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Study of Composite Insulator Sheds Subjected to Wheel Test

Mackiewicz M., Mikulski J. L., Wańkowicz J., Kucharski S., Ranachowski P., Ranachowski Z.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2A

679--686

The paper presents investigation of the properties of the surface and the material stiffness – flexibility of series of samples taken from the sheds of the composite insulators. The insulators were previously subjected to wheel test. The wheel test and 1000 h salt fog test are regarded as alternative examination of the material resistance to the effects of electrical surface discharges. There were investigated two series of the samples of the composite insulators sheds. Examined specimens, made of HTV silicone rubber, were taken from the sheds of medium-voltage composite insulators of two different manufacturers. Insulators of both types passed the 1000 h salt fog test without reservation. Meanwhile, the wheel test can provide a basis for better distinguishing between physical properties of the tested materials. In the case of the insulators of one of the manufacturers the wheel test result was negative. Cross puncture effect of the sheds took place in several places. In addition, sheds were covered with dark coating of varying thicknesses. The results of the study indicated a significantly stronger influence of electrical and temperature factors on the sheds under investigations during the wheel test than in the case of the 1000 h salt fog test. It can be stated that these tests cannot be considered as alternative and it seems that wheel test enables better distinguishing between properties of the materials.

Procesy korozyjne w rafineriach i zapobieganie ich skutkom poprzez stosowanie inhibitorów korozji

Gaździk B.

Nafta-Gaz

2016

R. 72, nr 3

198--206

Korozja instalacji podczas procesu przeróbki ropy naftowej w rafineriach jest ogromnym problemem technicznym. Skutki procesów korozyjnych wiążą się zwykle z dodatkowymi, często znacznymi kosztami, dlatego też wykorzystywane są różne metody ochrony przed korozją. Jedną z rozpowszechnionych metod jest stosowanie inhibitorów korozji. W publikacji przedstawiono opis wykorzystywanych w INiG – PIB metod badań laboratoryjnych właściwości funkcjonalnych inhibitorów korozji dla przemysłu rafineryjnego oraz opis przemysłowych metod zapobiegania korozji w rafineriach.

Corrosion in the plant during the processing of crude oil in refineries is a huge technical problem. Effects of the corrosion processes result in a considerable amount of additional costs, and therefore different methods of corrosion protection are used. One of the widespread methods of corrosion protection, is the use of corrosion inhibitors. This publication describes methods of laboratory testing of functional properties of corrosion inhibitors for the refinery industry and description of methods of preventing corrosion in refineries.