Large Diameter Directional Drilling Contractors
Maxi rig HDD specialists with the equipment, crews, and track record to handle the most demanding large diameter pipeline installations in the industry.
What is Large Diameter HDD?
Large diameter horizontal directional drilling (HDD) refers to trenchless pipeline installations typically involving pipe diameters of 24 inches and above, up to 56 inches in NCDD's case. These projects require specialized maxi rig equipment capable of generating the pullback force and torque needed to install heavy, large-diameter pipe through extended underground bore paths.
Large diameter HDD is the preferred method for major pipeline transmission projects, deep river and waterway crossings, and infrastructure installations where open-cut trenching is impractical, prohibited, or too disruptive. It's how critical pipelines get installed under rivers, highways, and environmentally sensitive areas without disturbing the surface.
Not every HDD contractor has the equipment or experience for large diameter work. It requires purpose-built maxi rigs, experienced guidance engineers, and crews who have done it before, at scale. NCDD checks every box.
Still weighing your options? See HDD vs. Open-Cut for an honest breakdown of when trenchless wins on a large crossing.
NCDD Large Diameter Capabilities
56"
Maximum Pipe Diameter
50+
Miles of 42" Pipeline
29
States Drilled In
100%
Completion Rate
When You Need a Large Diameter HDD Contractor
Large diameter directional drilling is required when the scope, environment, or pipe size exceeds standard HDD capabilities.
Pipeline Transmission Projects
Major natural gas, oil, water, and sewer transmission lines requiring 24-inch to 56-inch pipe diameters. These projects demand maxi rig equipment with high pullback capacity and experienced operators.
River & Waterway Crossings
Installing large diameter pipeline under rivers, sounds, bays, and other bodies of water where surface disruption is not permitted. NCDD has completed crossings including the Roanoke Sound and multi-thousand-foot intersect bores.
Environmental & Wetland Crossings
Trenchless installation through environmentally sensitive areas, archaeological sites, and protected wetlands where open-cut trenching is prohibited by regulation or permit conditions.
Highway & Infrastructure Crossings
Large diameter installations under highways, interstates, railroads, and existing infrastructure where surface disruption would impact traffic, commerce, or public safety.
Long-Distance Intersect Bores
Extended-length crossings where two rigs drill toward each other and intersect underground, a technically demanding operation that requires precision guidance and experienced crews. NCDD has completed 10,000+ foot intersect crossings.
Challenging Geology
Large diameter installations through hard rock, cobble, clay, and mixed-face geological conditions that require specialized tooling, mud systems, and operational expertise most contractors can't provide.
Why Choose NCDD for Large Diameter HDD?
When the pipe is big, the crossing is long, and failure isn't an option, you call NCDD.
Maxi Rig Fleet
Purpose-built large diameter drilling equipment with the pullback force, torque, and mud systems required for the largest pipeline installations, up to 56-inch.
80+ Years Combined Leadership Experience
Our management team has been doing this since before most contractors were founded. Over 50 miles of 42-inch pipeline installed, and counting.
100% Completion Rate
Every crossing under contract completed. We have never walked away from a difficult bore, no matter the geology, the distance, or the complexity.
In-House Guidance Engineering
Experienced guidance engineers who have worked both sides of the operation, superintendent and downhole navigation, for precise, on-target drilling.
All Geological Conditions
Hard rock, cobbles, clay, sand, mixed-face. Our tooling and mud systems are built for the conditions other contractors turn down.
Nationwide Mobilization
Crews and equipment that mobilize across 29 states. Wherever the project is, we get there and get it done.
Featured in Trenchless Technology
NCDD's large diameter HDD work has been recognized by the industry's leading publication.
Need a Large Diameter HDD Contractor?
From 24-inch to 56-inch pipeline, NCDD has the maxi rig equipment, experienced crews, and proven track record to get your large diameter project done right.
Serving 29 states. See our HDD service areas →