API-650 Tanks - Limitations on non-annular plate bottom
API-650 Tanks - Limitations on non-annular plate bottom
(OP)
I need some information on API-650 tank designs with annular rings.
As I understand the rules, API 650 mandates an annular ring when the stress in the bottom course are above a certain level and higher strength materials are required in the shell. The Brittish standard (BS 2654) and many others mandate an annular ring when the tank is over a certain diameter (12.5m for BS 2654)
Is there anything wrong with an API-650 tank that is of large diameter (say 20-25m)that does not use the higher strength shell materials ?
Stated another way,when writing an API-650 design specification is it a good idea to mandate both the 12.5 m rule of the Brittish standard and REQUIRE an annular ring design ?
Thank you for your time
As I understand the rules, API 650 mandates an annular ring when the stress in the bottom course are above a certain level and higher strength materials are required in the shell. The Brittish standard (BS 2654) and many others mandate an annular ring when the tank is over a certain diameter (12.5m for BS 2654)
Is there anything wrong with an API-650 tank that is of large diameter (say 20-25m)that does not use the higher strength shell materials ?
Stated another way,when writing an API-650 design specification is it a good idea to mandate both the 12.5 m rule of the Brittish standard and REQUIRE an annular ring design ?
Thank you for your time





RE: API-650 Tanks - Limitations on non-annular plate bottom
RE: API-650 Tanks - Limitations on non-annular plate bottom
RE: API-650 Tanks - Limitations on non-annular plate bottom
We have used annular rings on smaller tanks i.e 12m in the past where the ring is the same thickness as the remainder of the floor just because it can be easier to fabricate, than the joggle detail.
The only reason I could see a tank of 12m diameter requiring an annular ring would be due to seismic uplift.