2 replies to this topic

[tabiscari]

Greetings
We are designing a Fuel Oil Tank
ID= 220 ft
H= 64 ft
Roof: Structurally supported cone roof
Bottom: Apex up, 1:120 slope (center is higher than periphery)

We are having a problem with the tank drainage:
The client request the complete drain of Tank in case of maintenance: to accomplish this, we suggested 4 draw-off sumps of 6" each nozzle.

1) How close can the sumps be between them?
As drainage lines are steam traced, they cannot be underground by Project Specs, given this situation, we have considered to gather all 4 drainage lines (and sumps) as close as possible not to interfere with other shell connection between drain nozzles

2) Is it possible to put more than one pipe inside a sump?

3) Table 5-16 of API 650 establishes NPS 6" as maximum, but paragraph 5.8.7 gives an open window to the purchaser, could be installed a single drain nozzle of 12"?

Thanks
 

[ankur2061]

tabiscari,

 

I do not have a specific answer to your query. But there are specific guidelines for tank bottom design. I am attaching those guidelines which provide a sketch for various tank bottom configurations and their advantages and disadvantages. The sketch is referenced from the design book for tanks of a reputed engineering and operating company.

 

Hope this helps.

 

Regards,

Ankur.

Attached Files

•  Bottom_Designs_for_Storage_Tanks.pdf   123.04KB   141 downloads

Thank you very much Mr. Ankur.