Verify load on roof - API 650 tank
Verify load on roof - API 650 tank
(OP)
I have a small API 650 tank (12' diam), with self-supporting cone roof (3/16") where I need to install an agitator in a roof center nozzle. The total weight is close to 1000 lbs so I need to check the loads and probably reinforce the roof accordingly.
Any suggestion about how could the roof be verified against this concentrated load?
Any suggestion about how could the roof be verified against this concentrated load?





RE: Verify load on roof - API 650 tank
You can check loads on a roof like that using the approach in API-620. But it won't account for bending in the plate, and won't let you check deflections, which could be an issue (IE, vibrations). The beam approach at least allows you to do a proper design more easily.
RE: Verify load on roof - API 650 tank
Remove the cone roof, install a flat roof with integral beams ( I suggest 10" minimum depth)for agitator support. Relocate vents nozzles etc as necessary.
Size the beams for the bending, deadload and torsionalloads imposed by the agitator. (this is a new agitator....right ?) These loads are available from the agitator vendor.
The final reinforced tank/mixer roof should look like this:
(See Tank L-4 on this website)
http://www.centralfabricators.com/storagetanks.php
All of this equipment is new, right ? You are not trying to perform "junkyard process plant design" isn't that right ?
regards
-MJC
RE: Verify load on roof - API 650 tank
Removing the roof as suggested should be done only after verifying that the current tank cannot support the agitator adequately, that is why I am looking for ways to verify this.
For people with previous experience in similar situation, do you have a "feeling" of this tank been not sturdy enough for the loads I mentioned? I am still looking for a way to to the calculation to check this, though.
RE: Verify load on roof - API 650 tank
RE: Verify load on roof - API 650 tank
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-MJC
RE: Verify load on roof - API 650 tank