6-2-Meyers-Pump Styles.pdf

8/20/2019 6-2-Meyers-Pump Styles.pdf

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Understanding the Differences Between

Dewatering Pumps,

Pump Styles

Sewage Pumps,

and Grinder Pumps.

Presented by: Darren Meyers, P.E.Zoeller Pump Company


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Why Do We Pump?

Pumping gives us options

• We’re not constrained by gravity.

• We can avoid greater costs.• Larger construction costs

• Larger pump costs

• We gain control!


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Wastewater Defined

• Sewage – Raw Wastewater (including solids) from toilettes &

drains

• Effluent – Wastewater (mostly liquid) which has passed through

a septic tank

• Groundwater (o.k.- so it’s not wastewater)

– Mostly clean, but may contain some silt


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Three Keys to

Trouble-Free Pump Operation

1. Proper Selection• Picking the right pump for the job

2. Correct Installation• Clean, safe, organized

3. Periodic Maintenance• Keeping a pump in top shape


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One Size Does NOT Fit All!

Pumps have been designed

according to specific needs.

Each style has aparticular application.

Choosing the correct pump style is as critical

as choosing the correct pump size.


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Most Common Pumps for

Wastewater Installers

• Sump / Effluent / Dewatering• Little or no solids

• Sewage Ejectors• Varying solids passing capabilities

• Grinders• Solids environment


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Dewatering / Effluent Pumps

Dewatering pumps are

designed to move liquidwhich is mostly solids free

• Groundwater

– Sump applications

• Effluent

– Onsite dosing applications


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Dewatering Pump Characteristics

• Little to no solids handling

capability• Sometimes none• Sometimes up to ¾”

• Typically smaller pipes (1” to2”)

• Higher head pressures• Lower flow rates


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Sump Pumps

• Intended for use in

groundwater removalapplications.

• Often contain an integralside switch.

• May be partially above

and below the waterline


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Effluent Pumps

• Intended to pump septic tank

effluent.

• Does not have any integral switch

• Must be kept below the waterline• Corrosive gasses build up in a septic

environment


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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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Sewage Pumps

a.k.a. – Sewage Ejector, Non-Clog

Sewage pumps are designed to

pump whole solids from a basinto some other location

• Gravity sewer

• Septic tank


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Sewage Pump Characteristics

• Designed to handle solids• 2” solids or greater

• Larger pipes (greater than 2”)• Lower head pressures

• Higher flow rates


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Centrifugal Grinders

• Curves are similar to large effluentpumps

• Use standard impellers to move the

sewage slurry after chopping it.

• Used most frequently in:

– Sites just downhill from a gravity sewer

– Problematic sites where sewage pumpsmay clog

• Prisons, nursing homes, schools, etc.


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Progressing Cavity Grinders

• Produce very high heads andrelatively small flows.

• Use a “corkscrew” type action to liftground-up sewage

• Use most frequently in: – Applications requiring very high

pressures – Pressure sewer networks

• High heads/low flows are ideal for networkswith large numbers of units.


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Pumping into a Septic Tank

• Sewage pumps are appropriate• Transfer whole solids

• Do not use grinders to pump into septic tanks.• Solids are ground too finely to settle out.


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Pump Sizing in Two Slides!

• Static Head – Actual elevation change

• Friction Head – Loss due to frictional resistancebetween water and pipe

• Operating Head – Pressure required in somesystems (LPP, Pressure Dist., etc.)

Static Head + Friction Head + Operating Head= Total Dynamic Head (TDH)


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Size Based On

Pump CurvePump Curves are easily accessible

for any pump on the market.

Find where the calculated TDH and

the desired flow intersect on thegraph. 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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Thank You for Your Attention

Documents

6-2-Meyers-Pump Styles.pdf