FIELD: mechanical engineering; protection of equipment operating under pressure. SUBSTANCE: equipment has inner chamber for keeping processing liquid enclosed in housing able to withstand pressure, equipped with drain channels and made of material corrosion-affected at contact with processing liquid in process of operation. Housing is coated with anticorrosive from inner side made from several elements welded to each other. Weld seams of lining are completely isolated from contact with processing liquid in process of normal operation by covering with mated straps (or plates) of the same material which is used in making the lining or other corrosion-proof material welded to lining. Straps are hermetically welded by edges to each other and to lining. Arrangement of straps and their edge weld seams are such that they form grid of below lying clearances communicating with each other and with at least one drain channel. EFFECT: improved reliability and increased service life of equipment operating under pressure. 22 cl, 1 ex
