Major weldfuel explosions go through walls for no obvious reason

[Frank_Stein]

What they should do is direct all of the explosion in whatever open direction, so like it could fireball an entire hallway instead of just a section of it and parts of other rooms.

So say an average unimpeded welderbomb covers X tiles, it should look for X unimpeded / unwalled tiles in all directions- and then what? 
what if the room is 3x4 like in research, or that realyl narrow maint hall near robotics, which I think is probably the worst offender in this case. it'S a 1 or 2 wide strip with a tank by a window, and blowing it gets the main hall as well as sometimes a second tank inside robotics. 
not sure exactly what point im making, but there's a lot of very wierd positions for these things.

If you're asking what happens when a fire ball is supposed to take up 20 tiles or so, and there's only 7 tiles it can be on since it's blocked by doors and walls, I'd say either

1. Lengthen the time the fire burns by replacing tiles that burn out from the stock of unused fire tiles
2. Use the unused fire tiles to build the heat strength of the fire tiles near the fires start point
3. Keep the unused fire tiles on reserve for in case a new opening is made and then rapidly fill the area, for a backdraft like scenarios