Water Well Journal
Issue link: http://read.dmtmag.com/i/451364
vertical turbine pumps. The right side shows the flow range for the various pumps and riser or column sizes. Once again, please remember the well casing or liner diameters are based on a typical actual outside diameter (9.5 inches for a 10-inch or 5½ inches for a 6-inch nominal size) for most manufac- turers. However, some models may actually be larger than the nominal size or may not easily fit inside of a tight, incrusted, or crooked well. This column is specifically intended to assist the designer with determining the minimum size of any well casing based on the associated nominal pump bowl diameter along with the maximum flow rate an installation can accommo- date. In all cases, verification of the well's actual inside diameter, pump bowl and motor (for submersible instal- lations) diameters, and riser and drop cable or column pipe sizing, must be performed. (5) Optimum Well Casing/ Liner Diameter This column is used to assist the well designer for sizing of a new well with the selection of the well casing or liner diameter for a given flow rate and pump style and type. The sizes shown on the left side are for the best overall selection of well casing or liner diameter (based on a blend of economic, pump and riser/column pipe clearance, and likeli- hood of some well misalignment con- siderations) for the pump chamber to accommodate the well pump, riser or column pipe, drop cable, and other addi- tional devices such as an airline, low- water probes, etc.—not the well screen or related devices. The selection and sizing of the well screen tailpipe and screen riser pipe must be conducted based on the aquifer type, characteris- tics, and projected yield. The right side demonstrates the target or desired well yield based on the flow range associated with each pump selec- tion and the maximum flow rate for each riser or column size. For 12 inches and larger well sizes, the two well sizes shown relate to the sizes of the associ- ated size of the riser/drop cable or column pipe also shown. For example, the suggested size of well casing for a new well planned to use a 10-inch nominal bowl diameter with a 1750 RPM vertical turbine pump (VTP) and motor is shown as 12-inch ID/14-inch OD (5–8-inch C) with a range of 200-1200 GPM. This basically translates to mean a new water well constructed with a 12-inch inside diam- eter (ID) well casing is adequate for the lower flow range indicated of 200 GPM with a VTP equipped with 5-inch col- umn. However, the highest flow shown of 1200 GPM will require 8-inch pump column (C), which equates to the rec- ommended use of a 14-inch outside diameter (OD) well casing. Please re- member prudent judgment of the well casing and pump bowl selection must always be employed when working between the flow ranges. (6) Use VTP Driver or Nominal Size and Speed of Submersible Motor This is used to assist the designer with the selection of the motor and its vital statistics for a submersible or verti- cal turbine pump application. Shown are the various diameters of submersible pump motors available for the associ- ated pump bowl diameters and required horsepower or a driver for a VTP installation. ENGINEERING from page 45 46 February 2015 WWJ waterwelljournal.com Table 2a. Submersible Well Pump Motor Data—60 Hertz Nominal Motor Dia. Typical Diameter Minimum Well Dia. HP Range NEMA Fit? RPM/Poles Commonly Available Voltages (VAC) Phase 3" 2.80" 3"I.D. 0.33-2 HP 3600/2 115-230 1 4" 3.75" 4"I.D. 0.33-5 HP Yes 3600/2 230 1 4" 3.75" 4"I.D 1.5-10 HP Yes 3600/2 230-460 3 6" 5.75" 6"I.D 5.0-15 HP Yes 3600/2 230 1 6" 5.75" 6"I.D. 5.0-60 HP Yes 3600/2 200-230-460-230/460(Dual) 3 8" 7.70" 8"I.D. 40-200 HP Yes 3600/2 200-380-415-460-575 3 8" 7.70" 8"I.D. 7.5-75 HP Yes 1800/4 200-230-380-460-575 3 NEMA/NON-NEMA Submersible Motor Configurations—>10" Diameter 10" 9.13" 10"I.D. 100-350 HP Yes/No 3600/2 200-230-380-460-575 3 10" 9.13" 10"I.D. 30-250 HP Yes/No 1800/4 200-230-380-460-575 3 10" 9.13" 10"I.D. 35-120 HP Yes/No 1200/6 200-230-380-460-575 3 12" 10.86" 12"I.D. 150-420 HP Yes/No 3600/2 200-230-380-460-575 3 12" 10.86" 12"I.D. 75-350 HP Yes/No 1800/4 200-230-380-460-575 3 12" 10.86" 12"I.D. 85-200 HP Yes/No 1200/6 200-230-380-460-575 3 14" 12.79" 14"O.D. 250-600 HP Yes/No 1800/4 380-460-575-1000-2130-4160 3 14" 12.79" 14"O.D. 150-650 HP Yes/No 3600/2 380-460-575-1000-2130-4160 3 16"-22" Varies with Dia./Motor Mfr. 85-2000 HP 3600/2-1800/4 200-230-380-460-575 3 16"-22" Varies with Dia./Motor Mfr. 85-2000 HP 1200/6-900/8 1000-2130-4160 3 Typical submersible motor manufacturers: Alstra, Franklin Electric, Grundfos, REDA, SME, Flowserve (Pleuger), Karlington, Hitachi, Byron Jackson