Guide for Three Methods of Assessing Buried Steel Tanks

2021 ◽  
Author(s):  
Keyword(s):  
Steel Tanks

Modern methods of installation of floating roofs of vertical steel tanks and control of their implementation

2020 ◽  
pp. 42-47
Author(s):  
E.I. Velichko ◽  
◽  
V.V. Dubov ◽  
A.E. Nizhnik ◽  
A.V. Muzykantova ◽  
...  
Keyword(s):  
Modern Methods ◽  
Steel Tanks ◽  
And Control

IMPROVEMENT OF THE OPERATIONAL RELIABILITY OF THE BOTTOM OF VERTICAL STEEL TANKS FOR OIL AND PETROLEUM PRODUCTS

2019 ◽  
pp. 59-65 ◽  
Author(s):  
V.A. Yudakov ◽  
◽  
S.D. Fan ◽  
I.A. Fan ◽  
M.R. Teregulov ◽  
...  
Keyword(s):  
Petroleum Products ◽  
Operational Reliability ◽  
Steel Tanks

Experimental investigation of geometrical and physical behaviors of thin-walled steel tanks subjected to local support settlement

Structures ◽  
2021 ◽  
Vol 34 ◽  
pp. 413-422
Author(s):  
Hamid Naseri ◽  
Hossein Showkati ◽  
Tadeh Zirakian
Keyword(s):  
Experimental Investigation ◽  
Local Support ◽  
Steel Tanks ◽  
Thin Walled

Study of features in weld root formation under double-sided synchronized arc welding of vertical joints of steel tanks

2021 ◽  
pp. 153-160
Author(s):  
O.I. Filippov ◽  
V.A. Erofeev ◽  
M.A. Sholokhov ◽  
S.I. Poloskov
Keyword(s):  
Deep Penetration ◽  
Computer Engineering ◽  
Cross Sectional ◽  
Steel Tanks ◽  
Face Dimension ◽  
Weld Root ◽  
Root Face ◽  
Welding Productivity ◽  
Vertical Up ◽  
Oil And Oil Products

It is shown that increase in the welding productivity of vertical joints of storage tanks for oil and oil products can be achieved due to the double-sided synchronized formation of the X-shaped groove. To minimize various disturbances, including variation of gap size and root face dimension, computer engineering analysis is performed, which showed that the formation of root pass during welding with the movement of the electrode down (vertical down) with increased dimension of the root face leads to lack of penetration, but during groove filling with the movement of the electrodes up (vertical up) deep penetration is achieved given the considerable root face dimension. It is defined that during welding of 30 mm thickness plates with root face dimension range from 6 to 8 mm, it is necessary to ensure the root gap dimension range from 1.5 to 3 mm along the entire length of the seam. In this case, the remaining unfilled cross-sectional area of the groove is small, which makes it possible to fill it in during single pass under two-arc double-sided welding. There is area of double-sided synchronized welding modes in which the occurrence probability of typical defects during the formation of the weld root is minimal.

measurements. This paper is confined to the different forms of sampling odourous gases for olfactometric measurements and the problems involved. It refers to existing guidelines for olfactometric measurements in the countries of the EEC, as well. 2. TYPES OF SAMPLING Samples of odourous gas may be collected in unconcentrated or concentrated form. Concentrated sampling is usually neces­ sary when gas chromatography or other chemical analytical meth­ ods are to be used. Unconcentrated sampling is provided if o-dour threshold concentrations are required (2). Depending on the type of olfactometer used dynamic sam­ pling or static sampling are provided. The principle of dynam­ ic sampling is shown in Figure 1. It requires a part-flow of the odourous gas to be continoulsy extracted from the source and subsequently directed to the olfactometer. This sampling method implies that the measurements are carried out close to the source. An advantage of the method is that there is the possibility of controlling a process, directly, and in case of the break-down of the process this can be noticed right away. A disadvantage of the dynamic method is that odour sources that are not readily accessible require a relatively great ef­ fort in order to install the olfactometer and suitable sam­ pling pipes which often should be insulated or heated to avoid adsorption or condensation (3). When static sampling is used a partial stream of the o-dourous air is collected in a sampling vessel. Samples are taken from this vessel or bag to dilute the odourous air for the olfactometer using syringes or on-line tubings. When using this method odour measurement with the panel can be carried out at any arbitrary location, if the vessel is a transport­ able one. An example for static sampling is given in Figure 2. 3. PROBLEMS OF SAMPLING the main problems encountered when sampling odourous air derive from surface effects of the sampling tubes and vessels, namely by - adsorption, - desorption, and - condensation. This depends mainly on the material of the tube, the vessel or the bag (adsorption) or on the nature of the gas, whether it is hot and/or containes a high amount of humidity (condensa­ tion). On the other hand the sample can be altered by trace components bleeding from the material of the walls of the ves­ sel or the tube (desorption). The following factors are to be observed for valid static sampli ng. aTTTToTce of_m£teri aj_ For tWe sampling of odourous gases glas vessels, stain­ less steel tanks (4) and flexible plastic bags (5) were tested. The initial concentrations of the test gases decrease consider­ ably with storage time in glass and steel vessels. In recent years bags made of Polyethylene(6), Teflon (3) and Tedlar (7), (8) were usually used. Figure 3 shows a graph from SCHUETZLE

1986 ◽  
pp. 59-59
Keyword(s):  
Gas Chromatography ◽  
Storage Time ◽  
Dynamic Method ◽  
The Other ◽  
Plastic Bags ◽  
Steel Tanks ◽  
On Line ◽  
Arbitrary Location ◽  
Adsorption Desorption ◽  
Trace Components

scholarly journals Mine surveying technique and steel storage tank base deformation removal

2021 ◽  
Vol 1 (7) ◽  
pp. 69-79
Author(s):  
Aleksandr I. Barulin ◽  
Keyword(s):  
Low Cost ◽  
Operating Time ◽  
Construction Period ◽  
Steel Tank ◽  
Steel Tanks ◽  
Algebraic Actions ◽  
Minimum Height ◽  
Survey Accuracy ◽  
Tank Bottom ◽  
Mine Surveying

Introduction. Vertical steel tanks are extensively used in oil fields to hold crude oil and other liquids. Their construction requires continuous surveying control. However, measurement procedures, data processing, and deviations and documentation correction are not universal and cannot be applied for tanks with a capacity of less than 3000 m3. Moreover, the process of correcting the detected bottom irregularities is poorly substantiated and intuitive. Research objective is to improve the as-built survey accuracy and reliability of the low-capacity steel tank bottom, substantiate the minimum height of its irregularities, increase the objectivity and productivity of measurement processing, develop an unambiguous method for time-predictable correction of bottom irregularities, and substantiate the optimal contents of its relief’s as-built scheme. Methods of research. Geometric leveling for the bottom profile survey failed to provide adequate accuracy and was therefore replaced by the method of trigonometric leveling. A method has been developed for determining the deviations of the existent tank bottom profile from the design position by means of algebraic actions with surfaces of a topographic order. The accuracy of determining the smallest height of bottom irregularities has been estimated under the tacheometric survey. A method has been proposed for controlling the correction of tank bottom irregularities based on evaluation calculations of bottom deformations by the finite element method. Research results. All the development results are exemplified by a specific production example. It was found that for a full completion of work, two iterations of tank bottom irregularities correction are enough. Methods of optimal design for the facility’s as-built schemes are presented. Conclusions. A simple, accurate, low-cost, productive, and time-predictable method of mine surveying, mathematical processing and correction of deviations in the tank bottom profile has been developed. This technique reduces the construction period and increases the operating time of the facility.

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