METHOD OF MANUFACTURE OF METAL TANKS AND DEVICES FOR ITS REALIZATION Russian patent published in 1998 - IPC

FIELD: manufacture of tanks for petroleum products and other liquids. SUBSTANCE: coating is applied by flame spraying in stages. After sand-blasting of blanks before their welding in panels the stage of coat spraying in strips onto blanks is accomplished simultaneously on two sides with an overlap of strips at least by half the blank thickness, leaving areas of non-sprayed surface around the edges of each blank with a width equal to the blank thickness. After sand-blasting of panel welds the stage of coat spraying onto the panel welds is effected. After sand-blasting of circumferential welds welding the neck to the roof application of coatings onto them and heat affected zone is accomplished, and after welding of the shell longitudinal weld and welding of the bottom and roof to the shell the stage of coat spraying after sand-blasting of welds onto the tank longitudinal and circumferential welds and heat affected zone is carried out. Coating of the same thickness as on the blanks is sprayed with an overlap of the sprayed strips by the value equal to half the blank thickness. Coat spraying of all stages is accomplished in sealed chambers with removal of metal dust from the zone of treatment. For realization of the method provision is made for a device for application of coats on plane surfaces. The entire blank is coated simultaneously on two sides. A device is provided for application of coating onto welds, device for treatment of neck welds, device for spray coating of outside circumferential welds, and a device for application of coating onto inside circumferential weld of the tank. EFFECT: facilitated procedure. 7 cl, 7 dwg