Geodesic
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
Problemy fiziki, matematiki i tehniki, no. 4 (2024), pp. 25-29.

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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).
Keywords: coated pipe, orthotropy, fibers, wave velocity, hydraulic shock, method of characteristics, pressure, fluid flow.
Mots-clés : matrix 
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V. V. Mozharovsky; S. V. Kirhintsava. 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. Problemy fiziki, matematiki i tehniki, no. 4 (2024), pp. 25-29. http://geodesic.mathdoc.fr/item/PFMT_2024_4_a3/

[1] N.E. Zhukovskii, O gidravlicheskom udare v vodoprovodnykh trubakh, Gostekhteoretlitizdat, M., 1949, 104 pp.

[2] Rahul Kr. Garg, Dr. Arun Kumar, “Analysis of Hydraulic Transients in a Reservoir-Valve-Pipeline Arrangement by Using Method of Characteristics (MOC)”, Conference Paper, International Conference Advancement in Technologies its applications in Current Era (ICATACE-2018) (April 2018, India), 9 pp.

[3] V.V. Mozharovskii, S.V. Kirgintseva, “Skorost volny pri gidroudare i napryazhenno-deformirovannoe sostoyanie sloistykh futerovannykh trub iz ortotropnykh materialov”, Problemy fiziki, matematiki i tekhniki, 2022, no. 2 (51), 44-51

[4] V.V. Mozharovskii, S.V. Kirgintseva, “Vliyanie skhem armirovaniya truby iz kompozita na skorost volny pri gidravlicheskom udare”, Problemy fiziki, matematiki i tekhniki, 2023, no. 3 (56), 21-25

[5] V.V. Mozharovskii, S.V. Kirgintseva, “Vliyanie raspolozheniya volokon v trube iz kompozita na parametry gidravlicheskogo udara”, Problemy fiziki, matematiki i tekhniki, 2023, no. 4 (57), 30-35

[6] F. Evangelista et al., “Wave celerity in hydraulic transients computation for cipp-rehabilitated pipes”, Int. J. Comp. Meth. and Exp. Meas., 8:4 (2020), 326-340

[7] Water hammer Calculation Excel Sheet, (Data dostupa: 15.05.2023) https://www.coursehero.com/file/46340495/Water-Hammer-Calculationxsl/