Hiap Seng Engineering Ltd. is a Singapore-based company, which is an integrated service provider of mechanical engineering, plant fabrication & installation. The Company provides plant maintenance to the oil-and-gas (serving both upstream exploration and production as well as downstream refinery and storage), petrochemical and pharmaceutical industries in Singapore, Asia Pacific and other regions. The engineering, procurement, and construction services include tanks and terminals, process piping, pressure vessels, process equipment installation, and modular compression. The plant maintenance services include shutdown/turnaround, daily maintenance, planned/unplanned maintenance and De-bottlenecking/troubleshooting. Its subsidiaries include Asia Process Industries Pte Ltd, Orian Tuas Shipyard Pte Ltd, HS Engineering Shanghai Co ltd, HS Engineering (M) Sdn Bhd and HS Engineering (Middle East) Pte Ltd.