Befesa - Presse

News

07.08.2005

Cepsa contract Befesa for the automated cleaning of a crude oil storage tank and a fuel oil storage tank utilizing its SALT system

Cepsa’s Gibraltar refinery has contracted Befesa Tratamientos y Limpiezas Industriales (Befesa TLI) for the automated cleaning of a crude oil storage tank and a fuel oil storage tank, utilizing its SALT system

The first of the tanks to be cleaned, the 61 m diameter, 20 m high, floating roof crude-oil storage tank YT-108, was handed over to Befesa with approximately 1,200 m3 of sludge inside.

The tank cleaning works were performed in February and march and required a total of 15 days’ operation with the automatic system and some 1,050 m3 of hydrocarbons contained in the sludge were recovered. The final volume of waste following the cleaning process was 150 m3, consisting mainly of inorganic solids, and they were extracted by Befesa TLI personnel and a mixed suction-blower unit over six working days. This waste was treated in the press filters of the treatment plant Befesa TLI has installed in the refinery. The final hydrodynamic cleaning was done over a further 6 days.

Immediately after, the cleaning works began on the 28 m diameter, 19 m high fixed roof fuel oil storage tank YT-109, which was handed over to Befesa with an initial volume of approximately 250 m3 of sludge inside.

The tank cleaning works were performed in April and May and required a total of 9 days’ operation with the automatic cleaning system and 220 m3 of hydrocarbons contained in the sludge were recovered. The final volume of waste following the cleaning process was 30 m3 and these were extracted by Befesa TLI personnel and a mixed suction-blower unit over two working days. This waste was treated in the press filters of the treatment plant Befesa TLI has installed in the refinery. The final hydrodynamic cleaning was done over a further 3 days.

The singularity of this tank is that, in addition to containing fuel oil sludge which is especially difficult to extract and decant utilizing conventional methods, it is a fixed roof tank with heating serpentines on the bottom.

Both tanks were delivered on schedule and to the customer’s full satisfaction, as may be seen by the written congratulations received from the works supervisor. The amounts billed for the works was 222,170.00 euro and 146,420.00 euro, plus the waste treatment.

Befesa TLI’s automated tank cleaning system – SALT – is the technological alternative to the traditional tank cleaning process, with the following advantages:

  • ­Reduction of the cleaning execution period.
  • ­Greater safety as personnel are not exposed to harmful atmospheres and the washing operations are performed in an inert atmosphere.
  • ­Cost savings through the recovery of energy resources, minimization of contaminating wastes and reduction in the time the tank is out of operation.
  • ­Compliance with the most demanding environmental and safety regulation standards.

Befesa, Abengoa's Environmental Services subsidiary, focuses on providing environmental services for the industrial sector and on the construction of environmental infrastructures. It is a listed company and closed 2004 with stock capital in excess of 393 million euro. In 2004, Befesa managed a total of 1,374,000 tons of industrial wastes, a twelve percent increase on the previous year's figure. (www.befesa.es).