ROVATTI PUMPS | Vertical lineshaft pumps

Definition of vertical pumpsAll vertical pumps contain one or more bowls (diffusers); The pumps are equipped with one of the following four types of impellers: radial flow modified radial flow (turbine pumps) mixed flow axial flow (propeller pumps) The pumps, particularly the radial flow and modified radial flow types, are usually designed for multistaging, by bolting or threading individual bowls together The pumping element (bowl assembly) is usually suspended by a column pipe, which also carries the liquid from the bowl to the discharge opening; The driver is mounted either: on the discharge head (lineshaft pumps) directly to the bowl assembly, either above or below (pumps with submersible motors) in a horizontal configuration, such as an electrical motor or engine, driving through a right angle gear Types of vertical pumps Vertical pump types. Deep well (lineshaft) This type of vertical pump is commonly installed in a drilled and cased well. Its function is to lift liquid (usually water) from the water level in the well to the surface and provide a specified discharge pressure at the surface. The pumping element consists of a single or multistage bowl assembly and is located below the lowest liquid level. The bowl bearings are usually lubricated by the pumped liquid. The column pipe and lineshaft assembly is either an open type product lubricated assembly or enclosed type oil or external liquid lubricated assembly. The column pipe is supported at the surface by a discharge head. The discharge head directs the water from vertical to horizontal flow and also supports a driver. A shaft sealing arrangement is contained within the discharge head. This type of pump is self-priming. Wet pit, short setting or close-coupled (lineshaft) This type of vertical pump usually is suspended in a wet pit. The pumping element can be fitted with a bowl assembly of any desired specific speed. Normally the bowl assembly bearings are product-lubricated; however, they can be force-lubricated by grease, water or other lubricants. The column pipe assembly supports the bowl assembly and houses a lineshaft. The lineshaft bearings are usually open type, product-lubricated. However, enclosed type lineshaft, force-feed lubrication with oil, grease or water may also be supplied. A shaft sealing arrangement is contained within the discharge head on product-lubricated pumps. This type of pump is self-priming. Barrel or can (lineshaft) This type of pump is mounted in an enclosed container (barrel or can) and generally is used in booster applications and where inadequate suction pressure conditions exist. The can pump contains the same pumping elements and column pipe as the wet pit type pumps. The lineshaft bearing assembly is almost always product-lubricated. The discharge head performs the same functions as the wet pit head except the base is sealed to atmosphere. Liquids other than water are commonly pumped by this type of pump. This type of pump is very effective where inadequate system NPSH is available. Additional NPSH is created by extending the pump can length and bowl assembly to create additional submergence (suction head). Submersible This type consists of an electric drive motor coupled directly to the bowl assembly. The driving "submersible type" motor and bowl assembly are designed to be submerged in the liquid pumped. The pumping element usually is of the turbine bowl design; however, mixed flow and propeller types are also available. This type of unit is normally used in wells and occasionally for wet pit or canned booster service.