Transmission Pipelines

Built to Perform. Trusted to Deliver.

At R.L. Coolsaet Construction, we specialize in the construction of high-performance transmission pipelines that form the backbone of North America’s energy infrastructure. From cross-country and inter-city gas and product lines to gathering systems and well hookups, our team brings unmatched experience, precision, and commitment to every project.

With almost 90 years of industry leadership, we’ve successfully delivered pipeline systems that safely transport vital energy resources across hundreds of miles — helping utility companies, midstream operators, and energy providers meet growing demands and regulatory standards.

Our Transmission Pipeline Capabilities

Whether you’re expanding an existing system or constructing a new line from the ground up, we provide a full range of services to support your project from start to finish.

We construct large-diameter pipelines that move natural gas, crude oil, and refined products across long distances — through cities, rural areas, and challenging terrains. Our team handles every aspect of cross-country and regional pipeline development, including:

  • Right-of-way (ROW) clearing and grading

  • Trenching, stringing, and welding

  • Bending, lowering-in, and backfilling

  • Road, waterbody, and rail crossings

  • Tie-ins, testing, and commissioning

We coordinate closely with stakeholders, landowners, and regulators to ensure every mile is built to the highest safety and environmental standards.

1.Cross-Country and Inter-City Pipelines

2.Gathering Lines and Well Hookups

Our crews are also experienced in building gathering systems that connect production wells to processing facilities or main transmission lines. These systems are critical for upstream and midstream operations, and we ensure they are constructed with minimal disruption and maximum efficiency.

  • Small to mid-diameter pipeline installation

  • Manifold and header fabrication

  • Flowline tie-ins

  • Metering and valve station setups

  • Compressor and pump station connectivity

Whether you’re working in a metropolitan area, oilfield, or rural gas basin, we deliver safe, timely, and cost-effective pipeline connections that keep your operation moving.

3.Pipeline Replacement and Relocation

Aging infrastructure, compliance issues, or new developments may require sections of your pipeline to be replaced or relocated. We have the expertise to remove and replace lines while minimizing downtime and ensuring operational continuity.

Our team manages:

  • Decommissioning and safe removal

  • New line installation and connection

  • Anomaly digs and repair

  • ROW re-routing and restoration

All work is performed with strict adherence to PHMSA, DOT, and client-specific standards.

4.Hydrostatic Testing & Commissioning

Before a pipeline can go into service, it must pass a strength test. We provide comprehensive hydrostatic &; nitrogen testing services to ensure structural integrity and regulatory compliance.

Inline cleaning and pigging

  • Filling and pressurizing pipelines

  • Inline cleaning and pigging

  • Test monitoring and reporting

  • De-watering and drying

  • System flushing and commissioning

We bring all the equipment, personnel, and experience needed to complete testing safely and efficiently.

5.Integrity Services and Maintenance

Long-term performance depends on ongoing maintenance. We perform integrity digs, coating repairs, valve replacements, and more to extend the life of your pipeline and reduce risk.

Services include:

  • In-line inspection (ILI) support

  • Anomaly excavation and remediation

  • Pipeline recoating and sleeve installation

  • Valve station upgrades and replacements

  • Emergency leak response and repair

With our skilled crews and rapid mobilization capabilities, we’re ready when you need us — 24/7.

Safety Is Our Foundation

Pipeline construction demands the highest levels of safety, and at R.L. Coolsaet, it's built into everything we do. Our team follows rigorous safety procedures, with ongoing training, hazard assessments, and strict compliance with OSHA, DOT, and client-specific protocols.

We are proud of our strong safety record and continue to invest in new technologies and practices that protect our people, the public, and the environment.

Environmental Stewardship

We understand that pipeline construction often intersects with sensitive land, water, and wildlife areas. That’s why we work closely with environmental engineers, inspectors, and agencies to minimize impact and restore land to its original condition.

Our crews are trained in:

  • Wetland and stream crossing best practices

  • Erosion and sediment control

  • Spill prevention and containment

  • Land and habitat restoration

  • Compliance with federal, state, and local environmental laws

Our approach is built on respect—for the land, the communities we work in, and the future.

Why Choose R.L. Coolsaet for
Transmission Pipelines?

When you choose us, you’re choosing a partner with:

Proven Experience

We’ve installed thousands of miles of pipeline for some of the country’s leading energy providers. Our resume includes projects of all sizes, scopes, and complexity for almost ninety years

Self-Performing Crews

From earthwork and welding to testing and tie-ins — we do the work ourselves. This gives you tighter control over quality, cost, and schedule.

Turnkey Project Delivery

We manage every stage of the pipeline process — including permitting support, materials procurement, construction, testing, and restoration.

 

Commitment to Quality

Every weld, every trench, every joint is inspected and held to the highest standards. We don’t cut corners, because reliability matters.

Responsive & Reliable

We’re known for our ability to mobilize quickly, adapt to challenges, and keep projects moving forward. Our team works hard to earn your trust — and keep it.

 

Industries We Serve

We work with clients across multiple sectors, including:

Natural Gas Utilities

  • Crude Oil & Refined Products Transporters

  • Midstream Operators

  • Energy Developers

  • Engineering & EPC Firms

  • Municipal & Government Agencies

From major transmission corridors to regional delivery lines, we support projects that fuel homes, businesses, and industries across the country.

Let’s Build Your Next Pipeline

Whether you’re planning a major transmission route or upgrading your existing infrastructure, R.L. Coolsaet Construction has the experience, equipment, and dedication to get the job done right.

Contact us today to discuss your transmission pipeline needs. Our team is ready to help you plan, build, and maintain safe, efficient pipeline systems that stand the test of time.