Search academic texts

Information × Registration Number 0222U003194, 0118U100537 , R & D reports Title Improved operational reliability of trunk pipelines and oil storage tanks by providing technological guarantees for the quality of welded joints and optimizing the conditions for their safe operation. popup.stage_title Head Nyrkova Liudmyla I., Кандидат технічних наук Registration Date 21-02-2022 Organization E.O.Paton Elektric Welding Institute National Academy of scinces of Ukraine popup.description2 A new method of multilayer combined welding of longitudinal seams of pipes for thick-walled pipes is proposed. The required level of impact strength of the intermediate layers metal of joint is provided only by their additional alloying with the optimal amount of titanium and boron. The study results of the effectiveness using a lot of technological techniques for multilayer welding of seams under flux are presented. Three regions of potentials, in which SCC of pipe steels in soil electrolyte occurs by different mechanisms has been established. The region of the mixed fracture mechanism, in which local anodic dissolution and hydrogen embrittlement occur simultaneously is: 10G2FB steel – from -0.75 V (s.c.e.) to -1.05 V; for 09G2S – from -0.85 V to -1.0 V; for 17G1S –from -0.8 V to -0.98 V. At more positive potentials the mechanism of local anodic dissolution proceeds, at more negative potentials – hydrogen cracking prevails. Electrolytic penetration of hydrogen into the above steels begin at -0.95 V. Methodology for determining the susceptibility of pipe steels to hydrogenation with cathodic polarization has been developed. The susceptibility to corrosion cracking of 17G1C steel and its high-frequency joint increases as the potential approaches to -1.05 V and above, for arc joint remains almost the same. The validity of the application of susceptibility to SCC coefficient KS, introduced for the base metal, to assess of welded joints is established. Reducing the polarization potential to -0.75 V promotes to preserve the protective properties of modern polymer coatings for main pipelines (combined, polyurethane and epoxy coating). Proposals for the selection and optimal application of different designs of the studied coatings have been developed. Proposals for the conditions of enter into a list of sheet S355J2 + N and S420NL steels in the table of the list of steels recommended by the standards of Ukraine for group A of oil storage tank designs have been developed. Product Description popup.authors Barvinko Yuriy P Goncharenko Larissa V Klimenko Anatoliy V Kovalenko Svetlana Yu Kuzʹmenko Vitaliy P. Nyrkova Liudmyla I. Osadchuk Svitlana Oleksiivna Poperechna Eugenia V Rybаkov Anаtolii O Feinberg Leonid Yo Yashnyk Artem M popup.nrat_date 2022-03-09 Close