pipe bursting project considerations

PROJECT CONSIDERATIONS

PIPE BURSTING

WHAT MATERIALS CAN BE BURST?


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

UPSIZING: A CLOSER LOOK


Note: Illustration assumesflow line remains the same.

UPSIZING – EXPANSION (WHERE IT GOES)


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


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


General rule is one (1) foot of cover for every inch of expansion

SOIL CONDITIONS


• Sand?• Clay?• Rock?• Voids from exfiltration?

WHAT SURROUNDS THE EXISTING PIPE?


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


• 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


• 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


• 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


• 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


FLOW COMPARISONS: HDPE


Large or long bursts: lubrication can increase production and the bursting distance capability

Use of Lubrication (Lube Manifold)


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


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

Current Video


• 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


• 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


• Pneumatic systems• Static systems• Impactor systems• Compact systems

System Selection


THANK YOU

E: [email protected]: 800.331.6653 | INT: +1.262.567.8833 | F: 262.567.5068W: www.hammerheadtrenchless.com

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pipe bursting project considerations

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burstproject considerations

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