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At St. Clair Mechanical, we’re not just equipped for success – we’re built for it.

With over 100 experienced mechanical professionals, we are qualified to excel in any project.

Square feet of shop floor space for carbon steel
Square feet for stainless steel and alloys
Square feet of warehouse floor space
Acres of construction yard space
Ton crane capacity
Feet of height under hook

Industries Served

Oil and Gas Industry

  • Gathering Line Construction
  • Compressor Station Piping
  • Metering Stations
  • Pump Stations
  • Launcher Receivers
  • Modular Skids
  • Plant Maintenance
  • Commissioning

Refinery Work

  • Refinery Equipment Installation
  • Process Piping
  • Pressure Vessel Fabrication and Repair
  • Instrumentation and Control Systems


Shop Fabrication

St. Clair Mechanical provides extensive shop fabrication services within our 32,500 square foot facility. We expertly handle custom fabrication of piping and equipment modules utilizing diverse materials such as carbon steel, stainless steel, nickel, inconel, chrome-moly, aluminum, hastelloy, monel, and clad. Specializing in precision welding and assembly, we adhere to stringent ASME quality standards with over 200 registered weld procedures. Our fabrication scopes consist of, but are not limited to:

  • Compressor, pump and metering station piping
  • Launcher / receiver systems
  • Power plant piping systems
  • Process piping system


Our construction services encompass a diverse range of projects including:

  • Constructing and installing compressor and metering station equipment and piping systems
  • Installation of pumps, valves, and monitoring equipment along pump station pipelines
  • Installation of refining equipment and optimizing processing facility operations
  • Installation of processing units, piping, and storage tanks for refinery construction
  • Equipment installation and modifications to plant expansion projects

Modular Skids

St. Clair Mechanical specializes in the fabrication and assembly of modular skids for diverse applications, from pump and electrical units to multi-level processing systems. Our advanced facilities and extensive lay-down area streamline construction and ensure timely delivery, supporting the smooth installation and operation of modular projects.

Shutdown Support

St. Clair Mechanical provides expert shutdown management services, meticulously planning and executing each phase to minimize downtime and enhance facility performance during turnaround periods. Our team ensures smooth operations through strategic coordination and efficient process management.


Our maintenance services are designed to maintain the continuous operation and extend the longevity of mechanical equipment and systems. We offer scheduled maintenance to proactively address needs and minimize operational disruptions, alongside emergency repair and troubleshooting services to quickly resolve issues and maintain efficiency.


Our commissioning services are tailored to the specific needs of the oil and gas industry and refineries, focusing on system verification, functional testing, and detailed documentation. We adhere to the highest industry standards, ensuring that all mechanical systems are optimized for performance and efficiency.

Equipment & Equipment Capabilities

St. Clair Mechanical is equipped with cutting-edge machinery to handle a wide array of construction tasks with precision and efficiency.

Our extensive fleet includes:


Our mechanical division features an extensive crane fleet with (6) hydro-lifts, (4) 80-ton RT cranes, (1) 90-ton RT crane, and (1) 250-ton AT crane, ensuring versatile, safe, and efficient lifting of heavy materials.

Welding Rigs

Our fleet of (25) advanced welding rigs enables us to efficiently manage simultaneous on-site fabrication and repairs, delivering precise and durable welds on metal structures and piping systems to meet project deadlines.


Our division uses (6) demagnetizers to remove magnetic fields from metal components, enhancing safety and protecting sensitive electronics in oil and gas facilities, ensuring system integrity and operational reliability.


With (5) payloaders ranging from the 914K to the 930M models, our fleet offers versatility and efficiency in handling different materials and tasks on construction sites.


Our fleet of (4) versatile telehandlers, from compact to heavy-duty models, efficiently lifts materials, transports loads across uneven terrain, and maneuvers in tight spaces for construction and industrial projects.

Float Trucks and Trailers

Our fleet of (5) float trucks and over (20) trailers, including flatbeds and step decks with ramps, ensures efficient transport and logistics for heavy and oversized loads to job sites.

Steel Access Matting

We stock (6,000) steel access mats, widely used in construction, oil and gas, and utilities to provide stability for personnel and equipment on unstable terrain, enhancing safety and efficiency on challenging sites.

Air Compressors

We maintain a fleet of (10) air compressors, ensuring reliable compressed air for pneumatic tools, cleaning, and pressure testing to boost efficiency and productivity in construction operations.

Hydraulic High Torque Pumps / Cassettes

We have (10) hydraulic high torque pumps and cassettes, providing the essential force for securely tightening bolts and fasteners, ensuring safety and integrity in industrial applications.

RAD Torque Systems / Hydraulic Torque Wrenches & Torque Equipment

Our (20) RAD Torque Systems and hydraulic wrenches provide precise, efficient torque for accurate and consistent bolt tightening, crucial for critical infrastructure projects in oil and gas, construction, and manufacturing industries.

Tool Trailers and Hydrotesting Trailer

We maintain (5) tool trailers with a full range of construction and mechanical tools, plus (1) hydrotesting trailer for pressure testing pipelines and equipment to meet safety standards.


We have (3) generators, including (2) 25KV and (1) 75KV gensets, providing reliable power for construction sites, industrial facilities, and remote locations to ensure uninterrupted operations.

Light Towers

We have (6) light towers essential for illuminating construction, maintenance, and repair sites, enhancing safety and enabling efficient operations in low-light conditions.


We offers a range of manlifts, including (3) scissor lifts and (3) articulating boom lifts, providing safe and efficient access to elevated areas for construction, maintenance, and installation projects.

Our Esteemed Clients

At St. Clair Mechanical, we proudly serve leading clients in the oil and gas industry, committed to delivering exceptional results that fuel innovation and progress.

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Expert Mechanical Construction

Tailored Solutions for Superior Quality and Efficiency

Trust St. Clair Mechanical for your next project. Experience unparalleled professionalism and dedication to excellence—contact us today to see how our customized solutions can advance your operations.