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| ISO9001 Certification |
| 28 Jul 2000 | Corporate Information Technology Center |
| 05 Aug 1998 | Rayong Gas Separation Plant achieved ISO 9001 certification from Management System Certification Institute (Thailand) |
| 30 Mar 1998 | Khanom Gas Separation Plant achieved ISO 9001 certification from Management System Certification Institute (Thailand) |
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| ISO 9002 Certification |
| 20 Dec 2000 | Sri Racha Oil Terminal achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 08 Dec 2000 | Lampang Petroleum Terminal (LPG Operations Section) achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Surat Thani Petroleum Terminal(LPG Operations Section) achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 24 Nov 2000 | Region 1 Pipeline Operations Division achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Region 3 Pipeline Operations Division achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Region 5 Pipeline Operations Division achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Region 2 Pipeline Operations Division achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Finance and Accounting Department, Gas Business Group achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Region 4 Pipeline Operation Division achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 27 Oct 2000 | U-Tapao Aviation Station achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Lubricants Operations Division achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 28 Sep 2000 | Travel & Vehicles Services Section (Travel Services only) achieved ISO 9002 certification from BM Trada |
| | Training Division (Wangnoi) achieved ISO 9002 certification from BM Trada |
| | Medical Division achieved ISO 9002 certification from BM Trada |
| 22 Sep 2000 | Chieng Mai Aviation Station achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Bang Chak Petroleum Terminal (Oil Operations Section) achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Lumlukka Oil Terminal achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Chieng Mai Oil Terminal achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Pukhet Oil Terminal achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 22 Oct 1999 | Prakhanong Oil Terminal achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Ubon Ratchathani Oil Terminal achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 27 Aug 1999 | Bang Chak Petroleum (LPG Operations Section) achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Nakhon Sawan Petroleum Terminal (LPG Operations Section) achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Songkhla Petroleum Terminal (LPG Operations Section) achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| | Khon Kaen Petroleum Terminal (LPG Operations Section) achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 25 Dec 1998 | Had Yai Aviation Depot achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 28 Nov 1998 | Ban Rong Po LPG Terminal achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 07 Aug 1998 | Khao Bo Ya LPG Terminal achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
| 19 May 1998 | Phuket Aviation Depot achieved ISO 9002 certification from Management System Certification Institute (Thailand) |
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| ISO / IEC 17025 |
| 12 Apr 2000 | Quality Control Division, Terminal Operations Department achieved ISO 17025 certification from Management System Certification Institute (Thailand) |
| 14 Feb 2000 | Calibration labolatory,Pipeline Maintenance & Engineering Division achieved ISO 17025 certification from Management System Certification Institute (Thailand) |
| 30 Nov 1998 | Testing Laboratory, Gas Quality and Quantity Control Division, PTT Gas achieved ISO 17025 certification from Management System Certification Institute (Thailand) |
| 28 Nov 1998 | Testing labolatory,The Rayong Gas Separation Plant Laboratory achieved ISO 17025 certification from Management System Certification Institute (Thailand) |
| 18 Nov 1998 | Testing labolatory,Quality Control Division, PTT Oil achieved ISO 17025 certification from Management System Certification Institute (Thailand) |
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| Productivity Activities |
| 23 Mar 1998 | Productivity staff from Quality, Safety and Environment Department received 1998 QC Facilitator Award from the Technology Promotion Association (Thailand – Japan) |
| 20 Mar 1998 | Senior Vice President, Plant Operations, Rayong Gas Separation Plant received 1995 QC Promoter Award from Technology Promotion Association (Thailand – Japan) |
| 06 Mar 1998 | Rayong Gas Separation Plant was awarded the 1997 Outstanding Industry, Productivity Category, from the Ministry of Industry |
| 28 Aug 1997 | A QC Group from Songkhla petroleum terminal was nominated as Thailand representative to present their activity in International Convention on QC Circles’ 97 |
| 20 Mar 1997 | Productivity staff from Quality, Safety and Environment Department received 1998 QC Facilitator Award from the Technology Promotion Association (Thailand – Japan) |