I don't understand the operating range on a pump curve

Discussion in 'Pumps and Tanks Well Forum & Blog' started by jam0012, Mar 15, 2013.

  1. jam0012

    jam0012 New Member

    Messages:
    1
    Location:
    Birmingham, AL
    Hi everyone. I am brand new to pump sizing. I'm currently attempting to size a pump to transfer water from one 4 ft tall 300 gallon tank to another one. The issue is that I cannot find a pump that has the appropriate operating range for a total dynamic head of less than 10 ft. I'm looking at about 5 ft of TDH and I want a flow rate of 100 gallons per minute. Should I buy a pump that will operate at this flow rate with more head? I don't really understand why any pump curve stops before reaching the x-axis. If the pump can handle 25 ft of TDH, why not 2.5 ft? Thanks in advance for your help.
  2. VAWellDriller

    VAWellDriller Member

    Messages:
    171
    Location:
    Richmond, VA
    The pump curve shows the most efficient operation of the pump, the reason they want some head, is to transfer load properly to the appropriate bearings. The phase power has nothing to do with the pumping.....all you'll need is probably a 3 hp, and there are plenty of options for single phase motors, either on centrifugal pumps or submersible. Don't forget about friction loss when calculating head.....100 gpm through 2"discharge piping will help alot creating head. Call a real pump sales company.....Berkely will build a pump to meet any conditions you give them, and this should be an easy project.
Similar Threads: don't understand
Forum Title Date
Pumps and Tanks Well Forum & Blog I Am 99% Sure I know the Problem, But I Don't Want To Admit It. May 9, 2014
Pumps and Tanks Well Forum & Blog Something is leaking and I don't know what to call it Oct 9, 2011
Pumps and Tanks Well Forum & Blog Losing Pressure with my jet pump and don't know where the heck is the well. Sep 8, 2010
Pumps and Tanks Well Forum & Blog Connecting Two wells- controls don't cut out properly Sep 11, 2005
Pumps and Tanks Well Forum & Blog Help Me Understand My Well Water Level - Please Jun 1, 2014

Share This Page