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EXPLANATION |
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PE100,ND
140,Din=123.4mm |
PVC,ND140in=126.6mm |
Steel&Cast-lron
,Din=123.4 |
|
a/g |
Pmax |
Pop |
Pmin |
a/g |
Pmax |
Pop |
Pmin |
a/g |
Pmax |
Pop |
Pmin |
V |
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M/S |
Sec. |
bar |
Bar |
bar |
Sec |
bar |
bar |
bar |
Sec. |
Bar |
bar |
bar |
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13,4 |
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38,7 |
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128,4 |
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1 |
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11,34 |
10,0 |
8,66 |
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13,88 |
10,0 |
6,12 |
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22,85 |
10,0 |
-2,85 |
2 |
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12,68 |
10,0 |
7,32 |
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17,75 |
10,0 |
2,25 |
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35,69 |
10,0 |
-15,7 |
3 |
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14,03 |
10,0 |
5,97 |
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21,63 |
10,0 |
-1,62 |
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48,54 |
10,0 |
-28,5 |
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(A) Velocity
of pressure wave in pipe depends on
EP&EW.
(g) Acceleration due to gravity.
for
Example:
At 10 bar and
3m/s water velocity,due to water impacts,there
is a 40% pressure increase on PE100
pipes,while on PVC 116%,steel&cast
iron pipe there is a 385%
pressure
increase.Taking into account water
impact:
pipes with low wall elasticity coefficient
either will be designed with higher
pressure than the operating pressure
,or if it is till a certain degree
pressure-resistant,it should be operated
at quite low operating pressure. |
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