API-620 Tank
API-620 Tank
(OP)
IN API-620 Tank, when do we use Cone Roof and when do we use Dome Roof? Whta is the advantage?
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RE: API-620 Tank
Steve Braune
Tank Industry Consultants
www.tankindustry.com
RE: API-620 Tank
RE: API-620 Tank
A cone roof is simpler to layout and to fabricate. It may involve slightly more weight, but is still usually lower cost. (For a pressurized tank, the additional weight is a good thing). It generally makes the layout of roof accessories easier. For low pressures and small sizes, a cone roof will be less steep than the edge of a dome roof.
A true dome roof requires plates to be pressed. So anyone quoting the tank who doesn't normally do press work is forced to buy the roof from outside sources. And the people that normally press plates are usually not very competitive in small-size tanks (much capability = much overhead.)
The roof could be built as an umbrella. I seem to recall that API has some conflicting interpretations about the acceptability of an umbrella for pressure use, though.
If you're the owner or a consultant specifying the design, I'd recommend that you leave the choice of roof shape to the contractors.
RE: API-620 Tank
Steve Braune
Tank Industry Consultants
www.tankindustry.com