Determination of the amount of oil product vapours from the tank based on monitoring the operation of the breathing valve

Abstract

The development of methods for calculating losses of oil and petroleum products vapours from the tank has been going on for a long time. Systems that allow for more accurate calculations are also being developed along the way. In each country, and sometimes in each company, there are their own methods for determining the loss of light hydrocarbon fractions from losses from the tank through the breathing valve. In addition, losses are divided into “working losses” and “standing losses”. In each technique, there are both pros and cons. The most characteristic disadvantage of each technique is its applicability only to the conditions in which it was developed, due to the presence of correction coefficients. This article proposes a new technique for determining the loss of hydrocarbons vapours from the tank through the breathing valve, both from “working losses” and from “standing losses”. In the course of the work, formulas were obtained for calculating the flow rate Q∆P,h through the breathing valve, which depends on the degree of opening of the pressure plate and overpressure. An experiment was conducted, instrumentally proving the application of the developed methodology. And also, the equipment is selected and recommendations on its installation and use are given.

Analysis of methods for accounting for the amount of evaporation of petroleum products from the tank

“…In the course of the work, two variations of opening the pressure plate by half and completely were considered, which is demonstrated in (Fig. 3), where the main conclusions obtained during the work are also recorded [17]. So, during a series of experiments with changing the position of the pressure plate and the overpressure inside the tank, a dependence of the form 𝑄 ∆𝑃, ℎ was obtained, which is presented graphically for easier perception (Fig.…”

“…As noted earlier, one of the priority tasks of this study is to improve the existing methods of automatic accounting for the evaporation of hydrocarbons from the tank. In a previously performed work [17], where the authors obtained 2 equations using the ANSYS software package describing the relationship between the flow rate of the gas-air mixture exiting through the breathing valve as a result of evaporation, pressure and the degree of opening of the pressure plate 𝑄 Δ𝑃, ℎ where Δ𝑃 is the overpressure, ℎ is the opening height of the pressure plate. In the course of the work, two variations of opening the pressure plate by half and completely were considered, which is demonstrated in (Fig.…”

“…To implement the proposed technique, it is necessary to install an overpressure sensor, a concentration sensor and an accelerometer, the brands of equipment and their location are considered in [17] and the main idea is as follows. When the overpressure in the tank reaches the lower limit of the operating range of the breathing valve, namely, at the moment of opening the pressure plate, the recording of sensor readings begins every second: concentration, position of the plate and overpressure.…”

The effect of physical properties of lost petroleum quantities in vertical tanks at (NRC) Baiji

“…“Working losses” are caused by emptying and filling, and “standing losses” are brought on by changes in temperature during the day. Oil and oil products (O&OP) evaporate from reservoirs and causes economic losses, environmental contamination, and a decline in the physical and chemical characteristics of the stored commodity (Glushkov, 2022). Evaporative losses account for more than 50% of operational losses.…”

“…For correct computations, different businesses across the country employ various techniques. Due to the fact that the composition of the product varies during evaporation, detailed calculations are required in order to determine the precise residual of the product contained in the tanks (Glushkov, 2022). Physical properties are considered one of the most important factors affecting the losses in quantities of petroleum products in general.…”