Siamraj Public Company Limited, together with its subsidiaries, constructs natural gas metering and pipeline transmission systems in Thailand. The company operates in five segments: Industrial Pumps, Natural Gas and Transmission Systems, Alternative Energy, Field of Flow Measurement Business, and Other Business. It offers flow measuring systems and engineering services from branched natural gas pipeline to the power stations, process industrial plants, and natural gas service stations. The company also engages in the design, construction, trading, installation, inspection, repairing, and maintenance of natural gas metering systems, such as gas chromatographs, flow metering elements, and flow computers and systems; and inspection, repair, and maintenance service of equipment in gas metering stations. In addition, it owns, operates NGV stations in Bangna; designs and constructs natural gas quality improvement station for cars; develops solar energy and other alternative energy projects; and provides manpower, accounting, financial, and maintenance services. Further, the company offers car park services comprising management of parking building and commercial property rental and related services. Additionally, it provides industrial and municipal waste treatment air compressors; gas turbines and compressors for power plants; and industrial pump systems, such as gear, sanitary, screw, diaphragm, and process centrifugal pumps, as well as vacuum and process metering systems. The company was formerly known as Siamrajathanee Corporation Company Limited and changed its name to Siamraj Public Company Limited in February 2015. Siamraj Public Company Limited was incorporated in 1984 and is headquartered in Samut Prakan, Thailand.