Bypass Pumping Considerations Sewer System Rehabilitation – … · 2019. 10. 18. · Best to...

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New Jersey Water Environment Association Technology Transfer Seminar October 9 2019

Bypass Pumping ConsiderationsSewer System Rehabilitation – Trenchless Technologies John Corkery

Municipal Sales Manager

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Bypass Pumping Considerations

o Size and Flow Considerationso Equipment Selection Guidelineso Equipment Types/Applicationso Pumping Equipment – Accessorieso Case Study

Outline

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o Remember - Safety is always Job 1o Safety Rules You Can Live Witho Learn who to prevent:o Property Damageo Injury o Death


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• Rebuilding sewage infrastructure systems is a growing concern many municipalities -aging equipment

• Rehabilitation is often required to repair sewage lines

• Communities rely on trash-handling pumps to bypass sewage during line repairs

• Pumps and pumping systems have a critical role in assuring sewage continues to flow while necessary upgrades are made to the existing infrastructure


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Work Area

Upstream Manhole Downstream Manhole

What is Bypass Pumping – Trenchless Technology

FLOW

Temporary Plugs

Bypass Pumps

Temporary Bypass Pipes


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Find out the size of the sewer line that must be bypassed. Once the size is determined, it is used calculate the maximum flow the line can hold.

This also aids in selecting the correct mechanical plug to temporarily block the line so the corresponding section of the line can be repaired


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Determine the flow Max and Min

The location of the project determines the amount of flow to bypass the sewage line repair - Industrial or Commercial area - non-peak times - lines will receive lower flow levels.

Over sizing the pump(s) can lead to other problems

The pumps should not be repeatedly cycling for short bursts of activityBest to combine pumps to cover both the peak and low flow periods.

Accommodate added flow that might be brought on by a storm event


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EQUIPMENT SELECTION Estimating Flows

Sewage flow pattern for a typical municipality

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Estimating flows in gravity sewer systems


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ROUGH ESTIMATES (gpm) OF GRAVITY FLOWS IN TYPICAL-SIZED RCP PIPES WITHOUT SURCHARGE, FULL & P

RCP PIPE DIAMETER Normal Minimum Slope Encountered = 0.50% = 0.0050 ft/ftd/D=1/8 d/D=1/4 d/D=3/8 d/D=Half d/D=5/8 d/D=3/4 d/D=7/8 d/D=Full(Q=5%) (Q=15%) (Q=30%) (Q=50%) (Q=75%) (Q=91%) (Q=108%) (Q=100%)

12" 50 150 300 550 850 1,000 1,200 1,100

15" 110 320 650 1,050 1,600 1,900 2,300 2,100

18" 170 500 1,000 1,650 2,500 3,000 3,600 3,300


24" 230 700 1,400 2,300 3,500 4,200 5,000 4,600

30" 420 1,250 2,500 4,150 6,200 7,600 9,000 8,300

36" 670 2,000 4,000 6,700 10,000 12,200 14,500 13,400


42" 720 2,150 4,300 7,150 10,700 13,000 15,500 14,300

48" 1,020 3,050 6,100 10,200 15,300 18,600 22,000 20,400

60" 1,850 5,500 11,000 18,500 27,800 33,700 40,000 37,000

72" 3,000 9,000 18,000 30,000 45,000 54,600 65,000 60,000


Sheet1

ROUGH ESTIMATES (gpm) OF GRAVITY FLOWS IN TYPICAL-SIZED RCP PIPES WITHOUT SURCHARGE, FULL & PARTIALLY-FULL FLOW CONDITIONS

RCP PIPE DIAMETERNormal Minimum Slope Encountered = 0.50% = 0.0050 ft/ftMore Typical Slope Encountered = 1.00% = 0.0100 ft/ft

d/D=1/8d/D=1/4d/D=3/8d/D=Halfd/D=5/8d/D=3/4d/D=7/8d/D=Fulld/D=1/8d/D=1/4d/D=3/8d/D=Halfd/D=5/8d/D=3/4d/D=7/8d/D=Full

