Slurry pump vibration

There are lots of factors will cause slurry pump vibration, when this happens the following tips maybe could help you to resume production quickly and also may improve the efficiency
1. Bad foundation
Check the adequacy of the slurry pump foundation
Vertical pumps or sump pumps steel structural base should be checked, if not solid, reinforce it or enhance strength of steel
The natural frequency of foundation whether cause resonance with pump running or not, if yes, adjust the pump speed
2. Bad installation
Anchor bolts should be tightened
Concentric must be check for direct coupling between slurry pump and motor or generator
If use sheaves drive, check whether the center of the pump and motor shaft is parallel
There should be a firmed support for slurry pipeline, do not let the pipe directly support by slurry pump
Make sure there is no heat distortion when conveying high temperature medium
3. Pump rotor part problems
Bad static and dynamic balance of slurry pump impeller
Pump belt sheave is imbalance
Bearing bracket problem
Bending shaft, then bending straightening required
Impeller blockage, resulting in uneven impeller, the impeller should be cleared
Bearing rusty or damaged, replace with new ones
4. Motor problems
Motor rotor balancing is not qualified
Motor with incorrect poles installed
Whether the motor sheave balance or not
5. Slurry pump selection and improper use
Effective pipeline pump NPSH must be less than the pump NPSH, or it will cause cavitation
Head is higher than slurry pipeline needed, large flow operation caused cavitation, then you have to reduce slurry pump speed or cut impeller
Small volume pool in suction line, air will get into the pump by large fluctuations of medium pool, better to enlarge the volume of the pool
There is still air in pipeline or not fulfill water injection

What is slurry pump gland packing seal

Slurry pump shaft seal has always been a headache problem, with the expansion of slurry pumps working range, it is even more pronounced. Because solids of slurry size is growing and much more harmful liquid. These corrosion and wear substances will shorten the shaft seal life, and may lead to leakage, then directly affect the normal operation of the slurry pump and even the personal safety of the operator. Bellow we will talk the most common shaft seal, Gland packing seal.

Gland packing main parts
Gland packing consists of neck rings, shaft sleeve, packing, gland, long buckle studs and nuts.

How Gland packing works
This kind of packing based on the packing contact with the shaft surface to prevent slurry leakage to achieve the purpose of sealing.
Between the packing and shaft there are many small gaps and grooves, so it can apply enough clamping force to achieve the necessary sealing pressure, packings can produce plastic deformation filler to reduce the gap.
Because there is always a certain shaft surface roughness, it is impossible to achieve the desired contact with the packing filler, there must be a slight gap exists, thus forming “Labyrinth”. Damping effect of these tiny gap on the media repeatedly twists the throttle and play, as well as stagnant boundary layer in the gap generated by such factors as “Labyrinth” effect, leading to a gap blocking to achieve seal. The sealing effect is blocked with a dielectric packing filler material into the contact surface between the shaft in the gap formed.

Three ways of leakage
One: Through the packing filler and the stationary element interface
Two: Through the packing itself
Three: Through packing and moving interface