Torque/Thrust calculation for Dampers/gates

[rajant2001]

Torque/Thrust calculation for Dampers/gates.
We want to calculate the Torque/Thrust required for opening/closing of the Damper/Gate.

The data available with us

1. area of the damper/gate in Sq.mm

2. Opeating pressure in mm water col. (g)

3. operating temperature in Deg. C

The damper is multi louver type used for reguating purpose and orientation is vertical.

The gate is sliding type used for isolation purpose and orientation is horizontal.

Kindly help me how to calculate torque/thrust required so that proper power cylinder can be selected.

 

[gerhardl]

Detailed construction information for the sidewise guides, form and material, and exact measures for the gate would be necessary. Only producers with experience would then be able then to give you an approximate idea of loosening torque.

On the other hand, if you are talking oil hydraulic cylinder and a 'smaller' size of gate, the cost of 'upsizing' and take an extra safety factor in consideration is not that high.

If this is a gate-size and type that also could be hand operated: try to find a similar size and construction and look at wheel diameter, stem size and thread. This will give you an approximative torque.

 

[roydm]

Provided the louvers are balanced the torque shouldn't be too high.
You don't say if the gate is to operate under flowing conditions or if it only operates when the system is down, that may have a considerable effect on the friction. I go with Gerhardl, if you oversize, you can always back of on the flow or pressure, however if you undersize there's not much you can do.
If you want a formula, you may be able to get one from the actuator vendors.
I suggest you write a spec describing the dampers and see how they respond.
Roy