As part of the research carried out in the field of processing systems and the production process of oil-hydraulic cylinders of large dimensions and power, the specifics of fluid power transmission, in the functioning of hydropower facilities, were analyzed. The research also includes the optimization of the physical–mathematical model of non-stationary processes, which take place inside the chamber of a large hydrocylinder. In parallel with the definition of the optimization model, the work parameters that affect the process of fluid flow and piston movement were determined. The operating and technological construction parameters of the hydraulic cylinder, which most significantly affect the operation of the hydraulic cylinder, were defined, and the observed parameters were optimized, based on which a prototype with improved characteristics compared to existing solutions was realized.

The production of liquefied natural gas can be divided into four stages: production, preparation and transportation of natural gas by pipeline to the liquefaction plant; processing, liquefaction, storage and loading onto specialized liquefied natural gas (LNG) tankers; maritime transport of the LNG, usually over long distances, to the country of sale; unloading of the LNG from the receiving terminal, regasification, storage and delivery to end users by pipeline. These four stages are interconnected and form a chain from the gas well to the end user. Any weak link in the chain can jeopardize the entire LNG project . The ranking of jobs (from most to least risky) are: LNG plant operators (highest exposure to cryogenic hazards, high-pressure systems); pipeline maintenance workers (risk of gas leaks, explosions); cryogenic storage technicians (risks from LNG tanks, potential spills); LNG tanker crews (transportation risks, but controlled environments); safety inspectors (least direct exposure, but high responsibility). The AHP-ELECTRE method systematically ranks jobs based on risk severity, with LNG plant operators typically having the most hazardous role due to their direct handling of liquefaction processes, while safety inspectors face the least direct physical risk.