Dome roof
Dome roof
(OP)
Hopefully tank experts can help me here. I'm not API designer (I use ASME and EN) but I got a project to check and thought I could learn something new in process.
A tank is API 650 19m diameter with dome roof. Dome roof as I can see has radial and circumferental structers (rafters and girders) though sketch is awful. I'm also reading API 650 and what I read it says: self supported cone roof and self supp.dome,umbrella roof and supported cone roof, nothing about supported dome roof? Am I missing something?
A tank is API 650 19m diameter with dome roof. Dome roof as I can see has radial and circumferental structers (rafters and girders) though sketch is awful. I'm also reading API 650 and what I read it says: self supported cone roof and self supp.dome,umbrella roof and supported cone roof, nothing about supported dome roof? Am I missing something?





RE: Dome roof
MJCronin
Sr. Process Engineer
RE: Dome roof
RE: Dome roof
RE: Dome roof
Design of Dome roof can be done manually, however nowadays most designers use FEM packages like ANSYS. if loads on roof are distributed evenly (or uneven distribution is not major), you can divide the the hypothetical sphere into equal wedges, minim one or two pair of rafters and their connecting girders and roof plate should be part of Model. Then analyze loads and stresses for this wedge. You can consider results with reasonable margin acceptable for the whole dome.
In case of special load on roof like big nozzles and uneven/undistributed piping loads or platform which are concentrated on specific points, whether a total model of roof with singular loads should be considered OR those specific points can be analyzed separately and results and conclusion to be combined with Wedge model. so, you may need some reinforcement for large nozzles or pedestal of platform, ...
RE: Dome roof