Engineered Estimate of the Design Parameters of a Built-up Jet-Forming Nozzle for Mobile Underwater Waterjet Cutting Systems

The adaptation of waterjet cutting technology to underwater working conditions will allow solving various tasks when performing underwater technological operations, including maintenance of man-made hazardous objects. The implementation of such technology under water is possible with the application of mobile installations having low power, which imposes certain restrictions on its use. A method for improving the efficiency of mobile installations implementing underwater waterjet cutting is proposed. The method is based on the use of a built-up jet-forming path consisting of a diamond nozzle, an additional transition tube and a standard focusing tube. The structural externality of the diamond nozzle is given. A physical and mathematical model of the process of forming a high-speed jet which implements the technology of underwater hydro- or waterjet cutting, when the flow of a suspension under pressure passes through the jet-forming path of the proposed design, is described. Using calculations based on the developed model and results of field experiments, the effect of the structural element parameters of the built-up jet-forming path on the output characteristics of the formed jet flow is determined. The possibilities of applying such a design for controlling the output characteristics of the formed high-speed jet are assessed and the practicability of its use is indicated.

References

[1] Thiyahuddin I., Tan N.W., Dindi M., Ikhranizam M., Ros M. Abrasive Waterjet Cutting Simulation Using Coupled SPH-FEA Method. SPE Symposium: Decommissioning and Abandonment. Society of Petroleum Engineers. Conference Paper, 2018, January, doi: 10.2118/193949-MS

[2] Kononenko V.Ya. Application of method of dry welding in repair of underwater passages of gas and oil pipelines in Russia. Avtomaticheskaya svarka, 2010, no. 5, pp. 54–59 (in Russ.).

[3] Debruyne S., Massenhove K.V., Brackx K. Real-time underwater abrasive water jet cutting process control. Proceedings of EuroNoise, 2015, vol. 10, pp. 1375–1379.

[4] Kivisto B. Water jet Technology and Applications-Deepwater Subsea. Oil Spill India. Conference, Goa, India, 2011, vol. 30. Available at: http://chukarwaterjet.com/wp-content/uploads/2018/07/White-Paper-Subsea-Waterjetting_0.pdf (accessed 06 October 2020).

[5] Brynykh A., Shustek L., Elinskis A. Emptying, chemical cleaning and conservation of the DN 700 Polotsk–Ventspils oil pipeline on a 250 km long section. Truboprovodnyy transport: teoriya i praktika, 2011, no. 3, pp. 7–11 (in Russ.).

[6] Lekareva A.V., Kobzev A.A., Makhfuz A.A. Features of constructing a mobile robotic complex of waterjet cutting of oil pipelines. Ekstremal’naya robototekhnika, 2018, vol. 1, no. 1, pp. 367–376 (in Russ.).

[7] Sozinova T.V., Ryabtseva A.E., Yakovtsev P.A. Application of waterjet cutting in the production of aviation equipment to increase safety. Uspekhi sovremennogo estestvoznaniya, 2010, no. 10, pp. 48–49 (in Russ.).

[8] Matrizayev M.Yu., Khallyyev N.Kh., Gumerov A.K. Methodology of improving efficiency of construction and repair works on underwater field pipelines that were in operation. Problemy sbora, podgotovki i transporta nefti i nefteproduktov, 2016, no. 2, pp. 74–83 (in Russ.).

[9] Pizintsale L.V., Aleksandrovskaya N.I., Varbanets R.A. Choice of the technological process of the ship hull utilization using the method of expert assessments. Vestnik Astrakhanskogo gosudarstvennogo tekhnicheskogo universiteta. Ser. Morskaya tekhnika i tekhnologiya, 2015, no. 1, pp. 14–20 (in Russ.).

[10] ElaineMaslin. Subsea waterjet cutting goes ultra-deep and ultra-highpressure Offshore Engineer. Available at: https://www.oedigital.com/subsea/item/4249-subsea-waterjet-cutting-goes-ultra-deep-and-ultra-high-pressure (accessed 05 October 2020).

[11] Kivisto B. Deepwater Subsea Waterjet Impact on HSE. Offshore Technology Conference-Asia, 25–28 March, 2014, Kuala Lumpur, Malaysia, 2014, 6 p., doi: https://doi.org/10.4043/24783-MS

[12] Arkhipov A.N., Kobzev A.A., Lekareva A.V., Makhfuz A.A., Petukhov E.N. Analysis of robotization of oil pipeline hydraulic cutting process. Sovremennyye problemy nauki i obrazovaniya, 2014, no. 6 (in Russ.). Available at: http://science-education.ru/ru/article/view?id=15697 (accessed 06 October 2020).

[13] Savin I.F., Safonov P.V. Osnovy gidravliki i gidroprivod [Basics of hydraulics and hydraulic drive]. Moscow, Vysshaya shkola publ., 1978. 222 p.

[14] Kolpakov V.I., Ilyukhina A.A. Features of mathematical modeling the destruction of structures of different materials under the high-speed waterjet. Inzhenernyy zhurnal: nauka i innovatsii, 2019, is. 9, pp. 1–8 (in Russ.), doi: 10.18698/2308-6033-2019-9-1913

[15] Ilyukhina A.A., Kolpakov V.I., Galinovskii A.L., Khakhalin A.V. The Features of Hydroabrasive Cutting of Honeycomb Panels of Space Vehicles. Moscow University Physics Bulletin, 2018, vol. 73 (4), pp. 441–446 (in Russ.), doi: 10.3103/S0027134918040069