Pulsation dampers mounting opinions

MOUNTING OPINIONS TO OBTEIN THE MAXIMUM DAMPENER EFFICIENCY

The pump who has  the higher relation “instant. maxi. Flow/ mean flow” is the one single piston pump, and also the type of pump where “dv” has a higher value ( liquid going into and out of dampener in each cycle). Therefore in the next example  we will expose this type of pump.
We can say that in 99% of industrial applications if the recommendations that we expose are followed the dampener’s  efficiency is guaranteed

 

1)  Mounting the dampener with its axle lined  with the outlet pump axle
 2) The distance between the pump outlet port and the dampener port connection must be as short as      possible.
 3) The pipe section from the pump to the dampener ought to be calculated for the maxi. pump Instantaneous flow.
 4)  The pipe section from the dampener to the circuit must be calculated according to the mean flow.   
 In the next drawing we will see more clearly all the concepts we have exposed so far.
 
 
 w = pipe section for the mean flow
 W=small length of pipe for the maxi. instantaneous  flow         
         Q = maxi. Instantaneous flow
         q = mean flow
         L = as short as possible distance between pump and dampener

 

To show the difference between the inline  and derivation connection to the circuit we will remember  one mechanical fluids concept
When a liquid is moving into a tube there are different  speed lines .In the centre of the tube the  speed is maxi. and near the internal tube wall the speed is nearly zero ( see next drawing)
If the liquid mean speed increases,  the difference is higher between the dynamical pressure,-the pressure measured in the liquid direction-and the static pressure- the pressure measured perpendicular to the liquid direction-.
We can see that the dampener inline mounting corresponds at the measure of the dynamic pressure, and the derivation mounting corresponds to the static pressure.

 

If the dampener is mounted in derivation, at a large distance from the pump and besides with a smaller diameter than the main circuit pipe, then, the efficiency of the dampener could be reduced a great deal.

 

<< Previous  -  Next >>