Tag Archives: магистральный трубопровод
Since the beginning of the era of the development of Western Siberia designers and builders of various linear structures encountered with conditions of weight construction – permafrost, moorland and plenty of natural obstacles (water reservoirs, lakes, rivers and streams). Pipeline construction has felt it on itself – any error in the calculations could lead to losing of stability of the structure in the longitudinal direction. To ensure the design position of the pipeline began to develop special designs ballasting devices and anchors, each of which has some shortcomings, limitations on the use of technology and features of the work. Scope of each design, the calculated position, as well as their geometric characteristics were specified in the technical standards of the time. Currently, the use of a ballasted device requires to confirm the technical and economic calculation, and the number of the means of anchors significantly decreased.
This article describes how to anchorage the buried trunk pipelines in the swamps. For this purpose we consider the classification of swamps, the area of distribution, and the appropriate constructive ways of laying trunk pipelines and forms out of the design position. Considered used at different times means ballasting and secure the lines and offers their classification. According to the analysis of structures set their shortcomings and propose a new design of the vacuum anchoring device embodying the pipeline design position in the swamps. The principle of operation is based on the design of the bearing capacity of the soil and the suction phenomenon arising between the anchors and the foundation soil.
THE IMPROVEMENT OF THE METHOD OF ESTIMATION OF FIRE RISK PIPELINE ON THE EXAMPLE OF OJSC JSC “TRANSNEFT”
In the Russian Federation transition to the practice of flexible regulation occurs gradually in the field of fire safety. In connection with the adoption in 2008 of the Federal law № 123-FL «Technical regulations on fire safety requirements» of great importance for the development and implementation of the domestic practice of evidence-based methodologies of quantitative fire risk assessment that allows you to match the actually existing level of risk of legally established limit value.
The procedure of calculation of individual fire risk is determined by methods approved by orders of the Ministry of emergency situations of Russia No. 382 No. 404. However, in cases of risk assessment of linear facilities (pipelines, roads, and so on) it is rational to apply the above techniques in conjunction with specialized documents.
In this paper we propose an algorithm to estimate values of fire risk on pipelines using existing EMERCOM of Russia dated 10.07.2009 No. 404 in conjunction with a specialized methodology for risk assessment of oil pipelines adopted by the Order of OJSC JSC «TRANSNEFT» from 30.12.1999 No. 152. This approach to determining the values of fire risk will enable to estimate the mass of combustible material capable of spillages to participate in the settlement scenario, since the application of the Order of OJSC JSC «TRANSNEFT» from 30.12.1999 No. 152 allows us to calculate not only the volume of oil spilled before closing the valve (in pressure mode), but after its closure (by gravity).
Was carried out comparative calculations showed that the values of fire risk, obtained without taking into account the amount spilled by gravity oil (without application of the Order of OJSC JSC «TRANSNEFT» from 30.12.1999 No. 152) are low, which further led to underestimation of the scale of the accident, as well as the possible number of affected people.
CALCULATION OF THERMAL AND HYDRAULIC LOSSES ON LENGTH OF NONISOTHERMAL MAIN OIL PIPELINE AND LABORATORY BENCH OF MODEL REAL OIL PIPELINE
Thermal-hydraulic calculations of technological modes of pumping play an important role in the selection of economically optimal and safe modes of oil transportation through main pipelines This is especially true for non-isothermal pipelines and abnormal oil of complex rheology. Urgent task is testing methods of improving of high-paraffinic and high viscosity oil rheological properties by physical-chemical influences. In this paper an attempt is made to apply software package Schlumberger PIPESIM to calculate the friction loss and temperature drop in non-isothermal main pipeline. As an example, the main pipeline “Transneft-North” “Usa-Ukhta” was chosen. It is shown that such a complex can be used to evaluate the thermal and hydraulic losses on the real line, although further investigation are required in order to achieve a satisfactory agreement between the calculated and actual data.
In the paper the hydraulic friction losses and losses on the local resistance in the flow of oil through the tube laboratory bench are also calculated. This lab scale tubing installation was created in Ukhta State Technical University to investigate the influence of physical fields and chemical agents on the rheological properties of high-viscosity and high-paraffinic oils of Timan-Pechora oil-gas province. It is supposed to treat of oil pipe flow by ultrasound and magnetic fields, adding depressants, and by thermal heating.
For processing of magnetometric signals during remote diagnostics of underground steel pipelines, parametric wavelet functions of algebraic type were applied. It made it possible to reduce in several times the level of random noise and to improve significantly trustworthiness of evaluation of the stress-strain state of the underground steel pipeline metal.
Some matters of optimization of magnetometric testing method for stress-strained state of underground steel pipeline
The analytical expressions for calculating the complex sensitivity and noise immunity magnetometric method contactless control VAT metal underground steel pipeline. The variants of schemes for measuring the magnetic field line. To ensure high sensitivity and noise immunity magnetometer measurements recommended measurement scheme with the location of the magnetic field transducers of extremes spatial components of the magnetic field.