Domes for methanol tanks - venting as per API 650?
Domes for methanol tanks - venting as per API 650?
(OP)
We started a study to transform 200.000 barrels external floating roof oil tanks in fixed roof ( via aluminium dome )plus internal flating roof tank to contain methanol.
Dome venting design is being conducted as per API 650 in Roof vents 3.10.8
Once methanol has a much wider explosivity range ( from around 3 to 33 %) when compared to hydrocarbons generally stored in atmospheric tanks, questions are:
A- Are we using correct code for venting design?
B- What would be expected atmosphere mixture concentration in confined space under dome if using API code?
C- Does enyone have field experience, actual measurements of resulting methanol atmosphere concentration in similar tanks?
TIA
dkf
Dome venting design is being conducted as per API 650 in Roof vents 3.10.8
Once methanol has a much wider explosivity range ( from around 3 to 33 %) when compared to hydrocarbons generally stored in atmospheric tanks, questions are:
A- Are we using correct code for venting design?
B- What would be expected atmosphere mixture concentration in confined space under dome if using API code?
C- Does enyone have field experience, actual measurements of resulting methanol atmosphere concentration in similar tanks?
TIA
dkf





RE: Domes for methanol tanks - venting as per API 650?
Joe Tank
RE: Domes for methanol tanks - venting as per API 650?
We posed this question to Temcor local sales people and they claim that they do not have experience with methanol.
Other major dome manufacturer was already inquired,and did not answer the yet.
It seems to me that dome manufacturers do not care for that small details.
Does anybody know if venting is to keep atmosphere in the lean side or in the too rich side of explosive mixture?
Regards
dkf
RE: Domes for methanol tanks - venting as per API 650?
RE: Domes for methanol tanks - venting as per API 650?
Are any of mentioned tanks situated in tropical site?
Our yearly average temperatures are around 25°C peaking over 40°in summer. And days with no wind and high humidity are not uncommon.
Compared to gasoline tank would methanol vaporize more or less?
Regards
dkf
RE: Domes for methanol tanks - venting as per API 650?