Blast cleaning with MEC SHOT Vacuum Blasters have proceed to be a novel and highly effective method of cleaning ships' decks prior to applying protective coatings, without stopping other work on board. Likewise, shot peening is a solution to retard stress corrosion failure of ship hulls. By virtue of size and non movement of such jobs into the blast room, the blasting operation becomes difficult. Therefore, mobile closed circuit vacuum blast machine is the right solution.