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  • Inspection Subjects
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  • Contact Us
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QUALITY INSPECTION & CONSTRUCTION MANAGEMENT













QUALITY INSPECTION & CONSTRUCTION MANAGEMENT

About TQS Inspections

Our Mission

Our Services

Our Services

 As a family-owned business with over 35 yrs experience, our mission is to protect people, planet, and assets by delivering expert inspection and construction management services that ensure safety, integrity and environmental responsibility. 

Our Services

Our Services

Our Services

We offer a wide range of inspection services including multi-disciplined equipment inspections from high-level proprietary alloys to fiberglass and thermo-plastics of all shapes and forms. TQS also offers quality and construction management for site projects, field erection, and plant buildouts. TQS also partners with clients to perform t

We offer a wide range of inspection services including multi-disciplined equipment inspections from high-level proprietary alloys to fiberglass and thermo-plastics of all shapes and forms. TQS also offers quality and construction management for site projects, field erection, and plant buildouts. TQS also partners with clients to perform third-party vendor audits and in-house development of inspection and  testing procedures.

Our History

Our Services

Our History

TQS Inspections, Inc. was founded in 1990 by Doug Mitchell. With a background in welding and quality assurance program development, Doug saw the need for onsite and shop fabrication inspections for a variety of both Domestic and International customers. In 2022, TQS expanded into construction and safety management services where we provid

TQS Inspections, Inc. was founded in 1990 by Doug Mitchell. With a background in welding and quality assurance program development, Doug saw the need for onsite and shop fabrication inspections for a variety of both Domestic and International customers. In 2022, TQS expanded into construction and safety management services where we provide management of contractors and subcontractors on projects up to $300M in value to ensure safety, integrity, and environmental responsibility for mined materials.

Key Inspection Subjects

TQS has extensive experience with a broad range of materials of construction, including, but not limited to the following:

Alloys

API 510 Vessels

API 570 Piping

API 620 Vessels

API 650 Tanks

ASME B31.1 Power Piping

ASME B31.3 Process Piping

ASME Pressure Vessels

ASME Section 4 Boilers

Augers & Screw Conveyors

Bag Houses

Chrome-Moly & Carbon Steel

Cogen Power Plants

Cryogenic Heat Exchangers

Digestors

Dryer Drums

FIN Tube Economizers

FIN Tube Superheaters

Gas/Gas Exchangers

Glass Lined Vessels & Agitators

Jacketed Pressure Vessels

Lined Pipe

LIW (Loss in Weight) Feeder

Mechanical Conveying Equipment

MONU Isotainers Tanks

OCAP Exchangers

Pharmaceutical Piping Tanks & Vessels

Plate/Frame Heat Exchangers

Power Boilers

Precipitators

Reactive Metals

Recovery Boilers

Rotary Kilns

Sanitary/Food Grade Piping Tanks and Vessels

Shell & Tube Heat Exchangers

Steam Turbines

Stokers

Subsea Umbilical’s

Tray Towers

Valves

Wet Electrostatic Precipitators

Representative Projects

Molycorp Minerals Project Phoenix

  • Performed all vendor surveillance.
  • Performed testing of soils and geo-testing, concrete, FRP EQ, piping, pressure vessels, and structural steel. 
  • Worked with the San Bernadino County, CA building authority to manage permitting and compliance.

Abengoa BioEnergy BioFuels

  • Managed the quality program under direction of Abengoa Quality manager during ground-up buildout of a prototype Biorefinery. 
  • Managed all inspections and inspection teams and contractors throughout the fabrication. 
  • Performed vendor surveillance, in-plant inspections of vessel installations, welder qualifications and testing, weld inspections of all piping, arranging all 3rd party NDT, Film Interpretation, Boroscope of ~6500 welds throughout the plant, and PMI (Positive Material Identification).

Monsanto Muscatine

  • Performed piping installation inspections and nutrient inspections
  • Field erected API tanks
  • Performed scheduled maintenance of MONU Isotainer tanks

Bayer Caldwell Canyon

  • Provided construction managers for mine and rail loop, as well as quality manager for plant installation inspections. 

Bayer Eloy Seed Expansion

  • Performed inspection of shop fabrication and testing of seed drums
  • Provided construction management for electrical services

Bayer Big Dicamba

  • Performed vendor surveillance of high-level project equipment with in-plant coverage of equipment deliveries and shipping damage inspections.

Our Work in Pictures

Contact Us

Need a quote for your upcoming project or want to learn more about what we do? Drop us a line!

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Doug Mitchell, Founder & President

Megan Mitchell-Dunkmann, VP Operations

TQS Inspections

3910 Old Highway 94 South suite 122, Saint Charles, MO, USA

(636) 734-1412

TQS Inspections

(636) 734-1412

Copyright © 2025 TQS Inspections - All Rights Reserved.

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