The accompanying illustration is that of a new American turbine driven centrifugal hot well pump. It may be stated that for the high vacuum required by steam turbines it has been found desirable, especially in large installations, to use separate pumps for drawing the condensed steam and the air from the condenser; forming what is known as the "Dry Vacuum System." The air is handled by an engine driven reciprocating air pump and as no water is handled the clearance can be made smaller, thus obtaining a high efficiency. The water is usually handled by a centrifugal hot well pump, which is drawn by an electric motor in the case of electric plants, on shore as it reunites a high speed of radiation. It is held that in using the dry vacuum system on turbine driven vessels, it was considered objectionable to use a motor to drive the centrifugal hot well pump on account of the dampness and high temperature of the engine room; therefore direct drive by a steam turbine was used. The illustration shows the complete set as made by the propelling machinery which consists of Curtis marine turbines. It will be also seen that the pump end consists of a 4-iu. Worthington two stage centrifugal pump arranged to work with shaft vertical. I be turbine is a two stage Curtis turbine mounted above and directly connected to the pumpIt is stated that the entire set requires floor space of only 3 feet square and is 9 feet high over all. It is rated to deliver 300 gallons of water per minute from a 29-inch vacuum and has a large overload capacity. The total weight is 5,850 pounds and speed is 1,-00 revolutions per minute.

The accompanying illustration is that of a new American turbine driven centrifugal hot well pump. It may be stated that for the high vacuum required by steam turbines it has been found desirable, especially in large installations, to use separate pumps for drawing the condensed steam and the air from the condenser; forming what is known as the "Dry Vacuum System." The air is handled by an engine driven reciprocating air pump and as no water is handled the clearance can be made smaller, thus obtaining a high efficiency. The water is usually handled by a centrifugal hot well pump, which is drawn by an electric motor in the case of electric plants, on shore as it reunites a high speed of radiation. It is held that in using the dry vacuum system on turbine driven vessels, it was considered objectionable to use a motor to drive the centrifugal hot well pump on account of the dampness and high temperature of the engine room; therefore direct drive by a steam turbine was used. The illustration shows the complete set as made by the propelling machinery which consists of Curtis marine turbines. It will be also seen that the pump end consists of a 4-iu. Worthington two stage centrifugal pump arranged to work with shaft vertical. I be turbine is a two stage Curtis turbine mounted above and directly connected to the pumpIt is stated that the entire set requires floor space of only 3 feet square and is 9 feet high over all. It is rated to deliver 300 gallons of water per minute from a 29-inch vacuum and has a large overload capacity. The total weight is 5,850 pounds and speed is 1,-00 revolutions per minute.

If you are a current subscriber, login here to access this content.

If you would like to become a subscriber, please visit us here.