DEE Development Engineers Limited is an engineering company that provides specialized process piping solutions for oil and gas, power (including nuclear), chemicals, and other process industries through engineering, procurement, and manufacturing.

The company also manufactures and supplies piping products, including high-pressure piping systems, piping spools, high frequency induction pipe bends, longitudinally submerged arc welding pipes, industrial pipe fittings, pressure vessels, industrial stacks, modular skids, and accessories. These accessories include boiler superheater coils, de-superheaters, and other customized manufactured components.

The company has seven manufacturing facilities in Palwal, Haryana; Anjar, Gujarat; Barmer, Rajasthan; Numaligarh, Assam; and Bangkok, Thailand, with three manufacturing facilities located in Palwal, Haryana.

The company's manufacturing facilities had a cumulative installed capacity of 70,875 MT for the nine months ended December 31, 2023, with annual capacities of 94,500 MT, 91,500 MT, and 86,500 MT for Fiscal 2023, Fiscal 2022, and Fiscal 2021, respectively.

The company recently expanded into a new business vertical, offering design, engineering, fabrication, and manufacturing of pilot plants at Palwal Facility III.

As of March 31, 2024, the company has 1,061 employees, including 54 highly skilled welders with certifications like CSWIP 3.0 and 3.1, AWS-CWI, and CWV, and 53 employees are highly skilled in non-destructive examination with certifications like NDE level II qualifications as per ASNT/SNT-TC-1A, and NDE level III qualifications as per BS EN ISO 9712.