European Journal of Technology and Design

3-7

Authors: Pavel Yu. Elsukov

The article analyzes logical sequences used in logic and computing. The main objective of the research is to show the relationship between logic, computing and functional expressions. Existence of such connection allows to make a comprehensive analysis of formulas and analytic descriptions. Comprehensive analysis simplifies consistency check of formulas. Existence of relationship between three types of descriptions allows to analyze semi-structured information. The article reveals the contents of a logical sequence used for research. In this article, logical sequence is a general concept related to logic and mathematics.

14-20

Authors: Sergei Yu. Ushiyarov

Centrifugal sectional pumps (CNS) are used for pumping various liquids having properties similar to water in viscosity and activity, as well as chemically active, abrasive-containing and other liquids. This is one of the most common types of centrifugal pumps used in oil and gas fields for pumping oil and water. They are used at booster pumping stations (BPS), central collection and treatment centers for oil and gas (CSPN), at cluster pumping stations (CPS) for pumping water into productive formations, in water and heat supply systems. The prevalence of pumps is explained by their good adaptation in technological processes with pressure requirements changing in time in pipelines. The sectional design of the pumps, when placed in each section of one stage, allows, although in steps, but at relatively short intervals, it is economical to adapt the pump as close as possible to the optimum head. In comparison, with single-stage centrifugal pumps with comparable technical parameters, CNS pumps have smaller diametrical overall dimensions, dimensions and weights of individual assemblies and parts, therefore they are more convenient to maintain and repair.