QLT is a Thailand-based company primarily engaged in the provision of NDT testing and engineering inspection and certification services, including quality control services to various industries including petrochemicals, oil and gas as well as power generation. It provides inspection and testing services, especially for steel structure during construction, manufacturing, online service and plant shutdown, to ensure the usefulness and serviceability of the structure including the likes of liquefied petroleum gas (LPG) tanks and piping, industrial boilers and cranes in compliance with Thai law.