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what is used to determine the total number of down comers required when erecting a tower? correct answers Material list What are the two major hazards when opening a sealed vessel? correct answers Pressure differential and product What is the storage method for oxygen and acetylene gas cylinders? correct answers Separated, upright and secured in a designated area What must be obtained before beginning work in any tank or confined space? correct answers Entry permit A w 8x 30 beam is 37ft.9 in. In length and weights 26 lbs/ft. What is the weight of the beam? correct answers 982 lbs What is the weight of an s200 x27x3500 beam? correct answers 5400.0 kg When retubing an evaporator, what is the safest and most efficient method to hoist the tubes? correct answers Use a crane, lifting device and tagline What is the main advantage of lifting with a basket hitch? correct answers It has double the capacity of a single vertical hitch Which configuration is best suited to lift a vessel shell section is 5 ft in diameter and 10 ft in length? correct answers Double gasket hitch Which knot is tied 5/8 in. Rope and a 1/2 in. Rope? Skeet bend correct answers Sheet bend What is the mean diameter ofa cylinder that is be rolled to an od of 74in. When the material thickness is 3/4 in? correct answers 73.25in. A tank is 40 ft. In diameter and 30 ft high. What is done when the gravel base varies by 5/8 in.? correct answers Complete the tank floor and the first ring, then adjust the bed to horizential level In which part of a boiler and hand hole caps or handhole plugs located? correct answers Header Why are curtains aligned after being hung in the precipitators? correct answers To insure the electrostatic feild will operate efficiently How many rafters are to be installed at a chord distance of 6 ft. 3/8in. On a 40ft diameter? correct answers 20 After installing the floor plates in a dry bottom precipitator, what is done? correct answers Remove all dogs and tasks Where are steam separators located? correct answers Inside the steam drum