I have a small tank for Vegetable or animal Oil 30 ft dia by 8 ft high need to know if 3/16 plate can be used? API 650 requires normally a minimum of .25 or 6mm is there a way out for an application that would be inside a building?
The new tank is going inside a building...( now wind and snow loads, no exterior corrosion)
and the tank is also sitting on a full concrete pad. API tanks are either on a concrete ring or on an earth slab.
If you refer to API 650, Appendix A. Go to table A-4b, it allows you to have a 3/16" shell course for a 30 ft diameter 1 shell course tank. Also refer to API 650 3.6.1.1. This refers you to smallest nominal plate thickness for a given diameter
30 foot diameter by 8 foot shell.......about 42,000 gallons
Yet...it is somehow indoors ???
This means that there are no columns within this building with at least 30 foot spans ?
Is this some kind of used vegetable oil storage tank located within a hockey rink ???
Why would you not want to break this volume up into two or three smaller tanks ? Perhaps two nice horizontal tanks, on saddles.... about 10-12 foot diameter ???
It's for inside Biodiesel. space is a limiting factor and we need to have the product in one tank...bio needs to be treated in a warmer space....and we have space for it
As stated above API-650 Appendix A will allow for a 3/16" shell and 1/4" bottom with no radiograpy. Depending on roof loads and internal pressure a 3/16" or 1/4" Domed Roof would work. If a domed roof is too tall, a conical roof is possible. But an unsupported conical roof with a 2:12 slope would have to be 0.455" thick, so a supported roof would be more practical.