Q: How much has pneumatic pipe bursting grown over the last few years?A: Many advances have been made in pneumatic pipe bursting over the years allowing it to be successfully used with many

different types of pipe, in an almost endless number of situations. In North America alone, over one million feet of pipewas replaced in 2001 using this highly effective method.

Q: Does static bursting offers advantages over other types of bursting?A: Static pipe bursting is unique because it provides contractors the means to burst and replace ductile iron and steel pipe,

a limitation of pneumatic bursting. Recent advancements in cutting head technology have made this possible. This isexciting news for gas and water utilities with miles and miles of these pipes that need to be upgraded and replaced.

Q: How much bursting work has been done with mechanical HDD type bursting units?A: Since their introduction in 1989, these types of HDD related bursting tools have met limited success, mostly due to

difficulty in maintaining line and grade during bursting operations. There are special situations however where these toolscan be effectively used to replace short sections of failing pipe in difficult working conditions.

Q: What types of bursting equipment does TT Technologies offer?A: TT Technologies offers all three major types of pipe bursting equipment, including parts, accessories and unmatched

technical experience and expertise. In addition, TT Technologies offers complete lines of pipe ramming, piercing tool anddirectional drilling equipment. Each piece of equipment is backed by over 35 years of trenchless experience.

TT Technologies,Inc.

2020 E New York Street • Aurora, IL 60504 • 1-800-533-2078 • 1-630-851-8200 • FAX 1-630-851-8299

www. tttechnologies .com • E-Mail info@tttechnologies .com

Questions & AnswersAbout Pipe Bursting

Pipe BurstingMethods:

BENEATH THE SURFACE

STATIC Pipe Bursting

PNEUMATICPipe Bursting

TT Technologies,Inc.

METHOD USAGE COMPARISON

Usage determined from 20 years of field experience.

HDD MechanicalPipe Bursting

Know the FactsPneumatic pipe bursting has been successfully used worldwide for over 20 years. During that time it hasdeveloped in to a major trenchless pipe replacement method. Literally millions of feet of failing sewer, water,gas and other infrastructure pipelines have been replaced through this established method. Countlessmunicipalities, businesses and residences have benefited from pipe bursting.

A Look

• Extremely difficult to maintain line and grade

• Limited in the types of burstable pipes• Burstable pipe diameters limited• Diameter upsize potential limited• Point repairs, joints & clamps will stop drill bursting• Invert line-up in manholes difficult • Manhole repairs from HDD entry create confined space issues• Requires extended setback from starting point• High number of moving parts leads to excessive factory performed maintenance• Substantial minimum investment required• Requires directional drill • Rental equipment not readily available • Specialized labor required and critical to success• Requires certified drill operator• Bentonite design creates potential for lateral back ups and host pipe deterioration• Bentonite not acceptable in potable water lines• Method largely unsuccessful

• Tool follows existing pipe path, guided by a constant tension winch to maintain optimum line and grade

• Wide range of burstable pipe material including clay, PVC, RCP, ACP, Cast Iron & more• Burstable pipe diameters range from 4 inches through 54 inches• Upsizes of 100% or more possible• Accessories available to overcome point repairs, clamps and joints• Most bursting done manhole to manhole without invert problems

• Regular maintenance after 300 to 400 hours of operation • Rental equipment available

• Equipment can be used by general contractors

• Bentonite usage specifically geared to enhance bursting operations

• Pneumatic pipe bursting successfully used for over 20 years • Millions of feet replaced since 1980

Advantages of Disadvantages of

Pipe bursting equipment is very versatile. In many cases, the same equipment used in pneumatic pipe bursting can be used for trenchless pipe ramming. The directional drill bursting method places excessive stress on drill stems, resulting in fatigue and premature drill stem replacement.

PNEUMATIC Pipe BurstingPneumatic pipe bursting is far and away the most widely used of the threetypes of bursting. The method is simple. A pneumatic bursting tool isguided through a fracturable host pipe by a constant tension winch. Asthe tool travels through the pipe, its percussive action effectively breaksapart the old pipe and displaces the fragments into the surrounding soil.The new pipe, usually HDPE, is pulled in simultaneously.

STATIC Pipe BurstingDuring the static bursting process, specially designed bladed rollers arepulled through an existing line by a hydraulically powered bursting unit.As the bladed rollers are pulled through, they split the host pipe. Anexpander attached to the rollers forces the fragmented pipe into the surrounding soil while simultaneously pulling in the new pipe.

MECHANICAL HDD Bursting/Backreaming Mechanical bursting tools were developed in the late 1980s to be used incombination with horizontal directional drilling units. The goal was toincrease the capabilities of directional drill rigs, making them useful inother markets. These bursting tool heads are attached to the end of a drillstring and pulled back through a host pipe. The bursting tool is usuallypowered by compressed air delivered through the drill stem or by the rotational torque of the drill stem.

Make the Right Choice: Pipe bursting can be broken down into several main categories: pneumatic, static and mechanical.

c •o •m •p •a •r •eRISK/CAUTION!

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PROVEN!

PROVEN!

PROVEN!

Mechanical HDD Bursting/BackreamingPneumatic & Static Pipe Bursting