Force to form double-curved plates

[JStephen]

We are investigating the feasibility of pressing dome roofs and knuckles for field-erected storage tanks. This would involve forming flat plate to a double-curved shape, requiring the stretching or compression of the plate itself. Is anyone aware of any standard methods or resources for determining the forces required for this? Are there any manufacturers that specialize in this kind of equipment?

Thanks,
Stephen

 

[spayette]

Stephen,

If I understand your need correctly, CBI would be one company that would have the capability of forming such plate sections since they have constructed many dome roof tanks, as well as spherical pressure storage vessels.

 

[JStephen]

I realize that there are a number of companies that routinely do this type of forming, and even companies that sell formed segmented roofs. But I am looking for information on the forming processes and equipment, not on suppliers of the finished product.

 

[JoeTank]

You may also wish to consider an umbrella roof in lieu of a dome roof. The umbrella roof is formed by rolling instead of pressing. Fabrication costs would be much lower.

Also, pressing thin plates into a spherical shape can be difficult, especially for the 3/16 and 1/4 thicknesses. They keep springing back to flat!

Steve Braune
Tank Industry Consultants

http://www.tankindustry.com