Water Well Journal
Issue link: http://read.dmtmag.com/i/451364
But from my experience, the higher value is needed to provide the needed safety factor to adequately remove the expelled heat from the higher horse- power motors and to provide a reason- able span value for the average flow rate of variable flow installations using variable frequency drives or control valves, common to many larger pump installations. Table 3 lists common features of vertical holloshaft (VHS) and vertical solid-shaft (VSS) pump electric motors for U.S. standard voltage, alternating current (AC), 60 hertz electric power supplies. Note the corrections for speed, volt- age, and horsepower (kilowatts) are required for 50 hertz or international power supplies or applications. Both Table 2a and Table 3 are in- tended to aid the system designer with the available types, sizes, and nomen- clature of the various electric motors used for driving vertical turbine and submersible well pumps. Typical thrust ratings are provided for estimating the capacity of a motor against a selected pump's downthrust, and the motor frame and size is provided to verify the motor's fit onto a vertical turbine pump's discharge head. The specific technical data associated with the above general data can gener- ally be provided by the pump and motor supplier or manufacturer during the evaluation and selection process. Finally, please note the data con- tained in Tables 1, 2, and 3 are intended to provide a general guide for selecting and matching the proper pump and motor and riser pipe diameter (sub- mersible) or pump bowl and column pipe diameter (VTP) to a new or exist- ing well casing or liner diameter. Addi- tional and critical design considerations such as installation depth, drop cable sizing, length, and type for submersible pumps or installation depth, line shaft size, and type for vertical turbine pumps must be conducted. It is my sincere hope the information contained in these tables will provide some meaningful assistance to you in making your next selection of a large well pump. Our next installment will cover a rec- ommended procedure I developed for determining the cross-sectional space al- location for various kinds of riser pipe and drop cable available for submersible well pump installations or column pipe and accessories for VTP installations as well as some guidelines for verifying the basic well design. Until then, keep them pumping! DACUM Codes To help meet your professional needs, this article covers skills and competencies found in DACUM charts for drillers and pump installers. DO refers to the drilling chart and PI represents the pumps chart. The letter and number immediately following is the skill on the chart covered by the article. This article covers: DOA-3, DOB-2, DOB-3, DOB-4, DOF-1, PIA-4, PIB-4, PIC-5, PIC-6, PIF-6 More information on DACUM and the charts are available at www.NGWA.org. WWJ Ed Butts, PE, CPI, is the chief engineer at 4B Engineering & Consulting, Salem, Oregon. He has more than 35 years experience in the water well business, specializing in engineer- ing and business management. He can be reached at epbpe@juno.com. WWJ February 2015 49 Twitter @WaterWellJournl 2215 S. Van Buren · Enid, Oklahoma, USA 73703 · Phone 580.234.4141 · domsales@gefco.com · intsales@gefco.com · www.gefco.com an Astec Industries Company GEFCO, Inc. presents: The 18th Annual Resource Drilling Fundamentals Training Seminar, May 18-22, 2015. Course Materials collaborated by GEFCO, Inc. and Sir Sandford Fleming College. COURSE CURRICULUM NEW TOPICS: Modern Drilling Methods · Anatomy of Drilling Fluids · Selection of Solids Control Pumps, Grouts, Ground Formations · Drill Site Set-Up · Drill Rig Maintenance · Identification & Examples of Drilling Methods Fundamentals · Identification of Drilling Systems Drill Rig Specifications Drillstring Components Down Hole Drilling Fluid Drilling Air Drilling Geotechnical and Environmental Exploration Air Compressor Types and Applications · Mud Pump Types and Applications · Geology and Hydrology · Mud Rotary Demonstration · Other Drilling Systems