Condensation of isobutane from higher temp tank to lower temp tank

[DileepBendi]

We have a tank full of iso-butane at constant temp 58F is connected via pipe line to another tank(10K gal) maintained at 48F. We seen our tank volume increases from 75% to 80% this morning. Is it conceivable for 500 gal of vapor to transfer from first tank to second tank??

 

[dcasto]

if it took 12 hours, thats only 30,000 BTU/hr, not a big number.