Ducts around API tanks

[Weldinspect]

Hello friends, I am supervising the construction of an API 650 tank farm. Our contractor has installed electrical ducts around the tank bases at about 12" from the walls, I didn´t find it in the code, but we never saw them installed this way, any experience on it?

 

[Weldinspect]

Actually some of the ducts are only 2" separated from the tank walls

 

[IFRs]

What are the tanks storing, what are the ducts carrying, what classification is the dike area?

 

[Weldinspect]

There will be diesel and gasoline. The ducts are aluminum pipes for electrical control cables. Class 1 division 2.
Please see the picture attached on the right on top of the concrete ring you can see the electrical conduits.

 

[Weldinspect]

Two more pictures

 

[Weldinspect]

From AST forum:
Generally these are instrumentation and lighting - low voltage and amperage. It is common to locate these as shown in your pictures.
Thanks DavidR

 

[chicopee]

My two cents on terminology, these are electrical conduits, some a little bit flexible and some rigid--not ducts.

 

[Weldinspect]

Chicopee:
Thanks for the correctio, it is wellcome