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PROJECT CONSIDERATIONS
PIPE BURSTING
WHAT MATERIALS CAN BE BURST?
PROJECT CONSIDERATIONS
Fracturable PipesCast iron, clay tile, concrete, reinforced concrete, asbestos cement, etc.
Non-fracturable PipesDuctile iron, steel, galvanized (require use of specialized tooling and static bursting machines.
IPBA PROJECT CLASSIFICATION
PROJECT CONSIDERATIONS
Project classifications per IPBA (International Pipe Bursting Association) pipe bursting specification.
UPSIZING: A CLOSER LOOK
PROJECT CONSIDERATIONS
Note: Illustration assumesflow line remains the same.
UPSIZING: A CLOSER LOOK
PROJECT CONSIDERATIONS
Note: Illustration assumesflow line remains the same.
UPSIZING: A CLOSER LOOK
PROJECT CONSIDERATIONS
Note: Illustration assumesflow line remains the same.
UPSIZING: A CLOSER LOOK
PROJECT CONSIDERATIONS
Note: Illustration assumesflow line remains the same.
UPSIZING – EXPANSION (WHERE IT GOES)
PROJECT CONSIDERATIONS
Approximately 90% of compactionoccurs upwards from the existing line.
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 size
PROJECT CONSIDERATIONS
Note: any compaction recedes over time.The deeper the line, the less chance of surface disruption.
8” DIPS Burst HeadExpander OD – 11.50”
6” Clay PipeExisting Pipe ID – 5.94”
DEPTH OF COVER
PROJECT CONSIDERATIONS
General rule is one (1) foot of cover for every inch of expansion
SOIL CONDITIONS
PROJECT CONSIDERATIONS
• Sand?• Clay?• Rock?• Voids from exfiltration?
WHAT SURROUNDS THE EXISTING PIPE?
PROJECT CONSIDERATIONS
GOING THE DISTANCE
• Static Energy•Increase Winch Pulling Pressure(20 Tons)
• Impact Energy–Use the largest Hammer for the job
• Soil Memory –Race against time
• Pipe Friction•Lubrication•Tractor Effect•Entry Pit Length
PROJECT CONSIDERATIONS
• 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?
DEPTH OF EXISTING LINE
PROJECT CONSIDERATIONS
• How Long is the Burst?–Bypass Needed?–Number of Services?–Has One Call been Contacted?–How Close are the are the other Utilities?
LENGTH OF BURST
PROJECT CONSIDERATIONS
• 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 HDPE
NEW PIPE QUESTIONS
PROJECT CONSIDERATIONS
• HDPE is preferred pipe when pipe bursting• Fusible PVC, Terrabrute, Ductile and Clay have been used successfully but
require additional project and site considerations.
NEW PIPE MATERIAL
PROJECT CONSIDERATIONS
FLOW COMPARISONS: HDPE
PROJECT CONSIDERATIONS
FLOW COMPARISONS: HDPE
PROJECT CONSIDERATIONS
Large or long bursts: lubrication can increase production and the bursting distance capability
Use of Lubrication (Lube Manifold)
PROJECT CONSIDERATIONS
Small Dia. (6”-10”) Good
Soil
Medium Dia.
(12-16”)
Large Dia. (16” and larger)
Large Dia.
Poor Soil
• 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 bands
Current Video Available
PROJECT CONSIDERATIONS
• Is there a dip in the line?• Is there a swell in the line?• Is a point repair needed prior to bursting?
Current Video
PROJECT CONSIDERATIONS
• 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 burst
Common questions
PROJECT CONSIDERATIONS
• 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
responsibility
Common questions
PROJECT CONSIDERATIONS
• Pneumatic systems• Static systems• Impactor systems• Compact systems
System Selection
PROJECT CONSIDERATIONS
THANK YOU
E: [email protected]: 800.331.6653 | INT: +1.262.567.8833 | F: 262.567.5068W: www.hammerheadtrenchless.com
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