Counter Weight for crude oil storage tank

Two things come to mind:

1. They are referring to the counterweight installed in some types of rim seals for floating roofs:

OR

2. It is reference to the counterbalancing weight of the foundation (conrete, rimwalls, etc..) to resist uplift of the tank from wind and seismic moments.

Thanks for replying to comment my question.

For item no 1, it's clearly understood.

For item no.2 :

a. Is it some like anchoring bolt?

b. Or, is it concrete which is placed at inner side of the tank?

c. For calculating the weight of the concrete : the tank in the full of crude oil or the the tank in empty condition?

d. Please give me suggestion where the counterbalancing concrete will be placed (in drawing scetch).

Thank you

Dwi S

r u sure that u see that counter weight in 84mx 15m hgt tank. is there any problem in ur compartment box(leak)

i didnt see any counter weight in 79m x 18m crude tank

can u give design spec

material shell,plates for deck etc

Dear friends,

For a tank of 84.6m diameter and 15m height, there shall not be requirement of concrete ring wall foundation as there wo'nt be any anchorage requirement even with high seismic or wind loads.