| Name | Country |
|---|
| Bureau Veritas | Belgium, France, Germany, Italy, Netherlands, UK, Japan, South Korea, Malaysia, China, South Africa |
| Ceten Apave International | France |
| Det Norske Veritas | Denmark, Japan, South Korea, Malaysia, Australia, US (Houston), Norway
|
| Ebasco Services Incorporated | Italy, Netherlands |
| Kennedy & Dorkin Quality Engineering | UK |
| KR Hellas | Greece, Korea |
| Lloyd’s Register Industrial Division | Belgium, Denmark, Finland, France, Germany, Greece, Italy, Netherlands, Norway, Spain, Sweden, Switzerland, UK, Hong Kong, India, Japan, South Korea, Malaysia, Australia, Canada, US |
National Vulcan Engineering Insurance Group Ltd
| UK |
| Plant Safety Ltd | UK |
| TUV | Germany |
TUV Hellas
| Greece |
| Vincotte International | Belgium |
| Inteco Japan Ltd | Japan, South Korea |
| JMI Institute | Japan |
| Japan Boiler Association | Japan |
| Overseas Merchandise Inspection Co Ltd | Japan |
| SGS Far East Ltd | Japan |
| The High Pressure Gas Safety Institute of Japan | Japan |
| Ebasco Services Incorporated | US |
| I.D. Technical Services | Jordan |
| American Bureau of Shipping (ABS) | China |
| Rina Services S.p.A | Italy |
| China Classification Society (CCS) | China |
| Korea Gas Safety Corporation (KGS) | Korea |