E and S Environmental Services
- Diagnostic testing of tanks, lines and vapour recovery systems, fuel polishing and conditioning, road tanker vehicle inspection and testing, and pipeline leak detection.
- http://www.eandsgroup.co.uk/

The Air Toxic Compliance Consortium
- Information on the status of air toxic regulations and compliance requirements, and natural gas compliance technologies and vendors, and links to related web sites.
- http://www.energysolutionscenter.org/airtoxic/

Kidao Laboratories
- Testing rubber, plastics, paints and grease. Mechanical testing and failure analysis of welds. Non-destructive testing. Corrosion testing.
- http://www.kidaolabs.com/

Cahill Instrumentation Ltd.
- Repair/calibrate/re-certify a wide variety of lab and field measuring instruments.
- http://www.instlab.com/

LCS
- Marine surveyors. Provide inspection of vessels, maritime equipment and cargo on the Gulf Coast. Includes testing of oil cargos.
- http://lcs-llc.com

Well Testing Wireline Service Company, Inc.
- Provides high pressure and low pressure testing. Based in Monahans, Texas.
- http://www.welltesting.net/

FracTech Ltd.
- Providing independent well completion and stimulation laboratory testing, design and consultancy services, to operators and service companies world-wide. Based in Ashford, Middlesex, UK.
- http://www.fractech.co.uk/

Q and Q Control Services UK Ltd
- Inspection and testing of petroleum, oil, hydrocarbons, petrochemicals, marine and dry bulk cargoes worldwide. Based in Suffolk.
- http://www.qqcontrol.co.uk/