I had been appointed on a task to install a centrifugal pump long ago with my colleague Tabrez in one of the remotest areas of Tamil Nadu for an industrial project. We were a team of ten and we really had a blast of time there. The scorching heat of the sun wrenched the blood and water out of our body while the Centrifugal pump, which we were about to install in the location, delayed our tasks with every now and then issues. The every moment we fix it, the other moment is spirals out of track and shows horrendous symptoms that pulled the chords out of our brains. But I and Tabrez had to fix it all because we were heading for our appraisals next month.

We decided not to knock off with the challenges but outdo them. It was a rigorous time and finally the installation worked after 15 long wrenching days! I am now well educated with all the challenges that a centrifugal pump can throw on you at any point of time. This blog is dedicated to the major challenges that can come over from this particular machine.

Couple of things to remember while trouble shooting:

The actual centrifugal pumps motor usually work by pumping the difference between the suction and discharge heads. It pumps a combination of capacity and head.
These two numbers when multiplied together must show a constant result always. So, whenever the head increases, the capacity must reduce and vice versa.
Should the pump motor is not achieving the system curve requirements the issue may be inside pump motor, the suction part including the pipe and also source container, or maybe anywhere inside discharge pathways.

The problem could actually lie with the pump itself

1. The impeller diameter is way too small.
2. The impeller is operating at a lower speed.
3. There is something configurationally goofed up with all the electric motor. Examine these bearings and many others.
4. The impeller must have damaged due to constant exposure to wear and tear, erosion, corrosion or any other type of physical damage.
5. Shaft Displacement can be another major cause which can happen because of:

  • Operating the water pump too much beyond BEP.

  • Applications for pulley.

  • Pipe Strain.

  • Misalignment between driver and pump.

  • The shaft might have bent.

6. The rotating assembly had been not likely dynamically well balanced.
7. The particular impeller is actually back logged. That is a significant problem using sealed impellers.
8. The particular twice volute spreading is actually back logged using solids or perhaps solids include piled up in the top of spreading.
9. The particular start impeller to help volute clearance is actually too large. 0. 017″ (0, 5 mm) is actually normal. This too much clearance will result in inner recirculation troubles. An undesirable setting up, thermal increase, or perhaps standard impeller wear would be the cause.

These were few observation I and Tabrez noted while fixing our Centrifugal pump on the spot. However, there can be other prolonged issues as well.

We would like to know other issues too. If you have come across some, do share with us. This will help us design and manufacture more intelligent and robust Centrifugal Pumps.

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