Tank Bottom Slope
Tank Bottom Slope
(OP)
I have two questions.
1) I am looking for some information on hillside tank bottoms (ie sloping across the diameter of the tank). Can anyone provide some information with respect to the topics below.
a) What are some guidelines as to the largest practical tank diameter that can have a hillside bottom?
b) Can this style of tank bottom be used on concrete ring walls? How is the difference in elevation from side to side accounted for?
c) Any guidelines as to the maximum slope?
d) Any other issues with using a hillside tank bottom?
2) For cone up bottoms, can the slope be as large as 1:50 or 1:12? What are the issues with using this large of slope?
Thanks
1) I am looking for some information on hillside tank bottoms (ie sloping across the diameter of the tank). Can anyone provide some information with respect to the topics below.
a) What are some guidelines as to the largest practical tank diameter that can have a hillside bottom?
b) Can this style of tank bottom be used on concrete ring walls? How is the difference in elevation from side to side accounted for?
c) Any guidelines as to the maximum slope?
d) Any other issues with using a hillside tank bottom?
2) For cone up bottoms, can the slope be as large as 1:50 or 1:12? What are the issues with using this large of slope?
Thanks





RE: Tank Bottom Slope
RE: Tank Bottom Slope
In the book "Aboveground Storage tanks" by Myers, the three bottom configurations described are "single slope", "cone up" and "cone down". There is little discussion in this handbook of single slope tanks.
I have also have encountered these "single slope bottom" tanks.... but it was in the pulp-and-paper industry.
My recollection is that they were all smaller (shop-built)tanks.
The shell extended down to the floor (a continuous slab was used for support) and inside the tank the flat-bottom was sloped. When the tanks were installed, the space between the bottom and the supporting floor was carefully filled with grout (some holes had to be drilled for grout placement and venting.
In my opinion, only smaller diameter tanks should even consider these bottoms. I do not see how a large diameter tank with a ring wall can be constucted such that the bottom is fully supported.
Because of the odd shell-to-bottom joint configuration, I also do not believe such tanks can comply with API-650...
My opinion only.....
Anyone else have experience on this topic ?/
-MJC
RE: Tank Bottom Slope
RE: Tank Bottom Slope
RE: Tank Bottom Slope
RE: Tank Bottom Slope
RC ring wall not mandatory (API 650) but recommended for large tanks, the ring function is to stiffen the foundation area under the shell and to distribute load and deflection, the foundation being in any case an earth foundation ; refer to API 650 Appendix B for typical cross sections