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Vol 234
Pages:
637-642
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RUS ENG
Research article
Oil and gas

Natural ventilation of gas space in reservoir with internal floating roof

Authors:
M. G. Karavaichenko1
N. M. Fathiev2
About authors
  • 1 — Ph.D., Dr.Sci. professor State Oil Technical University
  • 2 — Scientific consultant ZAO «Neftemonatzhdiagnostika»
Date submitted:
2018-07-21
Date accepted:
2018-09-14
Date published:
2018-12-25

Abstract

The article deals with safe operation issues of vertical steel reservoirs with an internal floating roof when storing volatile oil products. The purpose of the work is to study the influence of ventilation openings area and wind speed on the duration of explosive state of vertical reservoirs with an internal floating roof. The influence of ventilation pipes' dimensions and the wind speed on the duration of explosive state of the reservoir has been studied. Method for calculating this time is proposed. It is shown that natural ventilation of the reservoir gas space is caused by the effect of two forces, which are formed due to: 1) the density difference between the vapor-air mixture in the reservoir and outside air; 2) wind pressure occurring on the roof of the reservoir. An algorithm for calculating the duration of reservoir being in an explosive state with wind pressure and no wind is obtained. The greater the difference in geodetic marks of the central and peripheral nozzles, the more efficient the ventilation. This distance will be greatest if the lower ventilation pipes are located on the upper belt of the reservoir or the reservoir is equipped with an air drain. Increase in wind speed of more than 10 m/s does not significantly affect the duration of the reservoir being in an explosive state. Increasing the diameter of the central nozzle from 200 to 500 mm can significantly reduce the duration of the reservoir degassing in windless weather.

Keywords:
vertical steel reservoir with internal floating roof explosive state of the reservoir ventilation pipes natural ventilation time
10.31897/pmi.2018.6.637
Go to volume 234

References

  1. Reservoir ventilation: A chemist’s guide of the nineteenth century. Khimiya i khimicheskaya tekhnologiya. URL: www.chem21.info (date of access 04.07.2018) (in Russian).
  2. Evtikhin V.F., Malakhov S.G. A reservoir with a capacity of 10 thousand m3 with a floating roof of increased buoyancy and ventilation above-roof space. Transport i khranenie nefteproduktov i uglevodorodnogo syr'ya. 1984. N 5, p.3-5 (in Russian).
  3. Volkov O.M., Nazarov V.P., Shatrov N.F., Shukhatovich A.D Investigation of the ventilation process of reservoirs with petroleum residues. Transpot i khranenie nefteproduktov i uglevodorodnogo syr'ya. 1980. N 2, р. 9-12 (in Russian).
  4. Kirshev A.A. Reducing the fire and explosion hazard of the ventilation process of cylindrical reservors with petroleum products: Avtoref. dis. … kand. tekhn. nauk. Akademiya gosudarstvennoi protivopozharnoi sluzhby. Moscow, 2014, р. 22 (in Russian).
  5. Kluban' V.S. Nguen Le Zui. Ensuring fire safety of reservoirs with floating rood at Vietnamese oil depots. Tekhnologii tekhnosfernoi bezopasnosti: Internet-zhurnal. 2016. Iss. N 5 (69). URL: http: // ipb. mos. ru/ttb (date of access 4.07.2018) (in Russian).
  6. Nazarov V.P., Kirshev A.A. Ventilation of reservoirs before repair work. Tekhnologii tekhnosfernoi bezopasnosti. 2012. N 4 (44), p.1-4 (in Russian).
  7. Nazarov V.P., Kirshev A.A Improving the ventilation efficiency of reservoirs with petroleum products. Pozharovzryvoopas-nost'. 2014. Vol. 23. N 7, р. 52-57 (in Russian).
  8. Zagrutdinova L.G., Fatkhiev N.M., Yakhin Yu.M., Muslimov Kh.M. Experimental study of the oil loss from a floating rooа reservoir. Transport i khranenie nefti i nefteproduktov. 1977. N 5, р. 47-49 (in Russian).

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