REALIZED
PROJECTS
The
author, Lyubomir
A. Zdravkov,
is structural engineer with emphasized interest in steel structures. He
has participated in many projects for civil and industrial buildings in
Bulgaria and around the world.
Aboveground steel tanks are significant part of realized projects. The
team managed by Lyubomir Zdravkov finished design of many AST as follow:
1. In 2003
year is finished design of 10 tanks with 33 000 m3
capacity each
one for Banias Refinery, Syria. These tanks are with
single bottom and shell.
- 8 tanks for light oils products are with single deck floating
roof. Diameter of the tanks D = 50,25 m and
height of shell H
= 17,88 m. Steel A573 Gr.70 is used for the shell and annular bottom
plates. Steel A36 - for the floating roof and central bottom;
- 2 tanks are with supported cone roof.
Diameter of the tanks D = 50,25 m and
height of shell H
= 17,28 m. Steel A573 Gr.70 is used for the shell and steel A36 - for
central bottom, roof structure and cover plates.
All tanks are designed, prefabricated and erected according to API Std.
650.
Groups of AST in Banias Refinery
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Structure of supported cone roof
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Spiral stairway |
Single deck floating roof and rolling ladder
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2. In 2005 year is finished design of 38
aboveground steel tanks in Al-Jabalayn and Palogue, Sudan. These
tanks are with single bottom and shell.
- 7 tanks are with single deck floating
roof. They have 52 000 m3 capacity each one and are used
for crude oil storage. Diameter of the tanks D = 60,0 m and
height of shell H
= 18,46 m. Steel A516 Gr.70 is used for the shell and annular bottom
plates. Steel A283 Gr.C is used for the floating roof and central
bottom;
- 31 smaller tanks with fixed roofs. The bottoms, shells and roofs are made from steel A36. All
of these tanks have been erected on earth type foundations.
All tanks are designed, prefabricated
and erected according to API Std. 650.
General view of site in
Al-Jabalayn
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Native workers
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Erection of first
shell course
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Crushed tank by
erection
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3. The author has
participated of design of group of 8 aboveground steel tanks for light
oils with double shell and double bottoms for Kostinbrod, Bulgaria.
Capacities V, diameters D and heights H
of the tanks are different. They are designed according to standard EN 14015:2004 but
shell and bottom are mounted by roll method. Roofs are cone supported,
with one central column.
For more security all vertical joints of shells and catching basins are
transposed on 600 mm.
All tanks have active vacuum system for leak
detection and prevention of pollution of the environment.
Responsible elements like shell, bottom and structure are made from
steel ВСт3пс5 (S235 J0).
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Double steel bottom with separate net
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Steel bridge between
tanks
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Group of steel tanks
with double shell and bottom
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4. In 2009 year is
finished design of 7 aboveground steel tanks for diesel fuels, with
20000 m 3 each one. They are situated in PB "Polykraiste", Bulgaria. Owner of these storage facilities is
"ДРВВЗ". These tanks are characterized by:
- internal shell diameter D = 38,10 m and
height of shell H
= 19,46 m;
- single shell but with double steel bottom;
- all tanks are with single deck floating roof;
- the shell is stiffened at the top by wide stiffening ring. It acts as a service platform, too;
- ladder on shell is spiral, with hot-galvanized steps and gratings;
- continuous access to the roof is realized by rolling ladder, which is beared by supporting structure;
- rotation of the roof is limited by vertical antirotation devices;
- in the shell are mounted two manholes, which provide access into the tanks.
Standard for design of facilities - EN 14015:2004.
All tanks have active vacuum system for leak
detection that watching for punches on steel bottoms.
Aboveground steel tank during erection
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Welding of central bottom plates
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Antirotation devices
and service platform
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Floating roof, rolling ladder
and supporting structure
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