The effect of the composite lining of double-layer pipes used in the technology of polymer “stocking” sanitation on the parameters of a water hammer

The influence of the characteristics of the inner coating of double-layer pipes on the parameters of hydraulic shock (head (pressure) and flow rate (velocity) of a moving liquid) by the well-known method of characteristics is investigated [1], [2]. A technique has been proposed and a program has been created in the Delphi environment that allows determining the parameters of a water hammer when liquids move in two-layer pipes coated with a composite with a different arrangement of fibers in the matrix of a composite material, provided that the axes of anisotropy coincide with the direction of the fibers. The velocity of the liquid wave in the orthotropic tube was determined according to the developed method [3]–[5], it is shown that the results obtained are in good agreement with other experimental and theoretical data. The proposed technique can be used for a new technology for restoring the operability of pipelines by inserting a special “stocking” made of synthetic felt (composite).