Due to the characteristics of the WFGD project, it is decided to transport the slurry at a higher temperature, with bubbles and with a large amount of solid particles. Therefore, due to the evaporation of the slurry and the concurrent collapse of the bubble, it causes special vibrations and pressure fluctuations of gas condensation and evacuation, which will affect the safe operation of the pump. Need to take care of the following two aspects:
1. Gaseous clogging of the runner will cause a decrease in pump flow, lift and efficiency.
2. Bubble material rupture in the material caused by the loss (cavitation), to choose a strong anti-cavitation materials.
Here are some of the material's anti-cavitation properties. Material | Designation | Material No. | Index Weight loss |
Castiron | GG25 | 0.6025 | 1 |
Cast steel | GS-C25 | 1.0619 | 0.8 |
Cast chromium Steel | G-X20Cr14 | 1.4027 | 0.2 |
Cast CrNi steel | G-X6CrNi189 | 1.4308 | 0.05 |
NORIDUR | G-X3CrNiMoCu246 | 9.4460 | 0.02 |
Cavitation can cause the following problems 1. Reduce bearing life.
2. Cause damage to the impeller inlet area.
3. Damaged pump shaft.
4. Mechanical seal contact surface damage, causing leakage.
5. The noise rises, it seems, is conveying round hard particles.
Material
Designation
Material No.
Index Weight loss
Castiron
GG25
0.6025
1
Cast steel
GS-C25
1.0619
0.8
Cast chromium
Steel
G-X20Cr14
1.4027
0.2
Cast CrNi steel
G-X6CrNi189
1.4308
0.05
NORIDUR
G-X3CrNiMoCu246
9.4460
0.02
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