Vibration protection of oil pipeline pumping equipment using systems with quasi-zero stiffness

The article is devoted to the problem of vibration protection of main oil pipeline pumping equipment using vibration isolators with quasi-zero stiffness (QZS). The operation of centrifugal pumps at oil pumping stations generates significant dynamic loads transmitted to foundations and adjacent structures, leading to accelerated wear, reduced reliability, and increased construction costs due to the necessity of massive foundations. The theoretical foundations of QZS systems are presented, including the principle of combining positive and negative stiffness elements to achieve a near-zero effective stiffness region while maintaining high static load-bearing capacity. A mathematical model of a proposed QZS vibration isolator based on disk springs (Belleville washers) is developed, and the conditions for achieving the quasi-zero stiffness regime are derived. The force transmissibility analysis demonstrates that QZS isolators with natural frequencies below 1 Hz can reduce transmitted dynamic forces by orders of magnitude compared to conventional rubber or spring mounts. A practical calculation of foundation concrete volume reduction is performed for a NM 10000-210 pump unit, showing that the application of QZS isolators can decrease the required foundation volume by more than 60 %. The results confirm the high efficiency and economic feasibility of QZS vibration isolators for oil pipeline pumping stations, compressor stations, and other industrial equipment in the oil and gas industry.