ANSI HI-2.3-2000 pdf download American National Standard for Vertical Pumps for Design and Application
Various types of construction are available; either the open type lineshatt (product-lubricated) or the enclosed type lineshaft construction may be used. For a successful installation, great care is necessary in properly defining all the pump’s requirements for the pump manufacturer. Flood control vertical dewatering pumps are usually of the mixed flow or propeller type (see Figures 2.8 and 2.9).
They are normally short seting units capable of high rate-of-flow pumping. This type of pump is partic- ularly suitable for protecting large areas from flooding. It is completely self-priming with the pumping element submerged during flood stage. The enclosed type lineshaft with oil-lubricated con- struction protects the lineshaft bearings from abrasives in the liquid pumped and llows lubrication of the bearings independent from the liquid pumped. The vertical flooo control pump can handle sit-laden flood waters effectively. A well-designed sump is nec- essary. On large pumping stations, it is economically feasible and strongly recommended to perform model sump tests for assurance of sump design integrity.
Many times during fiood stages, the potential loss of electrical power mandates a diesel engine driver in lieu of an electrical motor driver. The diesel engine is coupled to a right-angle gear which mounts on top of the vertical pump. The materials of construction for the pump are gener- ally coated steel fabrications with cast iron bowls and bronze impellers. However, when more corrosive flood water such as sea water is encountered, materials of construction with greater corrosion resistance are recommended.
2.3.2.5 Well service The vertical well pump consists of a pump placed in a circular well (see Figures 2.4 and 2.5). As a minimum, the pump’s first stage impeller is submerged in well water to allow pumping to the surface elevation. When selecting a pump for a specific well, there are a number of considerations for a successful application. The well’s inside diameter and straightness determines what diameter bowl assembly can be safely installed. If the well is suspected to be crooked, a dummy bowl assembly can be inserted to check diametrical clearances.
The well static water level (SWL) and pumping water level (PWL) must be determined prior to selecting the pump length (setting). Both the SWL and PWL are subject to fluctuations due to seasonal changes and/or usage patterns. Therefore, it is important to consult with the local well dillr, pump installer, or the owner for his setting recommendations.
The well pump’s intended use for agricultural, munici- pal, or industrial applications determines the type of well pump selected. Usually, agricultural installations use an enclosed lineshaft (oil-lubricated) type pump on settings deeper than 30 meters (100 feet) or open lineshaft with special bearing material or special prelubrication flush. Shallower settings may use an open lineshaft (product-lubricated) pump.