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Thanks.If girders are circumferential where is the support for girders?Do you mean the compression ring as girder? Can I use truss at roof instead of rafter at a slope of 3/32(.75 m height at centre)in case no column.

IFRs Thanks for your feedback.I misunderstood the section 3.10.4.4 which refer spacing of outer ring and inner ring. Is there any girder required to support rafters without colomn and if required how rafter and girder are arranged-slope to roof plate or horizontally? If with column,is there any...

I am designing a steel tank of supported cone roof without column which dia is 16 m and height 12m.According to API 650 this tank requires 2 rings of rafters. No. of outer rafters and inner rafters are 28 and 16 respectly.My question is how 2 rings of different types of rafters and girders are...