agitator for tanks

[16548613513]

Dear all,
My question is about hydrolysis tanks with agitator.
What kind of function(sine,cosine etc..) do these loads affect?

Loads from agıtator:

Axial Force : 12320 N
Torque : 5840 Nm
Bending Momentt : 6650 Nm
Weight of Agitator : 1900 kgs
Stiffess for agitator flanfe : 10 times the lx-vale for drive shaft 718 cm^4
Net shaft Power : 9,5 kW

Thank you in advance.

 

[JStephen]

The few times I've dealt with mixers and agitators, the manufacturers gave an equivalent static load and maximum deflection, but no dynamic information at all. And the equivalent static load may have been higher than actual loading to account for dynamic effects.

 

[16548613513]

Mr. JStephen,
Do you mean that statical conditions are more critical?

Thanks

 

[MJCronin]

Oz....

What Mr. Stephen is trying to say is that when a static analysis is done with a agitator vendor supplied load, you have done "adequate engineering"

Yes, some very fine analytical tools exist for a detailed dynamic analysis. You can develop some fierce FEA models and analyze the structure at various speeds, various harmonics etc. etc. etc.

You can certainly devote months of engineering analysis time to each agitator.... make some beautiful reports.

But, the "quick and dirty" equivalent static analysis is what most engineering companies offer ....

My opinion only ...

MJCronin
Sr. Process Engineer

 

[JStephen]

What I'm saying is that the mixer/agitator people assume that their purchasers won't/can't do extensive dynamic analysis, so they furnish static loads and stiffness requirements, with the loads including increases over the actual static loads to account for potential dynamic effects.