Complete Drainage of Storage Tank
Complete Drainage of Storage Tank
(OP)
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
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





RE: Complete Drainage of Storage Tank
RE: Complete Drainage of Storage Tank
Cheers,
gr2vessels
RE: Complete Drainage of Storage Tank
I'm not too familiarized with the construction process, is the sump constructed during foundation or after foundation is done?
This I ask in order to tell Civil discipline to consider this or not and if it is in vendor's scope of supply
Thanks again for your help
RE: Complete Drainage of Storage Tank
It depends on the foundation type and how you design it. For example, if you have a full slab foundation, obviously you must install the sump with the slab. There are other factors as well.
RE: Complete Drainage of Storage Tank
This Tank has a concrete ringwall and compacted soil
RE: Complete Drainage of Storage Tank
Cheers,
gr2vessels