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HIGH DENSITY POLYETHYLENE & POLYPROPYLENE PIPING SYSTEMS

POLYPROPYLENE PIPING

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STANDARD DIN 8077

Expansion of PPH Pipe & Pressure Drop Calculations—Design Parameters

Length changes in plastic pipelines are commonly caused by thermal expansion due to changes in ambient temperature and changes in the temperature of the media being handled. The length change for polypropylene will be 0.0000837 inches per inch of length per degree Fahrenheit temperature change. So if the temperature of a 100 foot straight length of pipe is raised from 30°F (-1°C) to 80°F (27°C) it would grow by 5 inches. The pipeline must be installed in such a way that this expansion can accounted for. Common practice is to use either expansion loops or change of direction to achieve this. In both of these cases, a length of pipe running perpendicular to the change in length is used to absorb the expansion by being bent.

 

Pressure drop calculations are used to ensure correct pipe and pump sizing. By summation of pressure drop figures through each length of pipe, fitting and valve, a total value for the system can be found. This value can be used to help in pump selections. If the value is too high for the available pumps, then use of larger diameter pipe, fittings and valves should be recommended to decrease the allowed pressure drop for the chosen flow rate. Correct support is also necessary to prevent sagging and damage to the pipe. The distance between the pipe brackets depends upon the pipe diameter and the specific gravity of the media as well as the maximum working and ambient temperatures. If the media to be handled is hot, then it is often advantageous to provide

continuous horizontal support by laying the pipe within V or U shaped channels, made of metal or a heat resistant plastic. Pipe clamps should preferably be made of plastic, and should allow longitudinal movement of the pipe. Pipe clamps that clamp tightly onto the outside of the pipe do not allow proper expansion and may cause damage to the pipe

 

 

COLOR RAL 7032 PEBBLE GREY

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BETTER PIPING SOLUTIONS

SINCE 1971

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Size

Wall Series

Size

DN

NOMINAL PRESSURES

DN

 

PN 2.5

PN 4

PN 6

PN 10

PN 16

 

de mm

e mm

dl mm

e mm

dl mm

e mm

dl mm

e mm

dl mm

e mm

dl mm

de mm

20

de = OUTSIDE DIAMETER OF PIPE

1.8

16.4

1.9

16.2

2.8

14.4

20

25

dl = INSIDE DIAMETER OF PIPE

1.8

21.4

2.3

20.4

3.5

18

25

32

e = WALL THICKNESS OF PIPE

1.9

28.2

3.0

26

4.5

23

32

40

 

 

 

 

2.3

35.4

3.7

32.6

5.6

28.8

40

50

1.8

46.4

2.0

42.4

2.9

36.6

4.6

37.2

6.9

36.2

50

63

1.8

59.4

2.5

54.4

3.6

47.2

5.8

47.8

8.7

45.6

63

75

1.9

71.2

2.9

65.4

4.3

56.8

6.9

57.4

10.4

54.2

75

90

2.2

85.6

3.5

78.6

5.1

68.4

8.2

69.2

12.5

65

90

110

2.7

104.6

4.3

96

6.3

83.4

10.0

84.6

15.2

79.6

110

125

3.1

118.8

4.9

109

7.1

94.8

11.4

96

17.2

90.6

125

140

3.5

133

5.4

122.2

8.0

106.2

12.8

107.4

19.4

101.2

140

160

3.9

152.2

6.2

139.8

9.1

121.6

14.6

123

22.1

115.8

160

180

4.4

171.2

7.0

157.2

10.2

136.8

16.4

138.4

24.9

130.2

180

200

4.9

190.2

7.7

174.8

11.4

152

18.2

153.8

 

 

200

225

5.5

214

8.7

196.6

12.8

171

20.5

173

 

 

225

250

6.1

237.8

9.7

218.4

14.2

190

22.8

192.2

 

 

250

280

6.9

266.2

10.8

244.6

15.9

212.8

25.5

215.2

 

 

280

315

7.7

299.6

12.2

275.2

17.9

239.4

28.7

242.2

 

 

315