- American Gas Association
- American Petroleum Institute
- British Standards Institution
- International Organization for Standardization
- ABB
- ABB USA
- AES
- Advanced Engineering Solutions Ltd.
- Air Liquide
- Air Products
- Atos Origin
- Bechtel
- Cal-Scan Services Ltd.
- Chevron Phillips Chemical Company, LP
- Deutz
- Emerson Process Management
- Flonidan Gas Division
- Holland-Controls
- INA - Industrija nafte d.d.
- Elster-Instromet
- Invensys
- Open Systems International, Inc.
- Performance Engineering LLC
- Perstorp
- Petroleum Development Consultants
- PLT Networks Gmbh
- RT-RK Computer Based Systems
- Schlumberger
- SGS
- Shell
- Siemens
- Spirax Sarco
- Tatsuno
- Tuas Power
- Wartsila
- WOW Company