I saw the changes on the ATFD-H GA drawing and the seal vessels. No problem, please proceed with fabrication. We will fit compressed air on the ATFD-H seal vessels to achieve the right pressure in the barrier liquid. Providing a drawing of the exact location of the seal vessels is difficult since we do not have an autocad layout drawing. We will decide during the installation, keeping in mind that the lines should be < 1000 mm with minimum bents. position seal vessels: above seals.  Regarding cleaning: filling up the vertical ATFD is the common procedure at AVEBE. The first report which mentioned the cleaning procedure with filling up dated back to 2010. The reason of this procedure is that it is not possible to reach all places with the CIP balls. 