English

Vol. 7 4, 2017 p 26-34

Pages

Article name, authors, abstract and keyword

26-34

Floating roofs of tanks: effectiveness analysis and development directions

Ruben Z. Gadelshin a

a STC Transneft R&D, 144/3 Oktyabrya prospect, 450055, Ufa, Bashkortostan, Russian Federation

https://doi.org/10.28999/2541-9595-2017-7-4-26-34

Abstract: At storage of oil and oil products in the surface vertical cylindrical tanks the losses of the product take place due to its evaporation. For losses reduction the roofs are used which float on the surface of the stored product (floating roofs-FR). In the tanks with the stationary roof the internal FR (IFR) of various structures are used. Despite the variability of existing designs and materials, in Russia there are no reasonable criteria for FR design selection, which would allow to minimize the product losses at storage. The methods of calculation of losses from evaporation do not take into account the impact of IFR design on the value of losses. The critical task is to formulate the requirements to the structural design of IFR and development of coatings improvement directions, aimed at the increase of their effectiveness, reduction of ecological damage, securing of the safe operation of the tank batteries.
In this work the tanks IFR are classified and foreign regulatory documents and publishings on this subject matter are analyzed, including the estimation of the results of efficiency definition for various FR designs in the surface tanks.
For IFR efficiency increase it was proposed to replace the bolted joints of modular IFR with the welded ones, increase the tightness of bolted joints and (or) reduce their length, eliminate the floating supports of internal IFR, using the system of hangers as an alternative.
It is reasonable to divide the design of aluminium IFR into three types:
for mounting in the tank under construction,
for mounting in the tank under repair,
for mounting in the operated tank. The results obtained in operation will allow to define the criteria and values of IFR efficiency and to establish reasonable technical requirements to the coatings. In its turn it will contribute to the improvement of IFR characteristics, reduction of ecological damage and increase of tanks operation safety.
The results of investigation can be used at development of reasonable requirements to FR parameters and design and will be in demand by the specialists of R&D and operating companies.

Keywords: vertical tank, floating covers, floating roofs, losses from evaporation

Reference for citing:
Gadelshin R. Z. Floating roofs of tanks: effectiveness analysis and developement directions. Naukatekhnol. truboprov. transp. neftiinefteprod. = Science & Technologies: Oil and Oil Products Pipeline Transportation. 2017; 4(7):2634.

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