API650 Fixed Roof
API650 Fixed Roof
(OP)
I am in the process of designing a 15.5 mitr dia 15.8 dia steel tank with conical roof. I am bit stuck on the roof design and much appreciated some one could help me with this.
1) I am not clear either to go for self supporting or cone with rafter suppoerted from the tank wall, as i could not see any guideline in API 650 what type to be used based on diameter etc
2) when I look at the rafter spacing calculation , I am confued on the calulcation of uniform pressure which referes to Appendix R as i am not clear on what combination is should be used.
Any help would be much appreciated.
1) I am not clear either to go for self supporting or cone with rafter suppoerted from the tank wall, as i could not see any guideline in API 650 what type to be used based on diameter etc
2) when I look at the rafter spacing calculation , I am confued on the calulcation of uniform pressure which referes to Appendix R as i am not clear on what combination is should be used.
Any help would be much appreciated.





RE: API650 Fixed Roof
The load cases in Appendix R are all to be considered. The value that used in the design is the most severe of the load combinations.
RE: API650 Fixed Roof