Our company provides flange constant torque fastening technical service for the core devices in a petrochemical 20 million tons/year refining and chemical integration project, and the bolts within the scope are fastened in place at one time, without hot tightening. The core key devices such as reactors are fastened and passed at one time by using tensioners, which saves time and effort and greatly reduces the commissioning cost. In the process of technical service, our company provides professional operation training, skill training and safety training to Party A's equipment management personnel and construction personnel of the construction party, and establishes an assessment system, strictly controls the on-the-job personnel, and lays a solid foundation for the safe and stable production of the device.