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1 Joint Restraint Design and Applications for Ductile Iron and PVC Pressure Pipe Jeff Fischer Fischer, Harris and Associates 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 1
2 Restraint Needs Ductile Iron Push On 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 2
3 Restrain Needs Mechanical Joint 3
4 Standard Pipe Joints Mechanical Joint AWWA/ANSI C153/A American National Standard for Ductile-Iron Compact Fittings for Water Service Need for Restraint Flanged Joint 4
5 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 5
6 How do we resist that force? 1. Concrete Thrust Blocks 2. Mechanical Restrainers (Megalugs) 3. Combinations of the above Fischer, Harris & Associat es Fischer, Harris & Associat es 6
7 Thrust Block Limitations Undisturbed soil? Contractor skill? Future connections? Concrete cure time? Vertical offsets? Sand and Swamp? Fischer, Harris & Associat es 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. Fischer, Harris & Associat es 7
8 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 Length L Fischer, Harris & Associat es 8
9 Pipe Joint Restraint Devices for DIP Retainer Glands Pipe Company built-ins Wedge Action Restrainers Others: Friction Clamps, One Bolt, Serrated Grippers Fischer, Harris & Associat es 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 Fischer, Harris & Associat es 9
10 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! Fischer, Harris & Associat es How many joint restraint devices are on the market? 10
11 Standard Assembly Procedures Fischer, Harris & Associat es 2. Quality Ductile Iron Ductile Iron is a composite metal that has special properties Reputable Single Source Foundry Proof of Metallurgy Available on Request 11
12 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 12
13 Megabond coating will TM lubricate 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 13
14 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 psi through above that Reliability -Standard MEGABOND coating including Xylan Coated Threaded Parts. 14
15 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) 15
16 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 16
17 Recommended Bar Assembly Next Joint Back? Even this method can over-insert previously assembled joints 17
18 Mega-Stop 7/24/ :30 AM 36 18
19 Restraint Harness for Push on PVC or DIP Bells Used when calculated restrained distance L is greater than pipe length Fischer, Harris & Associat es Plain End Pipe to Pipe Connection 19
20 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 Cast/Grey Iron Pipe Restraint Use 1100 series Megalug bored out Needs to be structurally sound pipe 20
21 Polyethylene Pipe Restraint Considerations Expansion, Contraction and the Poisson effect can cause significant pipe movement. Fischer, Harris & Associat es Existing Joints SPLIT MEGALUG 21
22 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 Fischer, Harris & Associat es 22
23 Restrained Flange Adapters Megaflange 23
24 Flextend For Bridge Crossings, tank connections or Unstable Soil areas Team Industrial Insert Valves 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
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