Reducing accidental losses of aviation kerosene in simplified aircraft central fueling systems

The issues of reducing losses of aviation kerosene during its pumping in systems of centralized refueling of aircraft with fuel, in which pipes and equipment of collapsible pipelines are used, are considered. Comparative data on possible leaks through the sealing units of pipe joints with MPT couplings and welded joints are shown. A technique for determining the parameters and the number of U-shaped compensators for unloading from thermal stresses of straight horizontal sections of collapsible pipelines kits connected by welding is presented. Modeling was carried out to establish the influence of various initial data on temperature deformations and the compensating ability of U-shaped expansion joints. Dependences have been obtained to determine the compensating capacity of U-shaped expansion joints without preliminary stretching (compression) by half of the longitudinal deformation, depending on the length of the overhang and the width of the flange for pipelines PST-100 and PST-150M. Keywords: collapsible pipelines; centralized refueling of aircraft; temperature deformation of pipelines; U-shaped compensator; allowable deformation of the compensator.