(Q=5%)(Q=15%)(Q=30%)(Q=50%)(Q=75%)(Q=91%)(Q=108%)(Q=100%)(Q=5%)(Q=15%)(Q=30%)(Q=50%)(Q=75%)(Q=91%)(Q=108%)(Q=100%)

12"501503005508501,0001,2001,100802505008001,2001,5001,7001,600

15"1103206501,0501,6001,9002,3002,1001404208501,4502,2002,6003,2002,900

18"1705001,0001,6502,5003,0003,6003,3002307001,4002,3503,5004,3005,1004,700




24"2307001,4002,3003,5004,2005,0004,6003209501,9003,2004,8005,8007,0006,400

30"4201,2502,5004,1506,2007,6009,0008,3005801,7503,5005,8008,70010,50012,60011,600

36"6702,0004,0006,70010,00012,20014,50013,4009402,8205,6509,45014,20017,20020,50018,900

RCP PIPE DIAMETERNormal Minimum Slope Encountered = 0.10% = 0.0010 ft/ftMore Typical Slope Encountered =0.25% = 0.0025 ft/ft



42"7202,1504,3007,15010,70013,00015,50014,3001,1303,4006,80011,30017,00020,50024,50022,600

48"1,0203,0506,10010,20015,30018,60022,00020,4002,4204,8509,70016,15024,20029,40035,00032,300

60"1,8505,50011,00018,50027,80033,70040,00037,0004,3908,75017,55029,25043,90053,20063,50058,500

72"3,0009,00018,00030,00045,00054,60065,00060,0007,13014,25028,50047,50071,30086,500103,00095,000

Notes:

1. Calculations based on Manning's Formula for Pipe Flow, using Manning's value for RCP pipe of n=0.013

2. Gravity flow is assumed; this table is NOT reliable if pipe flow is surcharged upstream.

3. Table is only valid for the slope values indicated.

4."Normal Minimum Slope Encountered" is an experience-based low slope often used for practical & economical reasons (lower slopes are possible).

5."More Typical Slope Encountered" is an experience-based average slope dictated by area topography (higher slopes are possible).

6. Values of Flow Q (in gpm) vary with depth of flow (d/D) as shown - Flow Q is maximized for non-surcharged situations to 108% of full pipe-flow when depth of flow is d/D = 7/8 approximately.

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Sheet3

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EQUIPMENT SELECTION Estimating FlowsMore Typical Slope Encountered = 1.00% = 0.0100 ft/ftd/D=1/8 d/D=1/4 d/D=3/8 d/D=Half d/D=5/8 d/D=3/4 d/D=7/8 d/D=Full(Q=5%) (Q=15%) (Q=30%) (Q=50%) (Q=75%) (Q=91%) (Q=108%) (Q=100%)

12" 80 250 500 800 1,200 1,500 1,700 1,600

15" 140 420 850 1,450 2,200 2,600 3,200 2,900

18" 230 700 1,400 2,350 3,500 4,300 5,100 4,700

More Typical Slope Encountered = 0.40% = 0.0040 ft/ftd/D=1/8 d/D=1/4 d/D=3/8 d/D=Half d/D=5/8 d/D=3/4 d/D=7/8 d/D=Full(Q=5%) (Q=15%) (Q=30%) (Q=50%) (Q=75%) (Q=91%) (Q=108%) (Q=100%)

24" 320 950 1,900 3,200 4,800 5,800 7,000 6,400

30" 580 1,750 3,500 5,800 8,700 10,500 12,600 11,600

36" 940 2,820 5,650 9,450 14,200 17,200 20,500 18,900

More Typical Slope Encountered =0.25% = 0.0025 ft/ftd/D=1/8 d/D=1/4 d/D=3/8 d/D=Half d/D=5/8 d/D=3/4 d/D=7/8 d/D=Full(Q=5%) (Q=15%) (Q=30%) (Q=50%) (Q=75%) (Q=91%) (Q=108%) (Q=100%)

