• 4”-8” now available. 10” and 12” in 2011
Team Industrial Insert Valves