Aluminum DAF Tank design

[nilaypathak]

In DAF process water treatment plant have three DAF tanks. We have found vibration during back wash when sludge hits trough and drain into pipe to back wash pond. Material us in the tank is aluminum.

Any suggestion to deal with this type of problem. Please find attached drawing.

Thanks, in advance.

 

[MikeHalloran]

The first thing that comes to mind is stiffening the 'adjustable weir plate's, i.e. by doubling their thickness or adding a short bent flange, or a hem.

Mike Halloran
Pembroke Pines, FL, USA

 

[chemebabak]

Nilaypathak,

Have you solved this problem? Has your plant always had this problem? My plant has similar issues and I would like some direction.

 

[ATSE]

3-D vibrational analysis is tricky.
What you are describing is sometimes termed by vibration engineers as "perturbations" that are associated with a very high stiffness in a single DOF along with low mass. This occurs in many different fields - most commonly wind engineering.
If you have the option, it would be interesting to bolt or clamp a temporary mass (thick steel or aluminum plate) to the vibrating component so the weight increases (say, triples), and observe the vibration during a sludge cycle.