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Method for washing the interior surfaces of tanks and containers

  • US 5,896,871 A
  • Filed: 12/15/1997
  • Issued: 04/27/1999
  • Est. Priority Date: 06/15/1995
  • Status: Expired due to Term
First Claim
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1. A method of washing a surface inside a tank, comprising:

  • arranging a washing head in a fixed position inside said tank, which washing head supports a nozzle holder fitted with a nozzle, adapted for ejecting a beam of washing fluid, which nozzle holder supports said nozzle rotatable about a first axis and a second axis, said second axis being oriented substantially perpendicular to said first axis,surveying the surface to be treated by said beam in order to effect the washing, estimating corresponding angular orientations of said nozzle, estimating required dosage levels of beam treatment in respect of selected different zones of said surface,carrying out a washing operation by forcing washing fluid to be ejected through said nozzle while rotating said nozzle holder about said axes in such way that for a full revolution about said first axis said nozzle holder performs an incremental rotational movement about said second axis, until said nozzle has traced a path, by which said beam has scanned substantially all of said surface,monitoring during said washing operation the nozzle holder angular movement along said path, andcontrolling during said washing operation the intensity of beam treatment based on the result of said monitoring in order to adapt it to the respective dosage levels estimated to be required for respective zones.

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