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Surge / Water Hammer
Ductile Iron Pipes
PN K9
| DN | maximum allowable working pressure |
|---|---|
| 80 - 200 | 40 |
| 250 - 350 | 32 |
| 400 - 800 | 25 |
| 900 - 1200 | 20 |
DN 400 PN K9 maximum pressure in use: 25 bar
wave speed DN 400 ductile iron 1139m/s
surge vessel: 30-50% filled with water
Pumps
specific speed = NR * sqrt(QR) / HR3/4
Wave Velocity In Ductile Iron Pipes
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