Method of the Isolating Surfaces Protection against Electrostatic Hazard


V.N. Verjovkin, Dr. Sci. (Eng.), Chief Research Associate FGBU VNIIPO EMERCOM of Russia, Balashikha, Russia A.G. Markov, Cand. Sci. (Eng.), Senior Lector, markov01@yandex.ru Academy of GPS EMERCOM of Russia, Moscow, Russia

Annotation:

The method of protection of dielectric materials surfaces against electrostatic hazard is proposed. It allows for expanding the fields of application of the isolating materials and the products from them, ensuring implementation of their predominant qualities when using instead of metals, and eliminating dangerous shows of static electricity where they could be implemented unintentionally at application of earlier known methods. This decision is topical at reasonable replacement of the metal product (a wall of the vessel or tank) electrified by liquid (process medium), by the product from the isolating material with similar geometrical, technical and operational parameters keeping efficiency of protection by earthing means of the metal product. The up-to-date system of technical regulation provides for using criteria values of potential of the free isolating surfaces protected by cellular conducting structure or dissipative structures. However so far there was no model for their calculation considering dynamics of charging processes and the specified electrostatic loadings. The values are used which are related to current limit density as one of the electrostrength characteristics of mutually electrified objects, or as medium, in which electrization takes place. This method makes vitally important the area of technical regulation improvement, accumulation of data given about the values of density of electrization current of the vessels and equipment. Use of the specific electrical resistivity of the isolating material with the process medium is one of the important elements of the proposed methods. Effect of the methods of placement of the protective conducting contour coverings on electrostatic intrinsic safety of polymeric tanks and pipelines is considered. It is shown that protective efficiency of application of the grounded or dissipating electroconductive contours forming cellular structure depends also, on which side of the product wall they are placed.

References:
1. Verjovkin V.N., Smelkov G.I., Rjabikov A.I., Markov A.G. Pat. 2607652 Ros. Federacija, MPK H05F3/02. Sposob zashhity izdelij s izolirujushhimi poverhnostjami ot jelektrostaticheskoj opasnosti (Patent 2607652 of the Russian Federation, MPK H05F3/02. The Method of Protection of Products with the Isolating Surfaces from Electrostatic Hazard). Applied: September 15, 2015. Published: January 10, 2017. Bulletin № 1.
2. Markov A.G., Verevkin V.N. Electrical Strength of Dielectrics and Limit Parameters of Electrization Processes. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2013. № 7. pp. 46–51.
3. GOST 31613—2012. Jelektrostaticheskaja iskrobezopasnost. Obshhie tehnicheskie trebovanija i metody ispytanija. (GOST 31613—2012. Electrostatic Intrinsic Safety. General Technical Requirements and Test Methods). Available at: http://docs.cntd.ru/document/1200098226 (accessed: May 10, 2017).
4. Evmenov A.K., Petrochenkov A.K., Harlamov O.V., Asatov H., Gariev R.M., Nabokov V.M. A. s. 940322 SSSR, SU 1309335 A1. Ustrojstvo dlja otvoda zarjadov staticheskogo jelektrichestva s dijelektricheskih materialov (A.S. 940322 USSR, SU 1309335 A1. Device for Shunting of Static Electricity Charges from Dielectric Materials). Applied: January 22, 1986. Published: May 7, 1987. Bulletin № 17.
5. Verjovkin V.N. Obespechenie vzryvopozharobezopasnosti obektov pererabatyvajushhih predprijatij APK putem ogranichenija riska vosplamenenija gorjuchih veshhestv i materialov: avtoref. dis. … d-ra tehn. nauk (Ensuring Explosion and Fire Safety of the Objects of Agrarian Business Processing Enterprises by Risk Limitation of Combustible Substances and Materials Inflammation: Dissertation Abstract … of the Doctor of Engineering Science). Saint-Petersburg, 1998. 30 p.
6. Maksimov B.K., Obuh A.A., Tihonov A.V. Jelektrostaticheskaja bezopasnost pri zapolnenii rezervuarov nefteproduktami (Electrostatic Safety when Filling Tanks with Oil Products). Moscow: Jenergoatomizdat, 1989. 152 p.
7. Markov A.G. Jelektrostaticheskaja iskrobezopasnost podzemnyh dvustennyh polimernyh rezervuarov dlja hranenija svetlyh nefteproduktov: dis. … kand. tehn. nauk (Electrostatic Intrinsic Safety of the Underground Double Containment Polymeric Tanks for Light Oil Products Storage: Dissertation … Candidate of Technical Sciences). Moscow, 2016. 199 p.
8. Korickij Ju.V., Pasynkov V.V., Tareev B.M. Spravochnik po jelektrotehnicheskim materialam (Handbook on Electrotechnical Materials). Moscow: Jenergoatomizdat, 1986. Vol. 1. 368 p.
9. Markov A.G., Verjovkin V.N. Protection Against Electrostatic Hazard of Structural Materials by Grounded Conductive Grids. Pozhary i chrezvychajnye situacii: predotvrashhenie, likvidacija = Fires and Emergency Situations: Prevention, Liquidation. 2012. № 1. pp. 33–41.
10. GOST 31610.32-1—2015/IEC/TS 60079-32-1:2013. Vzryvoopasnye sredy. Chast 32-1. Jelektrostatika. Opasnye projavlenija. Rukovodstvo (GOST 31610.32-1—2015/IEC/TS 60079-32-1:2013. Explosion Hazardous Areas. Part 32-1. Electrostatics. Hazardous Shows. Guide). Available at: http://docs.cntd.ru/document/1200135553 (accessed: May 10, 2017).
11. GOST R 53734.5.1—2009. Jelektrostatika. Chast 5-1. Zashhita jelektronnyh ustrojstv ot jelektrostaticheskih javlenij. Obshhie trebovanija (GOST R 53734.5.1—2009. Electrostatics. Part 5-1: Protection of Electronic Devices against Electrostatic Phenomena. General Requirements). Moscow: Standartinform, 2011. 19 p.
12. Verjovkin V.N., Smelkov G.I., Cherkasov V.N. Jelektrostaticheskaja iskrobezopasnost i molniezashhita (Electrostatic Intrinsic Safety and Lightning Protection). Moscow: MIJeJe, 2006. 170 p.
13. Markov A.G. Parameters of Static Electricity Discharges in the Dielectric Tanks. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2013. № 10. pp. 61–67.
14. Verjovkin V.N., Markov A.G. Protection against Static Electricity of Polymeric Double-Containment Horizontal Tanks Having Capacity to 50 m3 for Underground Storage of Light Oil Products. Bezopasnost truda v promyshlennosti = Occupational Safety in Industry. 2016. № 3. pp. 40–43.

 

DOI: 10.24000/0409-2961-2017-7-52-58
Year: 2017
Issue num: July
Keywords : static electricity isolating surfaces grounding device electrical potential explosive mixture
Authors: