The article is the result of two years of research on the effect of strong acids on the residual strength of polyamide rope. To observe the degradation of rope strength, all the work was divided into several time stages, at each of which the condition of the polyamide rope was assessed, and its residual strength was determined. Solutions of sulfuric and hydrochloric acids, which are often part of the household detergents, were selected for the study. These products are used by the glass and facade cleaners to remove heavy dirt.
The study examined samples that were exposed to strong acids 24 months ago, conducted a visual inspection and strength check. During the visual inspection of the samples, a white coating, and traces of destruction of the braid and part of the core were recorded. On a static stand, the residual strength of the samples was determined, for which the average value of the residual strength was calculated. For samples exposed to hydrochloric acid, the average value of residual strength was 3.67 kN, and for sulfuric acid — 3.09 kN. When compared with the previous stage of the study, the loss of strength turned out to be insignificant, and visual inspection made it clear that it is required to pay attention to the effect of acids at the early stages of contact, and to conduct daily inspection controls during work.
Based on the data obtained, it was revealed that the strength of the rope drops significantly already 5 days after exposure to acids, the decrease in strength for the 10th month is more than 50%, while further indicators of strength loss are insignificant. From a visual point of view, defects in the final stages of the study are not hidden, and clearly demonstrate the destruction of the rope.
1. Vasilenko V.V., Lelikov G.D., Ovchinnikova T.A., Korolchenko D.A. Determination of criteria for assessing the effect of inorganic acids on synthetic ropes in order to improve the safety of high-altitude works. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2019. Vol. 28. № 6. pp. 35–51. (In Russ). DOI: 10.18322/PVB.2019.28.06.35-51
2. Vasilenko V.V., Lelikov G.D., Zherdev K.V. Effect of Acid Solutions on the Residual Strength of Safety and Rescue Ropes. Bezopasnost Truda v Promyshlennosti = Occupational Safety in Industry. 2020. № 2. pp. 38–44. (In Russ). DOI: 10.24000/0409-2961-2020-2-38-44
3. Karaseva T.A., Prostakishin D.A., Antonova V.A., Zherdev K.V. Determination of the Residual Strength of Polyamide Rope after Exposure to Weak Acids. Bezopasnost Truda v Promyshlennosti = Occupational Safety in Industry. 2021. № 8. pp. 84–90. (In Russ). DOI: 10.24000/0409-2961-2021-8-84-90
4. Vasilenko V.V. Actualization of the method of dynamic testing of the shock absorbers as means of individual protection against falls from a height. Stroitelstvo — formirovanie
sredy zhiznedeyatelnosti: sb. tr. XX Mezhdunar. mezhvuzovskoy nauch.-prakt. konf. studentov, magistrantov, aspirantov i molodykh uchenykh (Construction — formation of a living environment: collected papers of the Twenteeth International Interuniversity
Scientific and Practical Conference of the Students, Undergraduates, Graduate Students, and Young Scientists). Moscow: NIMGSU, 2017. pp. 439–441. (In Russ).
5. Korolchenko D., Vasilenko V., Lelikov G. Problems of the dynamic test method for individual protection equipment (shock absorbers). MATEC Web of Conferences. Ho Chi Minh City: EDP Sciences, 2018. pp. 05034. DOI: 10.1051/matecconf/201819305034
6. Hsiao H., Whitestone J., Taylor S., Godby M., Guan J. Harness Sizing and Strap Length Configurations. Human Factors. 2009. Vol. 51. № 4. pp. 497–518. DOI: 10.1177/0018720809346320
7. Stupakov A.A., Lelikov G.D., Semenov P.A., Vasilenko V.V. Inspection and Repair of High-Rise Objects Work Including Industrial Alpinism. Mekhanizatsiya stroitelstva = Mechanization of Construction. 2015. № 2 (848). pp. 48–52. (In Russ).
8. Larin S. A. Problems of extreme sports insurance. Voprosy nauki i obrazovaniya = Questions of science and education. 2018. № 7 (19). pp. 176–180. (In Russ).
9. Stupakov A.A., Lelikov G.D. Calculation of Risks Caused by the Use of Personal Protective Equipment Against Falls from Height. Mekhanizatsiya stroitelstva = Mechanization of Construction. 2014. № 12 (846). pp. 50–54. (In Russ).
10. Fam N.T., Vasilenko V.V., Korolchenko D.A. Actualization of the Dynamic Test Methods to be Systemized for Temporary Edge Protection Systems. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2017. Vol. 26. № 12. pp. 35–44. (In Russ). DOI: 10.18322/PVB.2017.26.12.35-44
11. Wu D., Li Z. Work safety success theory based on dynamic safety entropy model. Safety Science. 2019. Vol. 113. pp. 438–444. DOI: 10.1016/j.ssci.2018.12.022
12. Varianou-Mikellidou C., Boustras G., Nicolaidou O., Dimopoulos Ch., Anyfantis I., Messios P. Work-related factors and individual characteristics affecting work ability of different age groups. Safety Science. 2020. Vol. 128. DOI: 10.1016/j.ssci.2020.104755
13. Prostakishin D., Nam Thanh Ph. Dynamic test method for full body harnesses exploited in cold climates. IOP Conference Series: Materials Science and Engineering. Belgorod: Institute of Physics Publishing, 2020. DOI: 10.1088/1757899X/945/1/012027