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Published byErnesto Hensley Modified about 1 year ago

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PUMPING SYSTEMS BASICS

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Waste Water Pump Types Effluent and De-watering (Sump pump)Sewage Pump (2” solids) Non-Clog (2 ½” solids) Grinder Pump

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AUTOMATIC PUMPS Mechanical SwitchTethered Ball Float SwitchDiaphragm Switch NON-AUTOMATIC PUMPS

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Wide Angle Switches PIGGY BACK FLOAT SWITCH DOUBLE PIGGY BACK SWITCH

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Control Switch

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SIMPLEX SYSTEM Simplex Control Panel

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DUPLEX SYSTEM Duplex Control Panel

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BASINS Polyethylene Basin Fiberglass Basin

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PUMP SIZING THREE BASIC QUESTIONS FOR SIZING: 1. HOW MUCH ( Demand) 2. HOW HIGH ( Static Head) 3. HOW FAR ( Friction Head)

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Calculating System Demand ( HOW MUCH) POPULATION METHOD: Formula: ((NP x 100 gal/day/person x 4 )/24hrs/day )/60 min/hr. = GPM NP = population served. Number 4 is the peak flow factor Examples: 80 people in a sub-division. ((80 x 100 x 4)/24)/60 = 23 GPM.

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FIXTURE COUNT METHOD: Each fixture in a building is given a “ unit weight”. The total “unit weight” of all the fixture in the building is referenced on a conversion graph and a gallons per minute flow is determined. Calculating System Demand

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Static Head ( How High) Static Head Pump Discharge Line Discharge Point Static Head = Elevation Change

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Friction Head ( HOW FAR) Pump Discharge Line Discharge Point Friction head is determined by adding the total length of the discharge line (including fittings) then referencing a friction loss chart. Using the system demand flow and the size of the discharge pipe, the total head loss can be found. TOTAL DYNAMIC HEAD = Static Head + Friction Head

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Discharge Pipe Selection MINIMUM FLOW VELOCITY: In order to keep solids flowing in a horizontal pipe, a velocity of 2 ft. / sec. must be maintained. Suspended Solids Flow rates required to maintain 2 ft./sec: 2” pipe = 21 gpm3” pipe = 46 gpm4” pipe = 80 gpm 2 ft./sec flow Pipe

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Discharge Volume Exchange Discharge Line Sewer Main Pump To Find volume in Discharge line: Length of discharge ( ft.) X gal/ft. = Gal in Line Liquid Volume in Pipe: 2” =.17 gal/ft. 3” =.36 gal/ft. 4” =.65 gal/ft.

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Pump and System Curves System Curve Combined Pump and System Curves

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Basin Sizing & Selection 1. Physical Dimensions : Will it Fit ?

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Discharge Volume Exchange Discharge Line Sewer Main Pump To Find volume in Discharge line: Length of discharge ( ft.) X gal/ft. = Gal in Line Liquid Volume in Pipe: 2” =.17 gal/ft. 3” =.36 gal/ft. 4” =.65 gal/ft. There should be enough draw-down to change the volume in the discharge line every cycle. Pump on Pump off Draw down Basin

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Discharge Volume Exchange Discharge Line Sewer Main Pump To Find volume in Discharge line: Length of discharge ( ft.) X gal/ft. = Gal in Line Liquid Volume in Pipe: 2” =.17 gal/ft. 3” =.36 gal/ft. 4” =.65 gal/ft. There should be enough draw-down to change the volume in the discharge line every cycle. Pump on Pump off Draw down Basin

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Basin Sizing Calculations EXAMPLE: Commercial building with 50 gpm flow rate. Pump selected has a flow rate of 60 gpm. The pump height is 18” and the invert is 8”. The discharge line is 3” in diameter and 150 ft long. Step 1. Invert Distance - 8” Step 2. Pump Height - 18” Step 3. Draw down ( largest of the following ) a. Max starts – (( 50 gpm x 60 min )/ 6) x.4 = 200 gal/cycle 200 gal / 4.4 gal per inch = 45” b. Volume in discharge -.36 gal / ft x 150ft = 54 gal 54 gal / 4.4 gal per inch = 12” c. Pump run time : (60 gpm x 1 Min) / 4.4 gal per inch= 14 The total of all three critical dimensions is 71” The closest basin depth is 72”. Thus the suggested basin is 36 x 72. If this depth is too great for the application, then a wider basin can be used. This would result in a shallower basin.

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Calculating Depth 36” diameter basin: Pump Floor level Inlet pipe 8” 18” 45” (Draw down) Note: This would result in a complete change of volume and a run time of 3.5min Invert

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Residential Reality The preceding examples work well for commercial applications and for those residential applications serving the whole house. The reality is that most residential sewage applications serve just one, seldom used bathroom. In these applications the usage is so small that the pump protecting guidelines do not have the same importance. In these applications, a 2” solids pump and an 18 x 30 poly basin work very well.

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Related Topics VENTS AND AIR ADMITTANCE VALVES Water level Potential confined air Vent to atmosphere Studor AAV Liquid Inflow Incoming liquid displaces air, which is released through the vent. AAV’s prevent this release, causing the system to “air lock”.

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Questions For Additional Information: Chris Beiswenger (317)

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