Water Flow Recommendations - BV Thermal Systems

Water Flow Recommendations

Water - Delivery Flow Velocity

Steel Pipes & Maximum Water Flow Capacity

Maximum Flow Velocities in Water Systems

Cooling Water Pipe Lines - Main Pipes & Lateral Pipes

Water Flow based on Pipe Size and Inside/Outside Diameters

PolyeEthylene Pipes, Flow and Pressure Loss ( 1/2�� - 6��)

? 209-522-3701

Water �\ Delivery Flow Velocity

Normal Pipe Size

Inch

1

2

3

4

6

8

10

12

mm

25

50

75

100

150

200

250

300

Water Delivery Velocity

ft/s

m/s

3.5

1

3.6

1.1

3.8

1.15

4

1.25

4.7

1.5

5.5

1.75

6.5

2

8.5

2.65

Steel Pipes & Maximum Water Flow Capacity

Pipe Size

(in)

2

2 1/2

3

4

6

8

10

12

14

16

18

20

24

Maximum Flow

(gal.min)

45

75

130

250

800

1600

3000

4700

6000

8000

10000

12000

18000

Velocity (ft/s)

4.3

5.0

5.6

6.6

8.9

10.3

12.2

13.4

14.2

14.5

14.3

13.8

14.4

Head Loss

(ft H20/100ft, m/100m)

3.9

4.1

3.9

4.0

4.0

3.8

4.0

4.0

4.0

3.5

3.0

2.4

2.1

Maximum Flow Velocities in Water Systems

Application

Tap Water (low noise)

Tap Water

Cooling Water

Suction boiler feed water

Discharge boiler feed water

Condensate

Heating circulation



Maximum Velocity

m/s

ft/s

0.5 �\ 0.7

1.6 �\ 2.3

1.0 �\ 2.5

3.3 �\ 8.2

1.5 �\ 2.5

4.9 �\ 8.2

0.5 �\ 1.0

1.6 �\ 3.3

1.5 �\ 2.5

4.9 �\ 8.2

1.0 �\ 2.0

3.3 �\ 6.5

1.3 �\ 3.0

3.3 �\ 9.8

209�\522�\3701

Cooling Water Pipe Lines

Main Pipes

Maximum allowable flow, velocity and pressure drop

Pipe Size

Flow

Velocity

Pressure Drop

(in)

(US gpm)

(liter/s)

(ft/s)

(m/s)

4

140

9

3.5

1.1

6

380

24

4.2

1.3

(ft H2O /100

(Pa/100 m)

feet)

2.2

21827

1.9

18877

8

650

41

4.2

1.3

1.4

13371

10

1100

69

4.2

1.3

1.2

11700

12

1800

114

4.5

1.4

1.2

12093

14

2200

139

5.1

1.6

1.1

11208

16

3300

208

5.9

1.8

1.2

11405

18

4500

284

6.2

1.9

1.2

11503

20

6000

379

6.7

2.0

1.2

11503

24

11000

694

7.8

2.4

1.2

11700

30

19000

1199

8.7

2.6

1.1

10913

3

70

4

3

0.9

2.3

22712

Cooling Water Pipe Lines

Lateral Pipes

Maximum allowable flow, velocity and pressure drop

Pipe Size

Flow

Velocity

Pressure Drop

(ft H2O /100

(Pa/100 m)

feet)

4.3

42179

(in)

(US gpm)

(liter/s)

(ft/s)

(m/s)

4

200

13

5.1

1.5

6

500

32

5.6

1.7

3.2

31364

8

900

57

5.8

1.8

2.5

24383

10

1500

95

6.1

1.9

2.1

20745

12

2400

151

6.8

2.1

2.1

20647

14

3100

196

7.2

2.2

2.1

20647

16

4500

284

7.9

2.4

2.1

20549

18

6000

379

8.3

2.5

2

19565

3

100

6

4.3

1.3

4.5

43949



209�\522�\3701

Water Flow (GPM/GPH) based on Pipe Size and Inside/Outside Diameters

Pipe Size

(Sch. 40)

1/2"

3/4"

1"

1�\1/4"

1�\1/2"

2"

2�\1/2"

3"

4"

5"

6"

8"

I.D. (range)

O.D.