42" 1,130 3,400 6,800 11,300 17,000 20,500 24,500 22,600

48" 2,420 4,850 9,700 16,150 24,200 29,400 35,000 32,300

60" 4,390 8,750 17,550 29,250 43,900 53,200 63,500 58,500

72" 7,130 14,250 28,500 47,500 71,300 86,500 103,000 95,000

Sheet1

ROUGH ESTIMATES (gpm) OF DISCHARGE IN TYPICAL-SIZED RCP PIPES WITHOUT SURCHARGE, FULL & PARTIALLY-FULL FLOW CONDITIONSROUGH ESTIMATES (gpm) OF DISCHARGE IN TYPICAL-SIZED RCP PIPES WITHOUT SURCHARGE, FULL & PARTIALLY-FULL FLOW CONDITIONS

RCP PIPE DIAMETERNormal Minimum Slope Encountered = 0.50% = 0.0050 ft/ftRCP PIPE DIAMETERMore Typical Slope Encountered = 1.00% = 0.0100 ft/ft

d/D=1/8d/D=1/4d/D=3/8d/D=Halfd/D=5/8d/D=1/8d/D=1/4d/D=3/8d/D=Halfd/D=5/8d/D=3/4d/D=7/8d/D=Full

(Q=5%)(Q=15%)(Q=30%)(Q=50%)(Q=75%)(Q=5%)(Q=15%)(Q=30%)(Q=50%)(Q=75%)(Q=91%)(Q=108%)(Q=100%)

12"5015030055085012"802505008001,2001,5001,7001,600

15"1103206501,0501,60015"1404208501,4502,2002,6003,2002,900

18"1705001,0001,6502,5003,0003,6003,30018"2307001,4002,3503,5004,3005,1004,700




24"2307001,4002,3003,5004,2005,0004,60024"3209501,9003,2004,8005,8007,0006,400

30"4201,2502,5004,1506,2007,6009,0008,30030"5801,7503,5005,8008,70010,50012,60011,600

36"6702,0004,0006,70010,00012,20014,50013,40036"9402,8205,6509,45014,20017,20020,50018,900

RCP PIPE DIAMETERNormal Minimum Slope Encountered = 0.10% = 0.0010 ft/ftMore Typical Slope Encountered =0.25% = 0.0025 ft/ft



42"7202,1504,3007,15010,70013,00015,50014,30042"1,1303,4006,80011,30017,00020,50024,50022,600

48"1,0203,0506,10010,20015,30018,60022,00020,40048"2,4204,8509,70016,15024,20029,40035,00032,300

60"1,8505,50011,00018,50027,80033,70040,00037,00060"4,3908,75017,55029,25043,90053,20063,50058,500

72"3,0009,00018,00030,00045,00054,60065,00060,00072"7,13014,25028,50047,50071,30086,500103,00095,000

Notes:

1. Calculations based on Manning's Formula for Pipe Flow, using Manning's value for RCP pipe of n=0.013

2. Gravity flow is assumed; this table is NOT reliable if pipe flow is surcharged upstream.

3. Table is only valid for the slope values indicated.

4."Normal Minimum Slope Encountered" is an experience-based low slope often used for practical & economical reasons (lower slopes are possible).

5."More Typical Slope Encountered" is an experience-based average slope dictated by area topography (higher slopes are possible).

6. Values of Flow Q (in gpm) vary with depth of flow (d/D) as shown - Flow Q is maximized for non-surcharged situations to 108% of full pipe-flow when depth of flow is d/D = 7/8 approximately.

