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Three HDD drilling rigs of different size classes lined up on a pipeline spread at dusk

Mini, Midi and Maxi HDD Rigs: How to Classify and Select Drilling Equipment

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HDD rig sizes are three capability classes – mini, midi and maxi – and choosing between them is a selection method: estimate the load the crossing imposes, compare it with the pullback, thrust and torque envelope of each class, then keep a margin. Here, HDD means horizontal directional drilling for pipeline crossings. This guide explains

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Microtunneling definition illustrated by a surface control cabin, laser guidance and jacking frame

The Four Defining Rules of Microtunneling: Remote Control, Guidance, Pipe Jacking and Face Support

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A practical microtunneling definition is four operating rules applied together: remote control from the surface with no man entry, active guidance that holds line and grade, pipe jacking as the lining method, and face support that balances the ground at the cutterhead. A drive that meets all four is microtunneling; a drive that meets three

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Editorial cover image for the history of microtunneling, from early-1970s Japan to modern global trenchless standards

The History of Microtunneling: From 1970s Japan to a Global Trenchless Standard

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The history of microtunneling begins in early-1970s Japan, where engineers needed to install and replace gravity sewers under congested city streets without cutting them open. It spread across Europe and the United Kingdom through the 1970s and 1980s, reached North America in the early 1980s, and matured into a standards-based method. The first North American

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Microtunneling drive from launch shaft to reception shaft shown in a cutaway engineering illustration

How Does Microtunneling Work? Step-by-Step From Shaft Excavation to Breakthrough

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The short answer to how does microtunneling work is this: a remotely controlled, guided boring machine is jacked through the ground from a launch shaft to a reception shaft, excavating and supporting the face while the permanent pipe string is pushed in behind it, so the pipe becomes the finished tunnel lining. The sequence runs

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Microtunneling terminology glossary cover showing a microtunnel boring machine in a launch shaft

Microtunneling Terminology: 30 Terms Owners, Engineers and Bidders Should Know

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This working microtunneling glossary defines the microtunneling terms owners, engineers and bidders meet most often in specifications and tender documents. The entries run from the method and system names through machine and face, guidance, jacking and thrust, to shafts, pipe, settlement and commercial terms. Definitions follow the usage in ASCE/CI 36-15 and the Pipe Jacking

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Microtunneling versus conventional tunneling comparison overview

Microtunneling vs. Conventional Tunneling: When Does a Small Bore Stop Being “Micro”?

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Microtunneling vs conventional tunneling is decided by the system, not by a diameter: the drive is remotely controlled, no person enters the bore, the jacked pipe becomes the permanent lining, and the machine is small enough that the whole drive is unmanned. Once a crew must go underground to inspect, intervene at the cutterhead or

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Slurry, pilot tube and auger microtunneling systems compared at a trenchless pipe jacking site

Slurry vs. Pilot Tube vs. Auger Microtunneling: How the Three Systems Differ

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Slurry microtunneling, pilot tube microtunneling and auger microtunneling are the three system families used for remotely operated, non-man-entry pipe jacking. They differ in three places: how each supports the face, how the drive is guided, and how spoil leaves the drive. Slurry microtunneling closes and pressurizes the face with a bentonite slurry; pilot tube systems

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Microtunneling drive between two shafts with a remotely controlled machine and jacked pipe

What Is Microtunneling? Definition, Diameter Range and How the Method Works

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What is microtunneling? Microtunneling is a remotely controlled, guided pipe jacking method that installs a pipeline or utility tunnel between two shafts without a person entering the drive. A machine excavates behind a supported face, a jacking frame pushes pipe behind it, and guidance holds line and grade (also called line and level) from a

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Horizontal directional drilling rig at a pipeline crossing site with risk planning documents in the foreground

HDD Risks and How to Minimize Them on Pipeline Jobs

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HDD risks are the physical, financial and regulatory exposures that can turn a horizontal directional drilling crossing into a schedule and cost problem, and minimizing them starts with a written risk register that spans the whole project life cycle. This guide organises the main hazards into seven families, from geotechnical surprises to commercial overruns. It

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HDD guidance system comparison showing a walkover locator, a downhole survey tool and a gyro steering tool

HDD Guidance Systems: Walkover vs. Wireline Gyro Steering

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An HDD guidance system (horizontal directional drilling) is the set of downhole sensors, data paths and surface equipment used to place a pilot bore where the design says it belongs. Choosing between walkover, downhole magnetic and gyro steering is an accuracy-budget decision. Steering, surveying and tracking are often delivered by different tools, and their errors

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