Assume Gravity to Low

Pressure. About 6 f/s

flow velocity, also

suction side of pump

Assume Average

Pressure

(20-100PSI). About 12

f/s flow velocity

GPM

(w/ min.

PSI loss &

noise)

GPH

(w/ min.

PSI loss &

noise)

GPM

(w/ min.

PSI loss &

noise)

Assume "High Pressure" PEAK

flow. About 18 f/s flow

velocity

GPH

(w/ min.

PSI loss &

noise)

GPM

(w/ min. PSI

loss & noise)

GPH

(w/ min. PSI

loss & noise)

0.5 - 0.6"

0.85"

7

420

14

840

21

1,260

0.75 - 0.85"

1.06"

11

660

23

1,410

36

2,160

1 - 1.03"

1.33"

16

960

37

2,200

58

3,480

1.25 - 1.36"

1.67"

25

1,500

62

3,750

100

6,000

1.5 - 1.6"

1.9"

35

2,100

81

4,830

126

7,560

1.95 - 2.05"

2.38"

55

3,300

127

7,650

200

12,00

2.35 - 2.45"

2.89"

80

4,800

190

11,400

300

18,000

2.9 - 3.05"

3.5"

140

8,400

273

16,350

425

25,500

3.85 - 3.95"

4.5"

240

14,400

480

28,800

700

42,000

4.95" - 5.05"

5.563"

380

22,800

750

45,000

1,100

66,000

5.85 - 5.95"

6.61"

550

33,000

1100

66,000

1700

102,000

7.96"

8.625"

950

57,000

1900

114,000

2800

168,000



209�\522�\3701

PolyEthylene Pipes, Flow and Pressure Loss

Nominal Pipe Size: 1/2"

Flow

Velocity

Pressure Drop

(ftH 2 O/100

(mmH 2 O/1

(psi/100ft)

00m)

ft)

(m 3 /s)

(liter/s)

(US gpm)

(m/s)

(ft/s)

(Pa/100m)

3.00E-05

0.03

0.48

0.153

0.5

3550

4.00E-05

0.04

0.63

0.2

0.67

5785

590

0.26

0.59

5.00E-05

0.05

0.79

0.26

0.84

8629

880

0.38

0.88

6.00E-05

0.06

0.95

0.31

1

11834

1207

0.52

1.21

7.00E-05

0.07

1.11

0.36

1.17

15302

1560

0.68

1.56

8.00E-05

0.08

1.27

0.41

1.34

19460

1984

0.86

1.99

9.00E-05

0.09

1.43

0.46

1.51

23298

2376

1.03

2.4

1.00E-04

0.1

1.59

0.51

1.67

28763

2933

1.27

2.9

1.10E-04

0.11

1.74

0.56

1.84

33809

3447

1.49

3.5

1.20E-04

0.12

1.9

0.61

2

39052

3982

1.73

4

1.30E-04

0.13

2.1

0.66

2.2

44443

4532

1.96

4.5

1.40E-04

0.14

2.2

0.71

2.3

51543

5256

2.3

5.3

1.50E-04

0.15

2.4

0.77

2.5

57321

5845

2.5

5.9

1.60E-04

0.16

2.5

0.82

2.7

65218

6650

2.9

6.7

1.70E-04

0.17

2.7

0.87

2.8

71250

7265

3.1

7.3

1.80E-04

0.18

2.9

0.92

3

79879

8145

3.5

8.2

1.90E-04

0.19

3

0.97

3.2

89001

9075

3.9

9.1

2.00E-04

0.2

3.2

1.02

3.3

95329

9721

4.2

9.7

3.00E-04

0.3

4.8

1.53

5

199697

20363

8.8

20



362

0.157

0.36

209�\522�\3701

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