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Self-Supported vs Supported cone roof

Monday, May 29, 2017   By: MPS [622] 1 Stars
Dears,

Can someone make me clear the difference between self-supported cone roof vs supported cone roof?

We have a 70 ft diameter tank with cone roof slope of 2:12, cone roof plate THK 5/16” and 36 numbers rafters L-Angle L7x4x0.5 located externally welded to roof plate.

Can we consider this geometry as self-supported cone roof tank per API650 5.10.5 OR this will be treated as supported cone roof tank per API650 5.10.4?

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Monday, May 29, 2017   By: davidr@fast.net [39] 5 Stars
This type of tank roof does not meet either definition in API 650. It falls into 5.10.2.8 Alternate Designs

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Monday, May 29, 2017   By: MPS [622] 1 Stars
Thanks David.

Is there any way to check the design is good or not?

Roof span can be checked per API650 5.10.4.4 for external loading and Roof THK can be checked per API650 F.6.1. for internal pressure.

Calculated Roof THK per API650 5.10.5.1 is very high, more than allowable limit of 0.5.

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Friday, June 02, 2017   By: MPS [622] 1 Stars
Can anyone please revert?

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Saturday, June 03, 2017   By: ITS [1678] 3 Stars
Well, that is a large diameter tank that is non-self supporting.

In essence, since there is no columns or center column supporting the tanks roof then is it is a self supporting conical roof. It is that simple.

We can all guess that your 70 foot diameter tank is older when API 12C was in place and good engineering.

Obviously the test of time has proven your tank self supporting conical roof to be a worthy or robust design. In those older days the self supporting conical roofs were generally did not exceed 60 feet, and when they do the compression ring is going to be very robust. Usually the self supporting conical roofs were 35 feet to 45 feet.

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