www.fischer-harris.com

Transcription

EBAA Iron
Joint Restraint Design and
Applications for
Ductile Iron and PVC Pressure Pipe
Jeff Fischer
Fischer, Harris and
Associates
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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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EBAA Iron
Restraint Needs
Ductile Iron “Push On”
7/24/2012
Restraint Needs
PVC 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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EBAA Iron
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Restrain Needs
“Mechanical Joint”
7/24/2012
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EBAA Iron
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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EBAA Iron
Joint Restraint
…why do we use it?
Balanced Force
Unbalanced Force
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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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EBAA Iron
How do we resist that force?
1. Concrete Thrust Blocks
2. Mechanical Restrainers
(Megalugs)
3. Combinations
of the above
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F i s c h e r, H a r r i s & A s s o c i a t e s
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EBAA Iron
Thrust Block Limitations
Undisturbed soil?
Contractor skill?
Future connections?
Concrete cure time?
Vertical offsets?
Sand and Swamp?
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“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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EBAA Iron
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 Length
www.ebaa.com
L
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EBAA Iron
Pipe Joint Restraint
Devices for DIP
Retainer Glands
Pipe Company “built-ins”
Wedge Action
Restrainers
Others: Friction Clamps, One Bolt,
Serrated Grippers
7/24/2012
Pipe Companies Restraints
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US Pipe
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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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EBAA Iron
Non-Pipe Company
Mechanical Restrainers
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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!
7/24/2012
How many joint restraint devices
are on the market?
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EBAA Iron
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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EBAA Iron
3. Reliable and
Repeatable
Installations
Friction can interfere with the
contact pressure of the wedge to pipe interface
if the threaded parts are corroded or coated with
thick asphaltic coatings
Stainless Steel
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EBAA Iron
Megabond coating will
lubricate the threads creating a reliable wedge to
pipe contact area.
TM
Fluorocarbon coating
Threaded Parts
4. Country of Origin
Megalugׂ◌
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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EBAA Iron
Mechanical Joint Restraint for DI Pipe
Allows for
deflection
during and
after assembly
Megalug Restraint-Proven Wedge Action
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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EBAA Iron
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
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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EBAA Iron
Bell Stress Research
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.”
Assembly Force
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EBAA Iron
Recommended Bar Assembly
Next Joint Back?
Even this method can over-insert
previously assembled joints
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EBAA Iron
Mega-Stop
7/24/2012 11:30 AM
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EBAA Iron
Restraint Harness for
Push on PVC or DIP Bells
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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EBAA Iron
Mega-Sleeve
Restrained 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
7/24/2012
Cast/Grey Iron Pipe Restraint
Use 1100 series Megalug bored out
Needs to be structurally sound pipe
7/24/2012
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EBAA Iron
Polyethylene Pipe
Restraint Considerations
Expansion, Contraction and the Poisson effect can cause
significant pipe movement.
Existing Joints
SPLIT MEGALUG ®
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EBAA Iron
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 ) Old Style
TM
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EBAA Iron
Restrained Flange Adapters
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Megaflange
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EBAA Iron
Flextend®
Flextend®
For Bridge Crossings, tank connections or Unstable Soil
areas
7/24/2012
Team Industrial Insert Valves
• Fully insertable without shut
down
• Fully functional AWWA
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7/24/2012
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
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EBAA Iron
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EBAA Iron
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EBAA Iron
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www.fischer-harris.com

Transcription

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