Recently, Chevron oil company headquarters in the United States sent the audit team, for the technology center should stress corrosion test chamber for a period of two days of certification. Audit group of stress corrosion test chambers field test capacity and quality system operation to give a high evaluation, not only agreed to through the authentication and on-site position to the upcoming purchase of three steel grade five service environment of sulfur resistant products by the company undertake. This is the laboratory through the Thailand national oil company certification, and once again the international oil companies recognized.