arbitrader
Mechanical
- Nov 7, 2000
- 26
thread809-159697
I am looking for some guidance on 5.11.2.1 (API-650 13th Edition) regarding overturning.
Calculating OT resistance and sliding resistance for Wind, but need clarifiation on the Parameters M-DL, and M-DLR. The tank is a new 52'D x 32' open top tank that will have an aluminum geodome roof, and a steel internal floating roof. M-DL is defined as the OT moment from the weight of the shell and roof structure supported by the shell that is no attached to the roof plate., and M-DLR is the momenat of the roof plate plus any attached structural. I am not sure how these parameters are calculated for an aluminum geodome roof. Also, since this calculation is based upon an empty tank, can I take credit for the weight of the steel internal floating roof, since it would be sitting on its legs? The equations don't address this.
For sliding from wind, what is included in the weight that can be used to resist sliding, other than tank shell,roof, and floor? Can the steel internal floater also be included in this resisting load?
Finally, since this tank will be on a concrete ringwall, Can I use the maximum COF of 0.40 since the interface would be the concrete ring against steel, would likely be higher than sand to steel of the tank bottom, or sand to HDPE leak detection membrane.
I am looking for some guidance on 5.11.2.1 (API-650 13th Edition) regarding overturning.
Calculating OT resistance and sliding resistance for Wind, but need clarifiation on the Parameters M-DL, and M-DLR. The tank is a new 52'D x 32' open top tank that will have an aluminum geodome roof, and a steel internal floating roof. M-DL is defined as the OT moment from the weight of the shell and roof structure supported by the shell that is no attached to the roof plate., and M-DLR is the momenat of the roof plate plus any attached structural. I am not sure how these parameters are calculated for an aluminum geodome roof. Also, since this calculation is based upon an empty tank, can I take credit for the weight of the steel internal floating roof, since it would be sitting on its legs? The equations don't address this.
For sliding from wind, what is included in the weight that can be used to resist sliding, other than tank shell,roof, and floor? Can the steel internal floater also be included in this resisting load?
Finally, since this tank will be on a concrete ringwall, Can I use the maximum COF of 0.40 since the interface would be the concrete ring against steel, would likely be higher than sand to steel of the tank bottom, or sand to HDPE leak detection membrane.
