Browsing by Subject "complete stoppage of medium flow"

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Access status: Open Access ,
Badanie bezpieczeństwa rurociągu ze względu na uderzenie hydrauliczne
(Wydawnictwa AGH, 2023) Fąfara, Zbigniew
The paper presents the results of a study of the effect of hydraulic hammer on the sudden increase in internal pressure in the “Druzhba” trunk pipeline transporting crude oil. The subject of the investigation is a path of one section of the pipelines with a length of 103.5 km. During the analysis, nine selected events were taken into account, during which one of the pump stations was completely stopped. Practice shows that the effects of hydraulic hammer occurring in pipeline systems transporting liquid media are the cause of their failure in more than 80% of cases. The results of direct measurements of pressure changes inside the pipeline accompanying a complete stoppage of the flow of crude oil indicate an up to three-fold increase in the pressure of the transported medium at the entrance of the stopped pump station, which is particularly dangerous and may result in leakage of the “Druzhba” pipeline. Despite the recent changes in the market for crude oil supplies to Europe and the reduction of its import from Russia due to the aggression against Ukraine, the trunk pipeline “Druzhba” is currently still the primary installation supplying oil to Ukraine, Slovakia, the Czech Republic and Hungary, while in Poland its part is used to transport oil to refineries located in the eastern part of Germany. The main pipeline “Druzhba” was built 60–70 years ago and currently its technical condition may leave much to be desired, so its safety is a very important issue.
Access status: Open Access ,
Prędkość rozchodzenia się w rurociągu fali ciśnienia powstałej po uderzeniu hydraulicznym
(Wydawnictwa AGH, 2024) Fąfara, Zbigniew; Matuła, Rafał
The paper presents the results of a study of the propagation speed of the internal pressure increase wave created by the hydraulic hammer caused by a stoppage of the flow of crude oil in a section of the trunk transmission pipeline “Druzhba”. The results of pressure measurements in a section of one line of the 103.5-kilometer-long pipelines, at five measurement points, were analyzed. The preassure was recorded continuously every second. The analysis included nine events occurring in one year, when one of the pump stations was stopped. Practice shows that hydraulic hammers occurring in such a situation in pipeline systems transporting liquid media are the most common cause of their failure. The results of direct measurements of pressure changes inside the analyzed section of the pipeline accompanying the stoppage of the flow of crude oil indicate an up to three-fold increase in the pressure of the transported medium at the entrance of the stopped pump station, which is particularly dangerous and may result in leakage of the “Druzhba” pipeline. It was built 60–70 years ago, so it’s safe operation is now a very important issue.