TECHNICAL WELDING INSPECTION
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TWI employs personnel who are certified in the following American Petroleum Institute Catagories:


API 510 -
Covers maintenance inspections, repair, alteration, and re-rating procedures for pressure vessels used by petroleum and chemical process industries.


API 570 - Performs visual, baseline and in-service corrosion inspections on piping systems.


API 653 - Specific inspection requirements and techniques that apply to above ground storage tanks.