Methodology and algorithm for calculating and selecting of pumping aggregates for storage tanks of liquid products

Abstract

This article presents a methodology for calculating the basic parameters and selecting of centrifugal pumping units for filling (emptying) storages of liquid products (for example, vegetable oils). Centrifugal pumping units are widely used in the operation of tank farms for various needs of the national economy, in particular, for temporary storage of liquid products in sea and river ports when they are transshipped from land transport to ships, or from ships to land transport. As an example, the projected storage of vegetable oils in the port of Yeysk (Azov sea, Krasnodar region, Russian Federation) is given. The methodology includes the calculation of average fluid velocities, linear and local hydraulic losses in the intake and pressure pipelines, pipeline diameters, pump performance, the pressure created by it, electric drive power; equipment selection. Based on the proposed methodology, an algorithm has been created for calculating and selecting a pumping unit for transporting of liquid products from vehicles to a storage tank, or vice versa. The methodology and algorithm discussed in this article can be used in the design of storage facilities for various liquids at manufacturing plants, transshipment bases, etc.

Development of simulation models of the hydraulic system of passenger and transport aircraft in normal and failure situations

“…The theoretical basis for simulation modeling of an aircraft hydraulic complex is a graphical-analytical method for analyzing and calculating the operating modes of hydraulic systems [1]. When implementing this method, it is required to determine the load (expenditure) characteristics of the elements of the hydraulic system and the magnitude of the loads acting on the output links of the actuators (△ 𝑝𝑝(𝑄𝑄)).…”

Peculiarities of calculation and design of smooth orthotropic panels with considering geometric nonlinear behavior

“…At pxyδ=qxy in the case of small deflections, from the last equality we have the expression + + (17) and considering further the system of equations (18) It is possible to determine the critical parameters of wave formation and solve the problem of stability for an orthotropic panel under the action of tangential flows qxy and then solve the problem of geometrically nonlinear behavior of the delamination of an orthotropic structure under shear, taking into account the chosen boundary conditions, taking into account the elastic foundation [19]. Note that the procedures of the design technique for a panel loaded with tangential flows can be written in the following form.…”

Selection of design parameters of the system for changing the supply of power supplies for hydraulic systems of aircraft

“…Changing the displacement of a piston pump is usually carried out by changing the geometric stroke of the piston or by changing the stroke of the piston. In the practice of pump engineering, the first method is most common, when by changing the angle of inclination of the washer or cradle of the cylinder block in axial piston pumps and the eccentricity in radial piston and vane pumps, a change in the geometric stroke, and, consequently, the working stroke of the pistons is achieved [4].…”