Centrifugal pumps often occur in the operation of a variety of faults for many reasons, the occurrence of different parts, mostly due to maintenance, installation of poor quality, or improper operation and maintenance caused.
The following is a variety of centrifugal pump failure phenomenon, causes of failure and treatment methods.
Symptoms | Cause of the malfunction | Approach |
| Pumping dissatisfaction | 1 , the end of the valve closed lax pipette leak 2 , the end of the valve is broken | 1 , overhaul bottom valve and pipette 2 , repair or replace the bottom valve |
| The pump is not aspirated, the vacuum gauge indicates a high degree of vacuum | 1 , the bottom valve is not open or filter part of the blockage 2 , pipette resistance is too large 3 , inhalation height is too high 4 , part of the liquid immersion depth is not enough | 1 , overhaul the end of the valve or cleaning filter part 2 , wash or replace the pipette 3 , appropriate to reduce the suction liquid height 4 , increase the immersion depth of the suction part |
| The pump is not aspirated, the vacuum and the gauge needle violently beat | 1 , before driving the pump fluid shortage 2 , suction system pipe or instrument leak 3 , the pipette is not immersed in the liquid or immersed in depth enough | 1 , stop the pump liquid filled 2 , check the pipette and instrumentation, and to eliminate leaks or block leaks 3 , lower the pipette, so immersed in the liquid to a certain depth |
| Although the pressure gauge pressure, but no liquid drain | 1 , drain resistance is too large 2 , tower operating pressure is too high 3 , impeller steering wrong 4 , Impeller flow blockage 5 , pump head is not enough 6 , drain pipe valve closed | 1 , cleaning the drain pipe or reduce the pipe elbow 2 , contact with the operator, adjust the tower pressure 3 , exchange the motor wiring 4 , cleaning the impeller 5 , replace the high-lift pump pump in series 6 , open the drain valve |
| Insufficient flow or no suction | 1 , seal ring radial gap increases, increased internal leakage 2 , impeller flow blockage, affecting circulation 3 , part of the suction resistance is too large, such as part of the filter blockage, elbow too much, the end of the valve is too small 4 , suction height is too large 5 , part of the liquid immersion concentration is not enough, there is air into 6 , suction part of the seal is not tight 7 , the pipette is not installed properly, so there is accumulation of air in the tube there 8 , drain resistance is too large, or not enough to open the outlet valve 9 , tower operating pressure is too high 10 , conveying liquid temperature is too high, the pump cavitation phenomenon, can not be continuous water 11 , pump flow is too small | 1 , repair seal ring 2 , cleaning impeller runner 3 , cleaning the filter to reduce the elbow and replace the bottom valve 4 , reduce the suction height 5 , increase the immersion depth of the suction part 6 , overhaul parts of the suction joints sealing, tighten the nut or replace the packing 7 , reinstall the pipette 8 , cleaning the pipe, or appropriate to open the outlet valve 9 , and operator contact, adjust the tower pressure 10 , appropriate to reduce the temperature of liquid transport, reducing the installation of the pump height, leaving allowed cavitation margin 11 , replace the large flow pump |
1 , the end of the valve closed lax pipette leak
2 , the end of the valve is broken
1 , overhaul bottom valve and pipette
2 , repair or replace the bottom valve
The pump is not aspirated, the vacuum gauge indicates a high degree of vacuum
1 , the bottom valve is not open or filter part of the blockage
2 , pipette resistance is too large
3 , inhalation height is too high
4 , part of the liquid immersion depth is not enough
1 , overhaul the end of the valve or cleaning filter part
2 , wash or replace the pipette
3 , appropriate to reduce the suction liquid height
4 , increase the immersion depth of the suction part
The pump is not aspirated, the vacuum and the gauge needle violently beat
1 , before driving the pump fluid shortage
2 , suction system pipe or instrument leak
3 , the pipette is not immersed in the liquid or immersed in depth enough
1 , stop the pump liquid filled
2 , check the pipette and instrumentation, and to eliminate leaks or block leaks
3 , lower the pipette, so immersed in the liquid to a certain depth
Although the pressure gauge pressure, but no liquid drain
1 , drain resistance is too large
2 , tower operating pressure is too high
3 , impeller steering wrong
4 , Impeller flow blockage
5 , pump head is not enough
6 , drain pipe valve closed
1 , cleaning the drain pipe or reduce the pipe elbow
2 , contact with the operator, adjust the tower pressure
3 , exchange the motor wiring
4 , cleaning the impeller
5 , replace the high-lift pump pump in series
6 , open the drain valve
Insufficient flow or no suction
1 , seal ring radial gap increases, increased internal leakage
2 , impeller flow blockage, affecting circulation
3 , part of the suction resistance is too large, such as part of the filter blockage, elbow too much, the end of the valve is too small
4 , suction height is too large
5 , part of the liquid immersion concentration is not enough, there is air into
6 , suction part of the seal is not tight
7 , the pipette is not installed properly, so there is accumulation of air in the tube there
8 , drain resistance is too large, or not enough to open the outlet valve
9 , tower operating pressure is too high
10 , conveying liquid temperature is too high, the pump cavitation phenomenon, can not be continuous water
11 , pump flow is too small
1 , repair seal ring
2 , cleaning impeller runner
3 , cleaning the filter to reduce the elbow and replace the bottom valve
4 , reduce the suction height
5 , increase the immersion depth of the suction part
6 , overhaul parts of the suction joints sealing, tighten the nut or replace the packing
7 , reinstall the pipette
8 , cleaning the pipe, or appropriate to open the outlet valve
9 , and operator contact, adjust the tower pressure
10 , appropriate to reduce the temperature of liquid transport, reducing the installation of the pump height, leaving allowed cavitation margin
11 , replace the large flow pump
Sand Casting, also known as sand molded casting, is a metal casting process characterized by using sand as Sand casting, The term "sand casting" can also refer to an object produced via the sand casting process. Sand castings are produced in specialized factories called foundries. Over 70% of all metal castings are produced via a sand casting process.
Sand casting is relatively cheap and sufficiently refractory even for steel foundry use. In addition to the sand, a suitable bonding agent (usually clay) is mixed or occurs with the sand. The mixture is moistened, typically with water, but sometimes with other substances, to develop strength and plasticity of the clay and to make the aggregate suitable for molding. The sand is typically contained in a system of frames or mold boxes known as a flask. The mold cavities and gate system are created by compacting the sand around models, or patterns, or carved directly into the sand.
Basic process
There are six steps in this process:
1.Place a pattern in sand to create a mold.
2.Incorporate the pattern and sand in a gating system.
3.Remove the pattern.
4.Fill the mold cavity with molten metal.
5.Allow the metal to cool.
6.Break away the sand mold and remove the casting.
Sand Casting
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