Considerations for Choosing the Right Dosing Pump

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Considerations for Choosing the Right Dosing Pump
Pump Selection and Control Basics

• How to pick it,

Install it,
And keep it running,
Presented by Darren Meyers, P.E. - Zoeller
Company
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Why Pump

• Necessity
• Pressure Dosing
• Enhanced Flow
• Hilly Site Profile
• Enhancement
• More Control
• More Options
• Aesthetic Reasons

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Separating the Good from the Bad

• Pumps are available everywhere
• Truth
• Junk components make a Junky System
• (You really do get what you pay for)
• What to look for

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Part What Makes a Pump Good?

• Quality Design
• solid engineering
• 2. Quality Construction
• superior materials
• sound workmanship
• Proper Application
• right pump for the right job

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Manufacturers

• Many good options
• Myers, Zoeller, Goulds, Barnes, Sta-Rite, etc.
• Also many poor options
• Look For
• Track Record in the industry
• Commitment to quality
• Product Selection
• Industry involvement (SSPMA, etc.)

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Overall Pump Design

• Solids Capability
• Internal clearances
• Inlet restrictions
• Oil filled vs. Air filled
• Oil runs cooler
• Air is potentially cleaner
• Switches
• In dosing applications, adjustable switches are
  better than preset

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Part Three Keys to a Good System

• Proper Pump Selection
• Picking the right pump for the job
• 2. Correct Installation
• Clean, safe, organized
• 3. Adequate Maintenance
• Keeping a pump in top shape

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Key 1 Pump SelectionThe most critical step for
long pump life

• Right Type for the Application
• Sump / Effluent
• Little or no small solids
• Sewage Ejectors
• Varying solids passing capabilities
• Specialty (Grinders, etc.)
• Right Size for the Conditions
• Size pumps based on curve, not horsepower
• A bigger pump isnt necessarily a better pump!

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Pump Sizing in Three Slides!

• Establish the Flowrate (GPM)
• Most septic (enhanced flow) systems 30gpm
• too little inadequate scouring velocity
• too much potential flooding or erosion
• LPP or Drip applications Consult designer
• Establish the Head Required (TDH)

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Elements of Total Dynamic Head

• Static Head Actual elevation change
• Friction Head Loss due to frictional resistance
  between water and pipe
• Operating Head Pressure required in some
  systems (LPP, Pressure Dist., etc.)

Static Head Friction Head Operating Head
Total Dynamic Head (TDH)
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Size Based On Pump Curve
Pump Curves are easily accessible for any pump on
the market.
Find where the calculated TDH and the desired
flow intersect on the graph. Select a curve
which crosses close to but above this point.
Always try to stay toward the middle of the
curve, as this is where the pump is most
efficient.
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Key 2 Pump Installation

• Installing the right components, in the right
  places, the right way matters.
• Important components to consider

• Weep Holes
• Necessary for priming
• Prevent dead-heading
• Locate below check valve
• Check valves
• Guard against impeller backspin
• Prevent short cycling

• Correct Float Settings
• Ensure clearance between float and basin wall
• Adequate distance or tether prevents short
  cycling
• Elevation
• Raise a pump off the floor to avoid grit

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Watertightness

• Keep water in where you want it
• and out of where you dont.

• Water and Electricity dont
• play nice!
• _________________________
• Junction boxes are notorious for failing to seal
  out moisture.
• If cord ends are exposed to wetness, they will
  wick water into the pump housing. The result is
  pump failure.

• Basin lids and risers must be sealed to not leak.
• _______________________
• Leaky containers force a pump to do more work
  than necessary and drainfields to bear additional
  load.
• Infiltration brings unnecessary grit and dirt
  into a system.

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Controls Without Panel
Tether Length 6-18 inches

• Wide angle pump switch receives full current and
  voltage.
• Tether length determines pump range.

Pumping Range
Wide Angle
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Controls With Panel

• Narrow angle control switch receives reduced
  voltage and current.
• Used in pairs to determine pump range.

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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
PUMP 1
PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
PUMP 1
PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
RUN PUMP 1
PUMP 2
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Duplex
LAG/ALARM
START
STOP
Zoeller
RUN PUMP 1
PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
PUMP 1
PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
PUMP 1
PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
RUN PUMP 2
PUMP 1
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
RUN PUMP 2
PUMP 1
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
PUMP 1
PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
PUMP 1
PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
RUN PUMP 1
PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
RUN PUMP 1
RUN PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
RUN PUMP 1
RUN PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
RUN PUMP 1
RUN PUMP 2
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Duplex
LAG/ALARM
3 Float Operation
START
STOP
Zoeller
PUMP 1
PUMP 2
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Duplex
ALARM
4 Float Operation
LAG
START
STOP
Zoeller
PUMP 1
PUMP 2
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Very Good Installation!
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Very, Very Bad Installation!!
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Yet Another Bad Installation.
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Key 3 Pump Maintenance
Pump maintenance and system maintenance are one
and the same. One will always affect the other.

• On average, a wastewater pump system should be
  inspected once every 6 months.
• Develop a maintenance plan or routine.
• Instruct the owner of what to do (who to call) in
  the event of a problem.

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Six Month Maintenance

• Listen to pump
• Detect abnormal or irregular noises
• Scraping, buzzing, rattling
• Clear obstructions from pump inlet
• Ensure the weep hole is not blocked
• Inspect check valve
• Open j-box for wetness
• Check floats for clearance
• Open control panel
• Detect strange sewer or burnt odors
• Check time meters and counters

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Annual Maintenance

• Clean pump

• Inspect impeller for wear

• Inspect impeller cavity for buildup

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Two Year Maintenance

• Check oil in the motor cavity
• Note the following symptoms
• Burnt appearance or smell
• Pump has overheated Check motor resistance
• Milky look to the oil
• Shaft seal has failed Refill cavity with new
  appropriate replacement oil and check motor
  resistance
• Oil is clear and clean
• No problems Replace and secure oil plugs

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Major Service

• Problems listed below require attention from an
  authorized service station
• Inspection or poor performance reveals
  excessively worn impeller
• Poor performance and resistance testing indicates
  bad stator
• Sensors reveal a seal failure around the shaft
• Noisy operation reveals a bearing failure

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Effluent Turbine Pumps

• Turbine pumps are designed and built very
  differently than centrifugals.

• These pumps have no solids handling capabilities.
• Units consist of a motor end and an impeller end.
• Replacement ends, motor or impeller, are
  typically available and simple to change out.

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Troubleshooting

• Operational inspection checks
• Pump does not operate open circuit, take to
  service station
• Circuit breaker open short circuit, pump likely
  has water in cap or has badly overheated
• Pump motor hums debris in pump housing
  restricting impeller
• Pump runs constantly air locked or closed
  valve.
• Pump short cycles broken (or missing) check
  valve or float setup is incorrect

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Troubleshooting

• Common system problems
• Floats set incorrectly
• Vent hole clogged or weep hole not drilled
• Extension cord being used
• Undersized pit is too small for application
• Low voltage
• Running backwards or incorrect wiring on 3 phase
  units

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Troubleshooting

• Common system problems
• Total dynamic head below 5 ft or approaching
  shutoff
• High temperature liquid being pumped
• Continuous operation
• Incorrect wiring between pump controls

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Safety

• Always remember
• Dealing with pumps, potentially contaminated
  water, and electricity is dangerous.
• The primary goal of every day is not to make a
  buck, but to make it home healthy and in one
  piece!

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• Thank You for Your Attention