Get OUT of your chair.
Get INTO the building with a 25 foot (8 meter) tape measure!
Go WALK the building and SEE whether your load will run into anything.
Now, when do do the first three things, THEN start looking UP at heights (to ensure the tank will pass below and above ALL potential interferences.
Look at the heights of door and garage openings, electrical cables and pipes and crane rails and plumbing and fire lines and cable trays and equipment.
THEN look DOWN at the floor and concrete and find out how level it is, whether steps, ramps, offsets, inclines, or doorways will interfere with a simple roller or forklift.
Now, once you've done that, take a few pictures and post the results.
WHEN you have finished your homework, then walk through the path again but with a full-scale template (of 2x4's or light rods or bent rebar.... anything that will maintain its shape but let you carry it safely) . Double check your assumptions and triple check ALL "corners" where you will need to turn or twist the vessel. If you have height restrictions, make the template the right right height as well.