External insulation of spherical tanks of a refinery
Hellenic Refinery in Aspropyrgos (Athens) Greece 
For the insulation of spherical tanks of a refinery in Greece, the task was to coat the tanks with polyurethane in-situ foam using a spray process with an insulation thickness of at least 40 mm.
The tanks, which were welded on site and had a diameter of about 35 m, were found to be heavily rusted. A scaffold had been attached directly to the tanks by the customer by means of welded-on lugs.
the spray foam is applied in several layers. To avoid cold bridges, the metallic parts of the supporting pillars are also foamed.
The first spherical tank has been foamed. The elastomer coating (in white, to prevent heating) has already been sprayed onto the upper half of the sphere.
Finished tank coated with white elastomer.