Pipe Bursting Project Considerations

PROJECT CONSIDERATIONS PIPE BURSTING

WHAT MATERIALS CAN BE BURST? Fracturable Pipes Cast iron, clay tile, concrete, reinforced concrete, asbestos cement, etc. Non-fracturable Pipes Ductile iron, steel, galvanized (require use of specialized tooling and static bursting machines.PROJECT CONSIDERATIONS

IPBA PROJECT CLASSIFICATIONProject classifications per IPBA (International Pipe Bursting Association) pipe bursting specification.PROJECT CONSIDERATIONS

UPSIZING: A CLOSER LOOKNote: Illustration assumesflow line remains the same.PROJECT CONSIDERATIONS

UPSIZING – EXPANSION (WHERE IT GOES) Approximately 90% of compaction occurs upwards from the existing line.PROJECT CONSIDERATIONS

UPSIZING AND DEPTH• Has flow monitoring been completed?• Is upsizing necessary if I/I is eliminated?• A minimum of 4’ (1.2m) of cover should be used when upsizing one size• Greater cover should be used if upsizing more than one sizeNote: any compaction recedes over time.The deeper the line, the less chance of surface disruption.PROJECT CONSIDERATIONS

DEPTH OF COVERGeneral rule is one (1) foot ofcover for every inch of expansion 8” DIPS Burst Head Expander OD – 11.50” 6” Clay Pipe Existing Pipe ID – 5.94”PROJECT CONSIDERATIONS

SOIL CONDITIONSPROJECT CONSIDERATIONS

WHAT SURROUNDS THE EXISTING PIPE?• Sand?• Clay?• Rock?• Voids from exfiltration?PROJECT CONSIDERATIONS

GOING THE DISTANCE• Static Energy • Pipe Friction •Increase Winch Pulling Pressure •Lubrication (20 Tons) •Tractor Effect• Impact Energy •Entry Pit Length –Use the largest Hammer for the job• Soil Memory –Race against timePROJECT CONSIDERATIONS

DEPTH OF EXISTING LINE• Entrance and exit pit depths?• Can we dig an entry pit? –Entry pit length is minimum 2 ½ times depth –With pipes larger than 12” diameter length of entry pit will increase• Can we manhole exit? –8, 10 & 12” single upsize• Can we dig an exit (receiving) pit?PROJECT CONSIDERATIONS

LENGTH OF BURST• How Long is the Burst? –Bypass Needed? –Number of Services? –Has One Call been Contacted? –How Close are the are the other Utilities?PROJECT CONSIDERATIONS

NEW PIPE QUESTIONS• What kind of new pipe?• IPS or DIPS? (OD) –Important for burst head adaptability –Existing clay to DIPS is a single upsize• What is the SDR Rating –Recommend a minimum of SDR17 for pipe bursting with HDPEPROJECT CONSIDERATIONS

NEW PIPE MATERIAL• HDPE is preferred pipe when pipe bursting• Fusible PVC, Terrabrute, Ductile and Clay have been used successfully but require additional project and site considerations.PROJECT CONSIDERATIONS

FLOW COMPARISONS: HDPEPROJECT CONSIDERATIONS

Use of Lubrication (Lube Manifold) Large or long bursts: lubrication can increase production and the bursting distance capability Small Dia. Medium Dia. Large Dia. Large Dia.(6”-10”) Good Soil (12-16”) Poor Soil (16” and larger)PROJECT CONSIDERATIONS

Current Video Available• Current video is very important• Scenario: We have a video, but it is 2 years old.• Problem: What has happened to the line in the last 2 years. –Point repair on clay line with ductile repair section and steel bandsPROJECT CONSIDERATIONS

Current Video• Is there a dip in the line?• Is there a swell in the line?• Is a point repair needed prior to bursting?PROJECT CONSIDERATIONS

Common questions• What about pipe scratches on the new HDPE• How do you go around bends• What about damage to other utilities with the expansion that takes place• Our plans are bad for old lines, how do you deal with this• How does the equipment work if there is a line repair• How long can you burst• How big can you burstPROJECT CONSIDERATIONS

Common questions• We need to chlorinate the pipe after it is installed and wait 2 days to hook people back on service• How do you connect to existing pipe materials and services• Who around here is doing this, I don’t want to be first• How much does the equipment cost• I am concerned about taking the risk of trying something new and don’t want the responsibilityPROJECT CONSIDERATIONS

System Selection• Pneumatic systems• Static systems• Impactor systems• Compact systemsPROJECT CONSIDERATIONS

THANK YOU FIRST NAME LAST NAME PRESENTER TITLE E: info@hammerheadmole.com P: 800.331.6653 | INT: +1.262.567.8833 | F: 262.567.5068 W: www.hammerheadtrenchless.com

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Pipe Bursting Project Considerations

by HammerHead Trenchless Equipment on Jun 18, 2012

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