PUMPING SYSTEMSPUMPING SYSTEMS REGULATION

MIGUEL ÁNGEL MORENO HIDALGO

UNIVERSIDAD DE CASTILLA-LA MANCHA

ONLINE ADMINISTERED COURSE – 16 DECEMBER 2020

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PUMPING SYSTEM CONTROL

• When discharge or pressure are high usually associating several pumps in parallel or series is a better option than installing a large pump

• When installing several pumps it is necessary to regulate the activation of the different pumps

• Connecting in series for increasing pressure

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PUMPING SYSTEM CONTROL

1 pump 3 pumps in series

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PUMPING SYSTEM CONTROL

B1

B2

Q1

Q2

H1

H2

QT= Q1=Q2

HT=H1+H2

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PUMPING SYSTEM CONTROL

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PUMPING SYSTEM CONTROL

• When discharge or pressure are high usually associating several pumps in parallel or series is a better option than installing a large pump

• When installing several pumps it is necessary to regulate the activation of the different pumps

• Connecting in series for increasing pressure

• Connecting in parallel for increasing discharge

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PUMPING SYSTEM CONTROL

1 pump 3 pumps in parallel

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PUMPING SYSTEM CONTROL

B1 B2

Q1 Q2H1 H2

QT= Q1+Q2

H1=H2

If we associate 2 pumps in pararell they do not supplythe double of discharge!!

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PUMPING SYSTEM CONTROL

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• Regulation of pumping stations

• Manometric regulation, controlled by a pressure transducer

• Regulation following the system curve• Regulation following a calculated system curve. Controlled with a flowmeter

• Regulation following a dynamic system curve. Controlled with a flowmeter and several pressure transducers located in the irrigation network

PUMPING SYSTEM CONTROL

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PUMPING SYSTEM CONTROLManometric regulation

H=45 m

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=1094 l/min ( 5%)

INDAR 257-3

Q=1094 l/minH=45 mh=44.4%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=3054 l/min (13%)

INDAR 257-3

Q=3054 l/minH=45 mh=74.6%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=5085 l/min (21%)

INDAR 257-3

Q=5085 l/minH=45 mh=67.1%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=5952 l/min (25%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=7046 l/min (30%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=1094 l/minH=45 mh=44.4%

𝜂 =1094 · 44.4 + 5952 · 60.5

7046= 58%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=9006 l/min (38%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=3054 l/minH=45 mh=74.6%

𝜂 =3054 · 74,6 + 5952 · 60.5

9006= 65.3%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=11037 l/min (46%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5085 l/minH=45 mh=67.1%

𝜂 =5085 · 67.1 + 5952 · 60.5

11037= 77.9%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=11904 l/min (50%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

𝜂 = 60.5%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=12998 l/min (55%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

Q=1094 l/minH=45 mh=44.4%

𝜂 =1094 · 44.4 + 5952 · 60.5 · 2

12998= 59.1%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=14958 l/min (63%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

Q=3054 l/minH=45 mh=74.6%

𝜂 =3054 · 74,6 + 5952 · 60.5 · 2

14958= 63.4%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=16989 l/min (71%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

Q=5085 l/minH=45 mh=67.1%

𝜂 =5085 · 67.1 + 5952 · 60.5 · 2

16989= 62.47%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=17856 l/min (75%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

𝜂 = 60.5%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=18950 l/min (80%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

Q=1094 l/minH=45 mh=44.4%

Q=5952 l/minH=45 mh=60.5%

𝜂 =1094 · 44.4 + 5952 · 60.5 · 3

18950= 59.6%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=20910 l/min (88%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

Q=3054 l/minH=45 mh=74.6%

Q=5952 l/minH=45 mh=60.5%

𝜂 =3054 · 74,6 + 5952 · 60.5 · 3

20910= 62.6%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=22941 l/min (96%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

Q=5085 l/minH=45 mh=67.1%

Q=5952 l/minH=45 mh=60.5%

𝜂 =5085 · 67.1 + 5952 · 60.5 · 3

22941= 62%

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PUMPING SYSTEM CONTROL

Demanded dischargeQ=23808 l/min (100%)

INDAR 257-3

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

Q=5952 l/minH=45 mh=60.5%

𝜂 = 60.5%

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PUMPING SYSTEM CONTROL

Qdesign=Qmax= 23808 l/minEfficiency= 60.5%

Discharge distribution along theirrigation season?

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PUMPING SYSTEM CONTROL

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PUMPING SYSTEM CONTROL

𝜂 𝑎𝑣𝑒𝑟𝑎𝑔𝑒 =𝜂1 · 𝑄1 · 𝑓1+ 𝜂2 · 𝑄2 · 𝑓2+⋯+ 𝜂𝑛 · 𝑄𝑛 · 𝑓𝑛

𝑄1+ 𝑄2+⋯+ 𝑄𝑛

Q1 Q2

h1

h2

Qn

hn

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PUMPING SYSTEM CONTROL

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• Incorporate a smaller pump for improving efficiency for low discharges

• Incorporate a second variable speed pump

• Activate it sequentially

• Determine the head pressure necessary. Careful with working point !

PUMPING SYSTEM CONTROL

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• Incorporate several pumps in series or parallel, do not install very large pumps.

• Regulate it with frequency speed drives. Optimal regulation may require two of them activated sequentially

• The pump does not usually demand the maximum discharge. Design and manage your pumping station considering the frequency of each discharge

SUMMARY