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Sheet3

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EQUIPMENT SELECTION

o Locationo Manhole/Chambero Suction Lifto Surface mounted automatic self-priming, solids handling

portable pumpo Submersible Electric Motor Pumpso Hydraulically Driven submersible pumps

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o Surcharge

o Variations in suction lift - level can get before impacting properties upstream

o Max suction lift – 20 ft

EQUIPMENT SELECTION

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o Suction conditions- where to position pumps

o Access

o Air elimination

o Suction Gauges

EQUIPMENT SELECTION

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Effect of Suction lift on Performance

Example:10 foot suction liftFlow 2150gpm

25 foot suction liftFlow 600 gpm

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o Discharge pressure – TDHo Manifoldo Gates and Checkso Discharge gaugeso Redundancy

EQUIPMENT SELECTION

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TYPES - EQUIPMENT

o Engine driven surface-mounted, automatic self-priming, solids handling portable pump

o Electric driven surface-mounted, automatic self-priming, solids handling portable pump

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TYPES - EQUIPMENT

o Electric Driven Submersible Pumps

o Hydraulic Driven Submersible Pumps

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TYPES - EQUIPMENT

Surface-mounted, automatic self-priming, solids handling portable pump

o 6-Inch Suction

o 6-Inch Discharge

o Discharge up to 2000GPM

o Heads up to 300ft

Priming Chamber

Compressor

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TYPES - EQUIPMENT


o 12-Inch Suction

o 12-Inch Discharge

o Discharge up to 5500GPM

o Heads up to 300ft

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TYPES - EQUIPMENT

Electric driven submersible pumps

o 4 to 24 -Inch discharge size

o Discharge flows up to 10 MGD

o Heads up to 350ft

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TYPES - EQUIPMENT

Hydraulic driven submersible pumps

o 4 to 6 -Inch discharge size

o Discharge flows up to 1800gpm

o Heads up to 80ft

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APPLICATIONS


o Self-powered

o Sound Attenuated

o Variable Speed

o Portable

o Reliable

o Accessible Maintenance

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APPLICATIONS

Submersible Electric Driven pump

o No suction issues

o VFD and complete AUTO Control

o Large sizes and capacities available

o Quiet

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APPLICATIONS

o Transportable version with pipe or hose connection

o Free Standingo Non Clog


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APPLICATIONS

o Transportable version with pipe or hose connection

o Free Standingo Non Clog


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ACCESSORIES Discharge Piping and Hoses

o HDPE Pipeo Victaulic Fittingso Bendso Teeso Air Release

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ACCESSORIES Discharge Piping and Hoses

o HDPE Pipeo Victaulic Fittingso Bendso Teeso Air Release

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ACCESSORIES

Discharge Piping and Hoses

o Hoseo Victaulic Fittingso Bendso Teeso Air Release

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ACCESSORIES



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ACCESSORIES



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ACCESSORIES

Temporary Power -Generators

o Sound Attenuatedo Day and auxiliary

fuel tankso Redundancyo Cablingo Portable

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ACCESSORIES

Temporary Control Systems

o Float Switcho Probeso Transducero Direct-on-lineo Variable Frequency

Driveso Start-up

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CASE STUDY

Application

Repair to a 24-inch gravity pipe at Pump Station.

ConstraintsBypass Manhole 31 ft DeepManhole SurchargeConcerns with Plug RemovalRags and Blockages(3) Month Duration

Submersible Self Priming Pumps

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To reduce suction liftsPumps has to be lowered into the ground.

CASE STUDY


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CASE STUDY


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CASE STUDY


SELF Priming System

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CASE STUDY


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Submittal details

CASE STUDY

The plan is to have two (2) 70 hp Flygt Submersible Pumps to meet a peak flow of 11 MGD (around 7640gpm). A third Flygt submersible Pump will be on hand to act as backup if required.

These pumps come standard with a submersible motor which should provide an additional level of protection against any possible flooding in the work area.


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CASE STUDY

Each of the above pumping units will come with its own Self Priming System Assembly. All three pumps will have individual suction piping with individual discharge piping out to a common manifold.

There will then be a common discharge pipe to handle the expected flow from two pumps running in parallel. In order to satisfy the Suction Lift constraints of the project as well as of the pumping units, the pumps will be located in the parking lot area at elevation 3.50 feet.


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Summary

o Importance of Flow Calculationo Wide Variety of Bypass pumps and

accessories availableo Safety

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Bypass Pumping ConsiderationsSewer System Rehabilitation – Trenchless Technologies

Questions

John Corkery 732 684 3025 [email protected]

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