The application relates to a pipeline connecting
flange anti-leakage device, which comprises a first protection cover and a second protection cover which are butted into a protection
barrel body, and a placing groove which accommodates a connecting
flange; the two ends of the first protection cover and the second protection cover are inserted into a
pipe body through grooves, and the inside of the placing groove of the first protection cover and the second protection cover is provided with a semi-annular sealing
gasket; the extension plates on the two sides of the first protection cover and the second protection cover are locked through bolts to form integral sealing and fix the semi-annular sealing
gasket; a film bag is arranged in the placing groove, the film bag is attached to the end face and the outer wall of the
flange; an oil injection
pipe passes through the corresponding first protection cover or the second protection cover to communicate with the film bag, one end of an oil leakage
pipe is connected to the film bag and the other end is connected to an external observation box, a
check valve is arranged in the oil leakage pipe; oil is injected before use to make the film bag tightly attached to the flange; when the connecting flange leaks, the pressure in the placing groove rises, the leakage of the placing groove extrudes the film bag, hydraulic oil in the hydraulic oil pushes away the
check valve to enter the observation box, and a patrol personnel can judge the leakage through a window.