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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

7/24/2012 Fischer, Harris & Associates

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Restraint NeedsDuctile Iron “Push On”


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


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

7/24/2012 Fischer, Harris & AssociatesFischer, 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?


“Mechanical Restrainers” Defined…


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.


Calculating Restrained Lengthwww.ebaa.com


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



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


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!



How many joint restraint devices are on the market?

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7/24/2012 Fischer, Harris & AssociatesFischer, Harr is & Associat es

Standard Assembly Procedures


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


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


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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Mega-Stop

7/24/2012 11:30 AM 36

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Restraint Harness forPush on PVC or DIP Bells


Used when calculated

restrained distance “L” is

greater than pipe length


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


Cast/Grey Iron Pipe Restraint

�Use 1100 series Megalug bored out

�Needs to be structurally sound pipe

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Polyethylene PipeRestraint Considerations


Expansion, Contraction and the Poisson effect can cause

significant pipe movement.


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


Flange Coupling Adapter (Uni-Flange TM) Old Style


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Restrained Flange Adapters


Megaflange

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FlextendFlextendFlextendFlextend®®®®For Bridge Crossings, tank connections or Unstable Soil areas


• 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

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joint restraint design and applications for ductile iron ...c.ymcdn.com/sites/ · pdf...

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