Jan 22, 2012 #1 JAG11512 Mechanical Jan 21, 2012 7 How do I determine the slope of a self supported cone roof? Will it always be 2" in 12" or can it be different?
How do I determine the slope of a self supported cone roof? Will it always be 2" in 12" or can it be different?
Jan 22, 2012 #2 IFRs Petroleum Nov 22, 2002 4,658 It can be different and almost always is. Shallower slopes have thicker plates. You have to use good engineering judgement. Upvote 0 Downvote
It can be different and almost always is. Shallower slopes have thicker plates. You have to use good engineering judgement.
Jan 22, 2012 Thread starter #3 JAG11512 Mechanical Jan 21, 2012 7 Do you know of any books that go in depth on Storage tank roof designs? Thanks. Upvote 0 Downvote
Jan 22, 2012 #4 JStephen Mechanical Aug 25, 2004 8,626 API-650 includes a section for calculating thickness of self-supporting roofs; you work through it backwards to find the minimum slope. Note that API-12D, 12F, and UL-142 all have different slope requirements from API-650. Upvote 0 Downvote
API-650 includes a section for calculating thickness of self-supporting roofs; you work through it backwards to find the minimum slope. Note that API-12D, 12F, and UL-142 all have different slope requirements from API-650.
Jan 23, 2012 #5 LCeballos Mechanical Jan 19, 2012 29 I am agree with IFRs and JStepehen. Paragraph 5.10.5.1 says: "Self-supporting cone roofs shall conform to the following requirements: theta <= 37 degrees (slope = 9:12) theta >= 9.5 degrees (slope = 2:12)" Regards. Upvote 0 Downvote
I am agree with IFRs and JStepehen. Paragraph 5.10.5.1 says: "Self-supporting cone roofs shall conform to the following requirements: theta <= 37 degrees (slope = 9:12) theta >= 9.5 degrees (slope = 2:12)" Regards.
Jan 23, 2012 Thread starter #6 JAG11512 Mechanical Jan 21, 2012 7 Would this be the same for a tank thats 19ft dia. and 32ft high? If 2:12 is acceptable for this tank than thats what i would like to use. Upvote 0 Downvote
Would this be the same for a tank thats 19ft dia. and 32ft high? If 2:12 is acceptable for this tank than thats what i would like to use.
Jan 23, 2012 #7 IFRs Petroleum Nov 22, 2002 4,658 Depends on the thickness but I think you can stay under 1/2" (API max). Run the calcs and see! Upvote 0 Downvote
Jan 23, 2012 #8 Duwe6 Industrial Jul 27, 2010 2,189 2:12 at 19-ft should be in the neighborhood of 3/16 to 1/4" roof thickness. Upvote 0 Downvote
Jan 23, 2012 #9 IFRs Petroleum Nov 22, 2002 4,658 Depends on the loads but in general I'd agree that 3/16 to 1/4 would ordinarily do it for you. Upvote 0 Downvote
